Plan clock
- Status
- Expired on 2025-12-13
- Plan
- Adams County, CO Hazard Mitigation Plan 2020 (FEMA plan 106805)
- Approved
- 2020-12-14
- Expires
- 2025-12-13
- As of
- 2026-09-28
- Days
- 289 days since expiry
- Update underway
- FEMA tracker shows a plan approvable pending adoption
Generally not eligible for FEMA mitigation project grants (HMGP, FMA) until a new plan is approved, barring a 44 CFR 201.6(a)(3) exception. Planning grants are not affected.
Not yet eligible: adopt the approved plan.
What changed since your last plan (approved 2020-12-14)
- New federal declarations
- none (0 declaration rows; 0 counted incidents)
- Storm Events records since approval
- 226 (data through 2026-06-30)
- Repetitive loss now
- FMA RL 0, SRL 1 (44 CFR 77.2); any definition: 6
- Repeat-flood change
- First release: no prior release to compare.
Sources
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
Plan status for every jurisdiction listed in this county
| Jurisdiction | Type | Status | Plan | Approved | Expires | Days to expirynegative = days since expiry | Update underway | Notes |
|---|---|---|---|---|---|---|---|---|
| Adams County | County | Expired on 2025-12-13 | Adams County, CO Hazard Mitigation Plan 2020 (FEMA plan 106805) | 2020-12-14 | 2025-12-13 | -289 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
| Arvada city | City | Approved, expires 2027-01-02 | Jefferson County, CO Hazard Mitigation Plan 2022 (FEMA plan 107676) | 2022-01-03 | 2027-01-02 | 96 | ||
| Aurora city | City | Approved, expires 2027-02-10 | City of Aurora Hazard Mitigation Plan 2021 (FEMA plan 107830) | 2022-02-11 | 2027-02-10 | 135 | ||
| Bennett town | Town | Expired on 2026-01-12 | Arapahoe County, CO Hazard Mitigation Plan 2021 (FEMA plan 107012) | 2021-01-13 | 2026-01-12 | -259 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
| Brighton city | City | Expired on 2025-12-13 | Adams County, CO Hazard Mitigation Plan 2020 (FEMA plan 106805) | 2020-12-14 | 2025-12-13 | -289 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
| Commerce City city | City | Expired on 2025-12-13 | Adams County, CO Hazard Mitigation Plan 2020 (FEMA plan 106805) | 2020-12-14 | 2025-12-13 | -289 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
| Federal Heights city | City | Approved, expires 2028-04-17 | Thornton, Federal Heights, Northglenn, CO Hazard Mitigation Plan 2023 (FEMA plan 108767) | 2023-04-18 | 2028-04-17 | 567 | ||
| Northglenn city | City | Approved, expires 2028-04-17 | Thornton, Federal Heights, Northglenn, CO Hazard Mitigation Plan 2023 (FEMA plan 108767) | 2023-04-18 | 2028-04-17 | 567 | ||
| Thornton city | City | Approved, expires 2028-04-17 | Thornton, Federal Heights, Northglenn, CO Hazard Mitigation Plan 2023 (FEMA plan 108767) | 2023-04-18 | 2028-04-17 | 567 | ||
| Westminster city | City | Approved, expires 2029-11-26 | City of Westminster, CO Hazard Mitigation Plan 2024 (FEMA plan 109401) | 2024-11-27 | 2029-11-26 | 1,155 | ||
| Denver Water | Water/Sewer Authority | Expired on 2025-12-13 | Adams County, CO Hazard Mitigation Plan 2020 (FEMA plan 106805) | 2020-12-14 | 2025-12-13 | -289 | FEMA tracker shows a plan approvable pending adoption | Not yet eligible: adopt the approved plan. |
Source
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
State plan status and tribal plans in this state: see the state page.
Supports B1-a: hazards
Hazards NRI does not cover: check locally
- dam failure (incl. upstream dams)
- levee failure
- flash flood as its own subtype
- ice jams
- debris flows
- erosion (riverine and coastal)
- land subsidence and sinkholes
- expansive soils
The 18 National Risk Index hazards, ranked by expected annual loss (EAL)
| Rank by EAL | Hazard | NRI risk rating | EAL rating | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | EAL population equivalencestatistical value of life and injury, $13.7M per life, not property damage | EAL total (see note)modeled dollars per year | Storm Events records since 1996count | Evidence for an omissionNRI Not Applicable, no declaration and no Storm Events record since 1996 | Storm Events coverage note |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Hail | Very High | Very High | $42,555,484 | $549,714 | $1,388,248 | $44,493,445 | 376 | ||
| 2 | Inland Flooding | Relatively Moderate | Relatively Moderate | $37,684,363 | $100,804 | $797,675 | $38,582,842 | 26 | ||
| 3 | Cold Wave | Relatively High | Very High | $49,952 | $159,527 | $21,186,822 | $21,396,301 | 11 | Includes 1 Frost/Freeze record, event types the NRI definition of this hazard leaves out. | |
| 4 | Tornado | Relatively High | Relatively High | $6,137,280 | $7,284 | $6,484,946 | $12,629,511 | 92 | ||
| 5 | Earthquake | Relatively Low | Relatively Moderate | $2,541,158 | $881,052 | $3,422,210 | Not in Storm Events. Storm Events coverage of this hazard is limited; absence is not evidence of low risk. | |||
| 6 | Lightning | Very High | Very High | $75,849 | $3,000,875 | $3,076,724 | 19 | |||
| 7 | Strong Wind | Relatively High | Relatively High | $823,714 | $12,652 | $2,136,094 | $2,972,461 | 203 | Includes 101 High Wind records and 6 Strong Wind records, event types the NRI definition of this hazard leaves out. | |
| 8 | Heat Wave | Relatively Low | Relatively Moderate | $344 | $3,447 | $1,667,177 | $1,670,968 | 5 | ||
| 9 | Winter Weather | Very High | Very High | $404,168 | under $1 | $994,841 | $1,399,009 | 218 | ||
| 10 | Wildfire | Relatively Low | Relatively Low | $516,725 | $258 | $54,217 | $571,200 | 2 | ||
| 11 | Drought | Relatively Low | Relatively Moderate | $469,938 | $469,938 | 5 | ||||
| 12 | Ice Storm | Relatively Moderate | Relatively Moderate | $111,046 | $66,574 | $177,619 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). | ||
| 13 | Landslide | Very Low | Very Low | $755 | $6 | $761 | 0 | Declared 2 times; no Storm Events record of this type. Storm Events coverage of this hazard is limited; absence is not evidence of low risk. | ||
| 14 | Volcanic Activity | Very Low | Very Low | under $1 | $123 | $123 | 0 | No recorded events in Storm Events since 1996 (data through 2026-06-30). Storm Events coverage of this hazard is limited; absence is not evidence of low risk. | ||
| Avalanche | Not Applicable | Not Applicable | 1 | NRI rates this Not Applicable, but 1 Storm Events record of this type exists since 1996; review before omitting. | ||||||
| Coastal Flooding | Not Applicable | Not Applicable | 0 | NRI rates coastal flooding Not Applicable for this county, and no federal declaration for this county names it. | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |||||
| Hurricane | Not Applicable | Not Applicable | 0 | NRI rates hurricane Not Applicable for this county, and no counted federal declaration for this county names it (EM-3224-CO names it but is not counted as a local occurrence; see B1-d). | No recorded events in Storm Events since 1996 (data through 2026-06-30). | |||||
| Tsunami | Not Applicable | Not Applicable | 0 | NRI rates tsunami Not Applicable for this county, and no federal declaration for this county names it. | No recorded events in Storm Events since 1996 (data through 2026-06-30). Storm Events coverage of this hazard is limited; absence is not evidence of low risk. |
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Check your state hazard mitigation plan's hazard list for this county; explain any hazard you drop.
