Adams County, Colorado: hazard history

FEMA declared 12 disasters that named Adams County between 1965 and 2020.

Most recent declarations

• DR-4498 2020 · Biological · Covid-19 Pandemic
• EM-3436 2020 · Biological · Covid-19
• DR-4229 2015 · Flood · Severe Storms, Tornadoes, Flooding, Landslides, And Mudslides
• EM-3365 2013 · Flood · Severe Storms, Flooding, Landslides, And Mudslides
• DR-4145 2013 · Flood · Severe Storms, Flooding, Landslides, And Mudslides
• EM-3270 2006 · Snowstorm · Snow
• EM-3224 2005 · Coastal Storm · Hurricane Katrina Evacuation
• EM-3185 2003 · Snowstorm · Snow
• DR-1421 2002 · Fire · Wildfires
• DR-385 1973 · Flood · Heavy Rains, Snowmelt And Flooding

Not counted above: 12 statewide declarations, which covered every county in Colorado. A declaration is a decision to send federal help, not a measure of how bad an event was. Records run from 1953. Source: FEMA OpenFEMA Disaster Declarations Summaries.

Records start in 1996. Damage is NOAA's estimate at the time, in nominal dollars, and is often rounded; it is not insurance claims data. A storm that crossed two NOAA zones in this county is recorded, and counted, once per zone. A storm filed against a forecast zone is counted in every county that zone covers, with the whole storm's damage; do not add these figures across counties.

NOAA storm event records in Adams County each year. The busiest year was 2024, with 66 records.

Years with no record are left out of the table, not shown as zero.

Costliest records

1. Hail · Jul 13, 2011$164.8M
   NOAA name: Adams County · 2 injuries · NOAA record 331553
2. Hail · May 22, 1996$120.0M
   NOAA name: Adams County · NOAA record 5553543
3. Hail · May 26, 2010$70.0M
   NOAA name: Adams County · NOAA record 224718
4. Hail · Jun 20, 2001$49.0M
   NOAA name: Adams County · 5 injuries · NOAA record 5252566
5. Hail · Jun 14, 1999$35.0M
   NOAA name: Adams County · NOAA record 5704685

Deadliest records

1. Cold/Wind Chill · Dec 18, 19983 deaths
   NOAA name: NWS forecast zone · 15 injuries · NOAA record 5676985
2. Blizzard · Dec 20, 20062 deaths
   NOAA name: NWS forecast zone · NOAA record 2280
3. Winter Weather · Mar 30, 20092 deaths
   NOAA name: NWS forecast zone · NOAA record 159843
4. Cold/Wind Chill · Dec 18, 19961 death
   NOAA name: NWS forecast zone · NOAA record 5577841
5. Flash Flood · Aug 17, 20001 death
   NOAA name: Adams County · NOAA record 5170231

Each line is one NOAA record, linked to its page at NOAA. One large storm can appear more than once if NOAA recorded it in several zones of this county. Dollars are nominal.

The National Flood Insurance Program paid $594K on 156 claims in Adams County from 1978 to 2024.

A count of claims, not a rate: NFIP publishes no count of insured homes beside it, and most flood damage is uninsured. Nominal dollars. Records run from 1978 to 2024; claims filed without a county code are not on any county page. Source: FEMA OpenFEMA FIMA NFIP Redacted Claims.

A hazard vulnerability analysis rates each hazard for probability, impact, preparedness and response. Probability is the one column the county’s federal record can fill — NCEI storm events from 1996 to 2026 and FEMA declarations naming the county — and this is what it says for a facility here, on the 0–3 scale of the all-hazards structure surveyors expect. The other six columns are the facility’s own judgment about its building, and Calchis leaves them blank.

A dash means the record does not speak to that hazard; it is not a zero. Whether a finished document satisfies the CMS Emergency Preparedness Rule is the facility’s finding and its surveyor’s. Complete the HVA for a facility in Adams County — the technological, human and hazardous-materials rows, the six facility columns, the approval and the printed document — or read the sample analysis on that page first.

• Every figure is counted from public federal records held by Calchis: NOAA NCEI Storm Events, FEMA OpenFEMA Disaster Declarations, and FEMA NFIP claims. Nothing is modeled or estimated.
• NOAA files some events against a county and others against an NWS forecast zone, and publishes a code for both. Records are counted as Adams County by that code — county records by the county's own FIPS code, zone records through the National Weather Service's published list of which counties each zone covers. No name matching is involved. Of 1,034 records, 599 were filed against this county and 435 against a forecast zone covering it. A zone storm is counted in every county its zone covers, and its damage figure is the whole storm's, not this county's share — NOAA does not publish that split. So these figures describe this county; they must not be added up across counties. Left out: 0% of Colorado's NOAA records, which are marine zones or zones NWS does not map to a county.
• Counts last rebuilt from the source records on Sep 15, 2026.