Supports B1-b: location
Where each hazard occurs
| Hazard | Location | Census tracts ratedrated of all tracts |
|---|---|---|
| Avalanche | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 107 |
| Coastal Flooding | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 107 |
| Cold Wave | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Drought | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 54 of 107 |
| Earthquake | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 107 of 107 |
| Hail | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Heat Wave | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Hurricane | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 107 |
| Ice Storm | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Inland Flooding | The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county. | 107 of 107 |
| Landslide | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 106 of 107 |
| Lightning | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Strong Wind | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
| Tornado | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 107 of 107 |
| Tsunami | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 0 of 107 |
| Volcanic Activity | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 107 of 107 |
| Wildfire | Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet. | 95 of 107 |
| Winter Weather | Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally. | 107 of 107 |
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Supports B1-c: extent
Extent: scale, observed range and worst recorded event per hazard
| Hazard | Scale | Recordscount, years | Observed range | Worst recorded event | Most damaging (when different) | How it applies to members | Note |
|---|---|---|---|---|---|---|---|
| Avalanche | none (count and damage) | 1, 2015 to 2015 (1 zone-level) | No damage reported in 1 records. | Zone-level records: applies countywide; national data do not locate these events within the county. | Physical measure: in event narratives only; local data required. | ||
| Coastal Flood, Storm Surge/Tide | none in data (FIRM for depth) | 0 | Flood depth: see the FEMA Flood Insurance Rate Map. | ||||
| Cold/Wind Chill, Extreme Cold/Wind Chill | wind chill | 10, 1996 to 2025 (10 zone-level) | 1 day to 7 days (median 3 days); 8 with a recorded value | 7 consecutive days, 1998-12-18 to 1998-12-24, 3 direct deaths, zone-level | Zone-level records: applies countywide; national data do not locate these events within the county. | Wind chill: in event narratives only; local data required. | |
| Frost/Freeze (outside NRI Cold Wave definition) | crop damage | 1, 2014 to 2014 (1 zone-level) | Frost/Freeze, 2014-11-10, $10,000,000 crop damage, reported for the zone (2014 dollars); NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | Zone-level records: applies countywide; national data do not locate these events within the county. | Temperature: in event narratives only; local data required. | ||
| Drought | US Drought Monitor D-scale | 5, 2002 to 2021 (5 zone-level) | 22 days to 61 days (median 30.5 days); 4 with a recorded value | 61 days (2 months), 2021-11-01 to 2021-12-31, a run of 2 consecutive Storm Events drought records, zone-level | Zone-level records: applies countywide; national data do not locate these events within the county. | Storm Events enters a drought at D2 or worse east of the Rockies and D3 or worse from the Rockies west (NWS Instruction 10-1605); NRI drought counts D3 and D4 only. | |
| Earthquake | Modified Mercalli (local data) | 0 | No Storm Events record; local data required (e.g., USGS). | ||||
| Hail | hail size (inches) | 502, 1955 to 2026 | 0.5 in to 4.5 in (median 1 in); 502 with a recorded value | 4.5 in hail, 2011-07-13 | Event records naming member places: Bennett town (71 records), Brighton city (36 records), Northglenn city (36 records), Thornton city (30 records), Aurora city (25 records), Commerce City city (12 records), Westminster city (9 records). | ||
| Excessive Heat, Heat | heat index (narratives) | 5, 2000 to 2012 (5 zone-level) | 2 days to 30 days (median 17 days); 3 with a recorded value | 30 days, 2012-06-01 to 2012-06-30, from 1 monthly summary record (a monthly summary record covers most or all of a month; it does not count days at wave conditions), zone-level | Zone-level records: applies countywide; national data do not locate these events within the county. | Heat index: in event narratives only; local data required. | |
| Hurricane, Tropical Storm, Tropical Depression | Saffir-Simpson | 0 | Storm Events files every zone of a storm's episode under the storm's event type and category, so a Hurricane (Typhoon) record, especially an inland or remnant one, does not by itself mean hurricane-force winds here; read the damage and wind columns. | ||||
| Ice Storm | Sperry-Piltz (local data) | 0 | Ice thickness: in event narratives only; local data required. | ||||
| Flash Flood, Flood, Lakeshore Flood | damage and flood days (FIRM for depth) | 26, 1997 to 2025 | Flood, 2013-09-12, $2,140,000 property; $0 crops (2013 dollars) | Event records naming member places: Northglenn city (3 records), Westminster city (3 records), Aurora city (2 records), Commerce City city (2 records), Thornton city (2 records), Bennett town (1 record), Brighton city (1 record). | Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage can be $0 or blank even for a major flood, so the worst record here may not be the worst flood; compare FEMA Public Assistance by declaration in B1-d. | ||
| Debris Flow | none (count and damage) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Lightning | annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names) | 19, 1996 to 2011 | Lightning, 2006-06-21, property not reported; $0 crops (2006 dollars), 1 direct death | Lightning, 2001-07-11, $200,000 property; $0 crops (2001 dollars) | Event records naming member places: Westminster city (5 records), Brighton city (4 records), Commerce City city (3 records), Thornton city (3 records), Bennett town (2 records), Aurora city (1 record). | Storm Events lists lightning with damage or casualties; physical measure in event narratives only; local data required. | |
| High Wind and Strong Wind (outside NRI Strong Wind definition) | wind speed (kt and mph) | 107, 1996 to 2026 (107 zone-level) | 35 kt (40 mph) to 89 kt (102 mph) (median 55 kt (63 mph)); 105 with a recorded value | 89 kt (102 mph), measurement type not recorded, High Wind, 1999-02-02; NWS zone COZ040 (DENVER METROPOLITAN AREA), zone-level: may include parts of neighboring counties | High Wind, 1997-12-28, $120,000 property; $0 crops, reported for the zone (1997 dollars) | Zone-level records: applies countywide; national data do not locate these events within the county. | |
| Thunderstorm Wind | wind speed (kt and mph) | 135, 1958 to 2025 | 43 kt (49 mph) to 87 kt (100 mph) (median 55 kt (63 mph)); 119 with a recorded value | 87 kt (100 mph), measurement type not recorded, Thunderstorm Wind, 1983-10-02 | Thunderstorm Wind, 2000-05-26, $70,000 property; crops not reported (2000 dollars) | Event records naming member places: Bennett town (17 records), Brighton city (10 records), Northglenn city (7 records), Aurora city (6 records), Commerce City city (5 records), Westminster city (3 records), Thornton city (2 records). | |
| Tornado | Enhanced Fujita (F before Feb 2007) | 189, 1953 to 2025 | F/EF0 to F/EF3 (median F/EF0); 181 with a recorded value | F3 tornado, 1982-06-12, 3 mi path length (records before 1996 may include the whole path; rating and listing come from the county where the tornado began), 400 yd wide, $2,500 property; crops not recorded (1982 dollars) | Tornado, 1981-06-03, $25,000,000 property; crops not recorded (1981 dollars) | Event records naming member places: Bennett town (24 records), Brighton city (9 records), Aurora city (2 records), Commerce City city (1 record), Northglenn city (1 record), Westminster city (1 record). | From 1996 on, tornado records are per-county segments and length is the path length within this county (NWS Instruction 10-1605); records before 1996 may give the whole path length, including the path outside this county, and before 1996 a tornado is listed once, under the county where it began, with the whole path's rating; counties farther along the path may not list it. Length is not used to rank tornadoes. |
| Tsunami | none (count and damage) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Volcanic Ash, Volcanic Ashfall | Volcanic Explosivity Index (local data) | 0 | Physical measure: in event narratives only; local data required. | ||||
| Wildfire | acres burned (local data) | 2, 2024 to 2026 (2 zone-level) | Wildfire, 2024-07-13, $750,000 property; crops not reported, reported for the zone (2024 dollars); NWS zone COZ045 (C & E ADAMS & ARAPAHOE COUNTIES), zone-level: may include parts of neighboring counties | Zone-level records: applies countywide; national data do not locate these events within the county. | Acres burned: in event narratives only; local data required. | ||
| Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | none in data (snowfall local) | 218, 1996 to 2026 (218 zone-level) | Blizzard, 2003-03-17, $15,500,000 property; crops not reported, reported for the zone (2003 dollars), 2 direct injuries (reported for the zone); NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | Zone-level records: applies countywide; national data do not locate these events within the county. | Snow depth: in event narratives only; local data required. |
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records are placed with NWS zone-county files, which exist from 2020 on; an earlier record is placed by its zone number in the nearest later file only when its zone name matches that file, records from zones NWS renumbered are placed by name or left out, and a record whose zone is in no known file is left out of every count, so counts before 2020 can be low. Some current zones are also missing from the NWS files, so recent counts can be low too.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
Supports B1-d: previous occurrences
- Declaration rows
- 12
- Counted incidents
- 8
Federal disaster declarations for this county
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | County Public Assistancefederal share obligated, nominal dollars | Flags | Notes |
|---|---|---|---|---|---|---|---|---|
| 2020-03-28 | 2020-01-20 | DR-4498-CO | Major disaster | COVID-19 PANDEMIC | Non-natural, not counted | $7,136,658.64 | during plan review, check whether your last plan included it | |
| 2020-03-13 | 2020-01-20 | EM-3436-CO | Emergency | COVID-19 | Non-natural, not counted | none found | during plan review, check whether your last plan included it | same incident as DR-4498 |
| 2015-07-16 | 2015-05-04 | DR-4229-CO | Major disaster | SEVERE STORMS, TORNADOES, FLOODING, LANDSLIDES, AND MUDSLIDES | Inland Flooding (primary); also designated: Landslide, Tornado | $5,734,491.86 | ||
| 2013-09-14 | 2013-09-11 | DR-4145-CO | Major disaster | SEVERE STORMS, FLOODING, LANDSLIDES, AND MUDSLIDES | Inland Flooding (primary); also designated: Landslide | $4,293,427.22 | ||
| 2013-09-12 | 2013-09-11 | EM-3365-CO | Emergency | SEVERE STORMS, FLOODING, LANDSLIDES, AND MUDSLIDES | Inland Flooding (primary); also designated: Landslide | none found | same incident as DR-4145 | |
| 2007-01-07 | 2006-12-18 | EM-3270-CO | Emergency | SNOW | Winter Weather | $877,812.86 | ||
| 2005-09-05 | 2005-08-29 | EM-3224-CO | Emergency | HURRICANE KATRINA EVACUATION | Hurricane: evacuation support, not a local hazard event; not counted | none found | ||
| 2003-04-09 | 2003-03-17 | EM-3185-CO | Emergency | SNOW | Winter Weather | $511,284.02 | ||
| 2002-06-19 | 2002-04-23 | DR-1421-CO | Major disaster | WILDFIRES | Wildfire | PA not declared for this county | ||
| 1973-05-23 | 1973-05-23 | DR-385-CO | Major disaster | HEAVY RAINS, SNOWMELT AND FLOODING | Inland Flooding | none found | ||
| 1969-05-19 | 1969-05-19 | DR-261-CO | Major disaster | SEVERE STORMS & FLOODING | Inland Flooding | none found | ||
| 1965-06-19 | 1965-06-19 | DR-200-CO | Major disaster | TORNADOES, SEVERE STORMS & FLOODING | Tornado (primary); also designated: Inland Flooding | none found |
County Public Assistance: applicants the FEMA record places in this county, including any state agencies FEMA files there; statewide rows are listed on the state page; federal share obligated, nominal dollars.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Statewide declarations
| Declared | Incident began | FEMA number | Type | Title | Mapped hazard | Flags | Notes |
|---|---|---|---|---|---|---|---|
| 1956-06-12 | 1956-06-12 | DR-59-CO | Major disaster | FLOOD | Inland Flooding | ||
| 1955-05-25 | 1955-05-25 | DR-33-CO | Major disaster | FLOOD | Inland Flooding |
FEMA recorded these with designated area Statewide and no county. Listed on every county page in the state; not counted with county rows.
10 Fire Management declarations (1978-09-12 to 2016-07-10) FEMA filed as Statewide with no county; each names one local fire. Listed on the state page.
Source
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
Previous occurrences by hazard, with explicit no-event rows
| Hazard | Storm Events recordsfull period | Since plan approvalrecords | During plan reviewrecords | Last 5 yearsrecords | Declared incidentsdistinct incidents | Declared since approvaldistinct incidents | Period | Statement |
|---|---|---|---|---|---|---|---|---|
| Avalanche | 1 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Coastal Flooding | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Cold Wave | 11 | 4 | 0 | 4 | 0 | 0 | 1996 to 2026-06-30 | Includes 1 Frost/Freeze record, event types the NRI definition of this hazard leaves out. |
| Drought | 5 | 2 | 0 | 2 | 0 | 0 | 1996 to 2026-06-30 | |
| Earthquake | 0 | 0 | 0 | 0 | 0 | 0 | No Storm Events record; local data required (e.g., USGS). | |
| Hail | 502 | 104 | 6 | 88 | 0 | 0 | 1955 to 2026-06-30 | |
| Heat Wave | 5 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Hurricane | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Ice Storm | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Inland Flooding | 26 | 4 | 0 | 4 | 5 | 0 | 1996 to 2026-06-30 | |
| Landslide | 0 | 0 | 0 | 0 | 2 | 0 | 1996 to 2026-06-30 | No Storm Events records of this type; 2 federal declared incidents (see declarations table) |
| Lightning | 19 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | |
| Strong Wind | 242 | 42 | 25 | 38 | 0 | 0 | 1955 to 2026-06-30 | Includes 101 High Wind records and 6 Strong Wind records, event types the NRI definition of this hazard leaves out. |
| Tornado | 189 | 14 | 0 | 10 | 2 | 0 | 1950 to 2026-06-30 | |
| Tsunami | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Volcanic Activity | 0 | 0 | 0 | 0 | 0 | 0 | 1996 to 2026-06-30 | No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events |
| Wildfire | 2 | 2 | 0 | 2 | 1 | 0 | 1996 to 2026-06-30 | |
| Winter Weather | 218 | 54 | 8 | 47 | 2 | 0 | 1996 to 2026-06-30 |
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
Notable Storm Events records
| Date | Event type | Magnitude or extent | Damagenominal dollars | Direct deaths, injuriesindirect not counted | Location | Flags | Why listed |
|---|---|---|---|---|---|---|---|
| 2024-07-13 | Wildfire | $750,000 property; crops not reported, reported for the zone (2024 dollars) | 0, 0 | NWS zone COZ045 (C & E ADAMS & ARAPAHOE COUNTIES), zone-level: may include parts of neighboring counties | new since last plan; within last 5 years | B1-c worst recorded: Wildfire | |
| 2022-12-21 | Cold/Wind Chill | damage not reported | 1, 0 | NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | new since last plan; within last 5 years | deaths or injuries recorded | |
| 2014-11-10 | Frost/Freeze | property not reported; $10,000,000 crops, reported for the zone (2014 dollars) | 0, 0 | NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | B1-c worst recorded: Frost/Freeze (outside NRI Cold Wave definition) | ||
| 2013-09-12 | Flood | $2,140,000 property; $0 crops (2013 dollars) | 0, 0 | BARR LAKE to NORTHGLENN | B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood | ||
| 2012-06-01 | Heat | $0 property; $0 crops, reported for the zone (2012 dollars) | 0, 0 | NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | B1-c worst recorded: Excessive Heat, Heat | ||
| 2011-07-13 | Hail | 4.5 in | $164,800,000 property; crops not reported (2011 dollars) | 0, 2 | WATKINS | B1-c worst recorded: Hail | |
| 2006-06-21 | Lightning | property not reported; $0 crops (2006 dollars) | 1, 0 | WESTMINSTER | deaths or injuries recorded | ||
| 2003-03-17 | Blizzard | $15,500,000 property; crops not reported, reported for the zone (2003 dollars) | 0, 2 | NWS zone COZ040 (N DOUGLAS COUNTY BELOW 6000 FEET / DENVER / W ADAMS & ARAPAHOE COUNTIES / E BROOMFIELD COUNTY), zone-level: may include parts of neighboring counties | B1-c worst recorded: Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet | ||
| 1999-02-02 | High Wind | 89 kt (102 mph), measurement type not recorded | damage not reported | 0, 0 | NWS zone COZ040 (DENVER METROPOLITAN AREA), zone-level: may include parts of neighboring counties | B1-c worst recorded: High Wind and Strong Wind (outside NRI Strong Wind definition) | |
| 1998-12-18 | Cold/Wind Chill | property not reported; $0 crops, reported for the zone (1998 dollars) | 3, 15 | NWS zone COZ040 (DENVER METROPOLITAN AREA), zone-level: may include parts of neighboring counties | deaths or injuries recorded | ||
| 1983-10-02 | Thunderstorm Wind | 87 kt (100 mph), measurement type not recorded | damage not recorded (pre-1996 record) | 0, 0 | location not recorded | B1-c worst recorded: Thunderstorm Wind | |
| 1982-06-12 | Tornado | F3, 3 mi path length (records before 1996 may include the whole path; rating and listing come from the county where the tornado began), 400 yd wide | $2,500 property; crops not recorded (1982 dollars) | 0, 0 | location not recorded | B1-c worst recorded: Tornado |
The full list is in the XLSX file, sheet "B1-d Storm Events history" (1,220 rows).
Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records are placed with NWS zone-county files, which exist from 2020 on; an earlier record is placed by its zone number in the nearest later file only when its zone name matches that file, records from zones NWS renumbered are placed by name or left out, and a record whose zone is in no known file is left out of every count, so counts before 2020 can be low. Some current zones are also missing from the NWS files, so recent counts can be low too.
Sources
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
State-declared emergencies are not in federal data. Add them from your state emergency management agency.
Tribal and special-area declarations in this state are listed on the state page.
Supports B1-e: probability
Probability: FEMA annualized frequency and descriptor per hazard
| Hazard | FEMA annualized frequency (modeled)unit per row | Unit | In plain terms | Descriptor | Descriptor basis | NRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional) | NRI period | Location | Note |
|---|---|---|---|---|---|---|---|---|---|
| Avalanche | events per year | 1994 to 2023 (30 years) | see B1-f | Not Applicable in NRI for this county; no descriptor. | |||||
| Coastal Flooding | events per year at a location (modeled) | not shown | modeled | see B1-f | Not Applicable in NRI for this county; no descriptor. | ||||
| Cold Wave | 1.61 | event-days per year | about 1.61 days per year | Likely | event-days in 8 of 30 years, 1996 to 2025 (26.7%) | 30.5 | 2005-11-12 to 2024-11-12 (19 years) | countywide | NRI gives about 1.61 cold wave event-days a year here (its annualized frequency over 19 years; not its event count divided by the years), but Storm Events has a record in only 8 of 30 years. NRI counts from a different source that records far more events than Storm Events, so this descriptor reads much lower than NRI's frequency; read the two together. Frost/Freeze records are not counted in this descriptor: they record crop freezes, not cold waves. |
| Drought | 25.6 | event-days per year | about 25.6 days per year | Likely | event-days in 3 of 30 years, 1996 to 2025 (10%) | 798 | 2000 to 2025 (25.25 years; D3 and D4 only) | countywide | NRI gives about 25.6 drought event-days a year here (its annualized frequency over 25.25 years; not its event count divided by the years), but Storm Events has a record in only 3 of 30 years. NRI counts from a different source that records far more events than Storm Events, so this descriptor reads much lower than NRI's frequency; read the two together. |
| Earthquake | 0.000671 | annual probability at a location | chance a given location in the county has at least minor-damage shaking in a year: 0.0671% | not shown | modeled | see B1-f | Descriptor not assigned: the NRI value is the chance at a location in the county, not how often the hazard affects the county, and Storm Events does not record earthquakes. | ||
| Hail | 8.16 | events per year | about 8.16 per year | Highly likely | FEMA annualized frequency (modeled) | 310.0 (modeled) | 1986 to 2023 (38 years) | countywide | |
| Heat Wave | 0.76 | event-days per year | about 0.76 days per year | Possible | event-days in 2 of 30 years, 1996 to 2025 (6.67%) | 11.4 | 2005-11-12 to 2024-11-12 (19 years) | countywide | |
| Hurricane | events per year | 1851 to 2024 (Atlantic) | see B1-f | Not Applicable in NRI for this county; no descriptor. | |||||
| Ice Storm | 0.0263 | event-days per year | about 0.0263 days per year | event-days in 0 of 30 years, 1996 to 2025 (0%) | 2 | 1946-12-31 to 2014-02-12 (67 years) | countywide | No recorded event-days, 1996 to 2025; descriptor not assigned | |
| Inland Flooding | 0.643 | event-days per year | about 0.643 days per year | Likely | event-days in 13 of 30 years, 1996 to 2025 (43.3%) | 18 | 1996 to 2023 (28 years) | see B1-f | |
| Landslide | 0.157 | events per year (modeled) | about 1 in 6 years | Likely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Lightning | 49.9 | days per year with a strike | about 49.9 days per year | Highly likely | FEMA annualized frequency (modeled) | not shown | 1995 to 2023 (29 years; CONUS) | countywide | |
| Strong Wind | 1.45 | events per year | about 1.45 per year | Highly likely | FEMA annualized frequency (modeled) | 56 | 1986 to 2023 (38 years) | countywide | |
| Tornado | 1.53 | events per year | about 1.53 per year | Highly likely | FEMA annualized frequency (modeled) | not shown | 1950 to 2023 (EF2+); 1986 to 2023 (EF0-1) | see B1-f | |
| Tsunami | annual probability at the most exposed location (used in place of a county value) | not shown | modeled | see B1-f | Not Applicable in NRI for this county; no descriptor. | ||||
| Volcanic Activity | 0.0001 | annual probability | about 1 in 10,000 years | Unlikely | FEMA annualized frequency (modeled) | not shown | modeled | see B1-f | |
| Wildfire | 0.00119 | annual probability at a location | chance a given location in the county burns in a year: 0.119% | Possible | Storm Events records in 1 of 30 years, 1996 to 2025 (3.33%) | not shown | modeled | see B1-f | Descriptor from Storm Events, not NRI: the NRI value is the chance at a location in the county, not how often the hazard affects the county. |
| Winter Weather | 12.4 | event-days per year | about 12.4 days per year | Highly likely | event-days in 30 of 30 years, 1996 to 2025 (100%) | 236 | 2005-11-12 to 2024-11-12 (19 years) | countywide |
FEMA annualized frequency (modeled) comes from the National Risk Index v1.20 (December 2025). It is not recorded events divided by years, and what it measures depends on the hazard. For most hazards it estimates how often the hazard affects this county each year: it counts events or event-days (drought, heat wave, cold wave, winter weather, ice storm and inland flooding are in days per year; lightning is the number of days per year with a recorded cloud-to-ground strike, from the NOAA Storm Prediction Center daily lightning climatology); it may count events in the surrounding area (hail, strong wind, tornado, hurricane and ice storm use a 49 km grid and buffers) and is averaged over the county's area; and some hazards use a minimum value for places with no recorded event. Earthquake, wildfire and coastal flooding are different: FEMA computes them for each census block and averages them over the county, so the value is the chance (for coastal flooding, the modeled number of floods per year) at a location in the county, which is lower than the chance that the hazard strikes somewhere in the county. Earthquake is the chance of at least minor-damage shaking (U.S. Geological Survey model); wildfire is the chance that a location burns in a large fire (U.S. Forest Service burn probability); coastal flooding comes from FEMA flood zones and NOAA high-tide flooding, so it can be above 1 where high-tide flooding is frequent. Tsunami is the value at the county's most exposed location, from recorded events and modeled return periods. For these four hazards the packet gives no "1 in N years" and takes the descriptor from Storm Events (none for earthquake) unless the value is 1 or more a year. Landslide is a U.S. Geological Survey modeled county rate spread by slope susceptibility. Volcanic activity is the chance that a volcano affecting the county erupts in a year. Drought counts only extreme and exceptional drought (D3 and D4). Source: FEMA, National Risk Index Technical Documentation v1.20, sections 5.2.2 (Table 5), 5.2.3, 7.4, 10.4, 16.5, 17.1, 17.3.1, 17.5, 20.3.1, 21.4, 22.4 and 6 to 23.
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Descriptor scale used in this packet (defined per unit)
| Unit | Descriptor | Definition |
|---|---|---|
| events per year | Highly likely | 1 or more per year |
| events per year | Likely | about once in 1 to 10 years |
| events per year | Possible | about once in 10 to 100 years |
| events per year | Unlikely | less than once in 100 years |
| annual probability | Likely | 10% to under 100% chance in a given year |
| annual probability | Possible | 1% to under 10% chance in a given year |
| annual probability | Unlikely | under 1% chance in a given year |
| event-days (share of years) | Highly likely | event-days recorded in 90% or more of years |
| event-days (share of years) | Likely | event-days recorded in 10% to under 90% of years |
| event-days (share of years) | Possible | event-days recorded in some years but under 10% of years |
| lightning strike-days | Highly likely | cloud-to-ground strikes on 1 or more days per year |
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Intensity bands: historical frequency (Storm Events)
| Hazard | Band | Years | Eventscounty-coded records | Years in period | Events per yearevents / years |
|---|---|---|---|---|---|
| Hail | 1.00-1.99 in | 1996 to 2025 | 236 | 30 | 7.87 |
| Hail | 2.00 in+ | 1996 to 2025 | 30 | 30 | 1 |
| Strong Wind (Thunderstorm Wind records) | 50-64 kt | 1996 to 2025 | 82 | 30 | 2.73 |
| Strong Wind (Thunderstorm Wind records) | 65 kt+ | 1996 to 2025 | 10 | 30 | 0.333 |
| Strong Wind (Thunderstorm Wind records) | unmeasured or below 50 kt | 1996 to 2025 | 4 | 30 | 0.133 |
| Tornado | EF0-1 | 1996 to 2025 | 84 | 30 | 2.8 |
| Tornado | EF2-3 | 1996 to 2025 | 2 | 30 | 0.0667 |
| Tornado | EF4-5 | 1996 to 2025 | 0 | 30 | 0 |
| Tornado | unrated (EFU) | 1996 to 2025 | 6 | 30 | 0.2 |
Hail smaller than 1 inch is not counted: on 2010-01-05 the National Weather Service raised its severe-hail threshold from 3/4 inch to 1 inch, so smaller reports became less common after 2009 (NWS Service Change Notice 09-52). NRI hail frequency uses a 0.75 inch threshold.
Source
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Optional: future conditions. Not a required item in the 2025 FEMA Local Mitigation Planning Policy Guide; some states ask for it. The federal Climate Mapping for Resilience and Adaptation (CMRA) site gives county exposure to future climate conditions.
Supports B1-f: variation across the planning area
Range of census tract risk within the county
| Hazard | Tractsrated of all | Risk score minNRI score, 0 to 100 | Median | Max | Tracts by rating | Note |
|---|---|---|---|---|---|---|
| Avalanche | 0 of 107 | Not Applicable 107 | ||||
| Coastal Flooding | 0 of 107 | Not Applicable 107 | ||||
| Cold Wave | 107 of 107 | 16.8 | 80.4 | 93.8 | Relatively High 67, Relatively Moderate 38, Relatively Low 1, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Drought | 54 of 107 | 67.2 | 72.9 | 98.0 | Relatively High 1, Relatively Moderate 1, Relatively Low 4, Very Low 48, No Rating 53 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range above mostly reflects where crop and livestock value is, not where buildings and people are. Confirm locally. |
| Earthquake | 107 of 107 | 12.6 | 41.8 | 74.6 | Relatively Low 55, Very Low 52 | |
| Hail | 107 of 107 | 87.4 | 98.0 | 99.9 | Very High 51, Relatively High 54, Relatively Moderate 2 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Heat Wave | 107 of 107 | 1.7 | 19.5 | 44.7 | Relatively Low 66, Very Low 41 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Hurricane | 0 of 107 | Not Applicable 107 | ||||
| Ice Storm | 107 of 107 | 2.2 | 18.6 | 52.9 | Relatively Low 8, Very Low 99 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Inland Flooding | 107 of 107 | 0.5 | 16.6 | 86.3 | Relatively High 1, Relatively Moderate 11, Relatively Low 47, Very Low 48 | |
| Landslide | 106 of 107 | 10.9 | 38.3 | 85.0 | Relatively Low 1, Very Low 105, No Rating 1 | |
| Lightning | 107 of 107 | 0.6 | 76.6 | 94.9 | Relatively High 46, Relatively Moderate 54, Relatively Low 6, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Strong Wind | 107 of 107 | 10.9 | 61.8 | 81.8 | Relatively Moderate 75, Relatively Low 31, Very Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
| Tornado | 107 of 107 | 21.7 | 59.8 | 81.1 | Relatively High 4, Relatively Moderate 75, Relatively Low 27, Very Low 1 | |
| Tsunami | 0 of 107 | Not Applicable 107 | ||||
| Volcanic Activity | 107 of 107 | 40.2 | 62.3 | 76.7 | Very Low 107 | |
| Wildfire | 95 of 107 | 18.6 | 54.4 | 95.4 | Relatively Moderate 5, Relatively Low 28, Very Low 62, No Rating 12 | |
| Winter Weather | 107 of 107 | 26.0 | 85.1 | 94.6 | Relatively High 80, Relatively Moderate 26, Relatively Low 1 | National data give a county-wide or coarse (49 km grid or NWS zone) frequency for this hazard, so they cannot show members' hazard differing. The tract range above mostly reflects where buildings and people are. Confirm locally. |
Rated tracts only: No Rating (score 0.0), Not Applicable and Insufficient Data tracts are counted but not used for the minimum, median and maximum.
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Per-member block (Starter, confirm locally)
| Member | Type | Plan status | Repetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definition | Public Assistance matchedfederal share obligated, nominal dollars | Event records naming this placeall years; since the member's plan | Notes |
|---|---|---|---|---|---|---|
| Adams County | County | Expired on 2025-12-13 | FMA RL 0, SRL 0; any 2 | $1,973,737.62 | 0; 0 | |
| Arvada city | City | Approved, expires 2027-01-02 | FMA RL 0, SRL 0; any 1 | none found | 0; 0 | Whole community, including the part in Jefferson County; none of its repeat-flood properties are in this county. |
| Aurora city | City | Approved, expires 2027-02-10 | FMA RL 0, SRL 0; any 3 | none found | 36; 16 | Whole community, including the part in Arapahoe County; in-county portion (county table): FMA RL 0, FMA SRL 0, NFIP RL 1, NFIP SRL 0, any category 1. |
| Bennett town | Town | Expired on 2026-01-12 | FMA RL 0, SRL 0; any 0 | $4,063.50 | 115; 15 | |
| Brighton city | City | Expired on 2025-12-13 | FMA RL 0, SRL 0; any 0 | $664,941.60 | 60; 4 | |
| Commerce City city | City | Expired on 2025-12-13 | FMA RL 0, SRL 0; any 0 | $801,957.47 | 23; 3 | |
| Federal Heights city | City | Approved, expires 2028-04-17 | FMA RL 0, SRL 0; any 0 | $17,871.18 | 0; 0 | |
| Northglenn city | City | Approved, expires 2028-04-17 | FMA RL 0, SRL 0; any 0 | $67,321.18 | 47; 16 | |
| Thornton city | City | Approved, expires 2028-04-17 | FMA RL 0, SRL 0; any 1 | $8,585,220.83 | 37; 10 | Includes $2,320,533.98 for declarations not counted as hazard incidents (DR-4498-CO). |
| Westminster city | City | Approved, expires 2029-11-26 | FMA RL 0, SRL 1; any 2 | $219,262.53 | 21; 2 |
Member rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each member row, while the county table counts only its part in this county.
School districts and special districts get a plan clock row only.
Sources
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
Supports B2-a and B2-b: assets and impacts
Local data required
County-level starter. The plan must describe impacts for each participant and its own assets.
- Critical facilities and lifelines per hazard
- A problem statement per participant per hazard
- Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
- Future assets
County-level starter: exposure, expected annual loss and damage since the plan
| Hazard | Building exposuremodeled dollars | Agriculture exposuremodeled dollars | Population exposedpeople | EAL buildingsmodeled dollars per year | EAL agriculturemodeled dollars per year | EAL population equivalencestatistical value of life and injury, $13.7M per life, not property damage | EAL as % of exposurebuildings; agriculture where noted | Storm Events damage since 2020-12-14county-coded records, property plus crops, nominal dollars | Zone-level damage since planproperty plus crops, reported for the zone | Public Assistance since plannominal dollars; see note | Note |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Avalanche | Not Applicable in NRI for this county | ||||||||||
| Coastal Flooding | Not Applicable in NRI for this county | ||||||||||
| Cold Wave | $90,326,747,640 | $162,805,939 | 519,291 | $49,952 | $159,527 | $21,186,822 | under 0.0001% | $0 | |||
| Drought | $91,840,086 | $469,938 | 0.512% (agriculture) | NRI has no building exposure for this hazard; agriculture shown | |||||||
| Earthquake | $156,081,649,672 | 519,572 | $2,541,158 | $881,052 | 0.00163% | ||||||
| Hail | $90,326,747,640 | $162,805,939 | 519,291 | $42,555,484 | $549,714 | $1,388,248 | 0.0471% | $0 | |||
| Heat Wave | $90,326,747,640 | $162,805,939 | 519,291 | $344 | $3,447 | $1,667,177 | under 0.0001% | ||||
| Hurricane | Not Applicable in NRI for this county | ||||||||||
| Ice Storm | $90,326,747,640 | 519,291 | $111,046 | $66,574 | 0.000123% | ||||||
| Inland Flooding | $90,226,849,975 | $6,050,070 | 3,439 | $37,684,363 | $100,804 | $797,675 | n/a (see note) | $1,300,000 | NRI counts the full building value of any census block with some flood loss; this is not the value of buildings in the floodplain. Use local FIRM overlays for B2-a/B2-b. EAL as % of exposure: n/a. | ||
| Landslide | $506,266,186 | 2,717 | $755 | $6 | 0.000149% | ||||||
| Lightning | $90,326,747,640 | 519,291 | $75,849 | $3,000,875 | under 0.0001% | ||||||
| Strong Wind | $90,326,747,640 | $162,805,939 | 519,291 | $823,714 | $12,652 | $2,136,094 | 0.000912% | $1,000 | $0 | ||
| Tornado | $90,326,747,640 | $162,805,939 | 519,291 | $6,137,280 | $7,284 | $6,484,946 | 0.00679% | $0 | |||
| Tsunami | Not Applicable in NRI for this county | ||||||||||
| Volcanic Activity | $90,326,747,640 | 519,291 | under $1 | $123 | under 0.0001% | ||||||
| Wildfire | $6,133,547,649 | $76,649,926 | 45,767 | $516,725 | $258 | $54,217 | 0.00842% | $750,000 | |||
| Winter Weather | $90,326,747,640 | $162,805,939 | 519,291 | $404,168 | under $1 | $994,841 | 0.000447% | $0 |
Totals since 2020-12-14 (Storm Events through 2026-06-30): 144 county-coded records, 25 with a damage value recorded (including $0), $1,301,000; 82 zone-level records, 34 with a damage value recorded (including $0), $750,000 reported for the zone; Public Assistance on counted declarations none found (0 declarations, 0 with PA).
Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).
FEMA does not split Public Assistance by hazard. A declaration mapped to several hazards is listed under each of them with its full amount, so the per-hazard column must not be added up; the unit total counts each declaration once.
Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.
Sources
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Supports B2-a: context
County context
| Measure | Value |
|---|---|
| Population | 519,291 |
| Building value (total, not at risk) | $90,326,747,640 |
| Agriculture value (total, not at risk) | $162,805,939 |
| NRI risk rating (all hazards) | Relatively Moderate |
| Expected annual loss, buildings and agriculture, all hazards | $92,204,462 |
| Expected annual loss, population equivalence, all hazards (NRI values each statistical life at $13.7M; a modeled value of expected deaths and injuries, not property damage) | $38,658,651 |
| Social vulnerability rating | Very Low |
| Community resilience rating | Relatively Moderate |
| NRI version | December 2025 |
FEMA's all-hazard expected annual loss total adds buildings, agriculture and population equivalence; the two parts are shown separately so the property figure is not read as including the statistical value of life.
Source
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
Supports B2-c: repetitive loss
Repetitive loss in this county, both definitions
| Definition | Properties | Severe repetitive loss | Properties |
|---|---|---|---|
| Repetitive loss, FMA definition (44 CFR 77.2) | 0 | Severe repetitive loss, FMA definition (44 CFR 77.2) | 1 |
| Repetitive loss, NFIP insurance definition | 5 | Severe repetitive loss, NFIP insurance definition | 0 |
Your state NFIP coordinator's list may use the NFIP insurance definition, so its counts can be higher.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Repeat-flood properties: county and state-level rows
| Scope | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| County total | 0 | 1 | 5 | 0 | 6 | 0 | 1 |
| ADAMS COUNTY * | 0 | 0 | 2 | 0 | 2 | 0 | 1 |
| AURORA, CITY OF | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| THORNTON, CITY OF | 0 | 0 | 1 | 0 | 1 | 0 | 0 |
| WESTMINSTER, CITY OF | 0 | 1 | 1 | 0 | 2 | 0 | 0 |
| State level, not in this county: county not reported | 0 | 0 | 8 | 0 | 8 | 0 | 0 |
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
Repeat-flood properties by plan member (NFIP community)
| Member | NFIP community ID | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties | Note |
|---|---|---|---|---|---|---|---|---|---|
| Adams County | 080001 | 0 | 0 | 2 | 0 | 2 | 0 | 1 | |
| Arvada city | 085072 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | Whole community, including the part in Jefferson County; none of its repeat-flood properties are in this county. |
| Aurora city | 080002 | 0 | 0 | 3 | 0 | 3 | 0 | 1 | Whole community, including the part in Arapahoe County; in-county portion (county table): FMA RL 0, FMA SRL 0, NFIP RL 1, NFIP SRL 0, any category 1. |
| Bennett town | 080003 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Brighton city | 080004 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Commerce City city | 080006 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Federal Heights city | 080240 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Northglenn city | 080257 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Thornton city | 080007 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | |
| Westminster city | 080008 | 0 | 1 | 1 | 0 | 2 | 0 | 0 |
Per-member types: XLSX sheet 'B2-c Members'.
Member rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each member row, while the county table counts only its part in this county.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
County repeat-flood properties by occupancy group
| Occupancy group | RL, FMAproperties | SRL, FMAproperties | RL, NFIPproperties | SRL, NFIPproperties | Any categoryproperties | Mitigatedproperties | Currently insuredproperties |
|---|---|---|---|---|---|---|---|
| single-family residential | 0 | 0 | 4 | 0 | 4 | 0 | 1 |
| 2 to 4 unit residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| other residential | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| non-residential | 0 | 1 | 1 | 0 | 2 | 0 | 0 |
| not reported | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Institutional properties cannot be separated in this data: FEMA's occupancy groups have no institutional class, so they fall in non-residential or other residential in the table by occupancy group.
Sources
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FMA RL and FMA SRL are the Flood Mitigation Assistance definitions (44 CFR 77.2), the ones the FEMA Local Mitigation Planning Policy Guide cites; OpenFEMA's fmaRl field description omits the Increased Cost of Compliance clause of 44 CFR 77.2(i). NFIP repetitive loss (FEMA insurance definition, nfipRl) is 2 or more claims over $1,000 in 10 years and can drop to false when a property is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured.
Your state NFIP coordinator's list may use the NFIP insurance definition, so its counts can be higher.
Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (as of 2026-08-02). No property is identified. County assignment is FEMA's geocode.
Counts may differ from your state NFIP coordinator's list, which is the source the Handbook names.
In this county 0 properties are FMA repetitive loss but not NFIP repetitive loss, and 5 properties are NFIP repetitive loss but not FMA repetitive loss.
Exact counts; no count suppression.
Sources
Every table above lists its own sources. The full list, for the plan's bibliography (FEMA review item A4-a):
- FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-26T121003Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
- FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-27T010817Z, pulled 2026-09-28, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
- FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-26T151157Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
- FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-28, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
- FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-28, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
- NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-28, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
- NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-28, https://www.weather.gov/gis/ZoneCounty
- U.S. Census Bureau, Census 2024 Gazetteer, 2020 place by county, CT county-to-cousub crosswalk, version 2024-gazetteer, pulled 2026-09-28, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_counties_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_cousubs_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_place_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_unsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_elsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_scsd_national.zip, https://www2.census.gov/geo/docs/reference/codes2020/national_place_by_county2020.txt, https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.xlsx
OpenFEMA disclaimer
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Hazard Plain is an independent product built from public federal data. It is not a FEMA document and is not reviewed or endorsed by FEMA or any state agency.
Reuse, citation and corrections
Reuse and citation: Hazard Plain text and tables are licensed under Creative Commons Attribution 4.0 International (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); credit Hazard Plain and the release. The underlying federal data are public domain; OpenFEMA data are also subject to the OpenFEMA terms and conditions.
Cite this: Hazard Plain (2026). Adams County, CO: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-28; County area 08001). Preview: automated baseline. Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.
Corrections: to report an error, name the packet, the table and what your records show. Contact: to be added
Hazard Plain release 2026-10. As of 2026-09-28; Storm Events data through 2026-06-30. File hazard-plain_2026-10_CO_08001. Preview: automated baseline.