Larimer County, Colorado

What hazards hit Larimer County most?

The most frequent records are winter storm records: 669 since 1996. The rank column places the county among Colorado's counties by days with a record per 1,000 square miles of land over each hazard's complete period.

Source: NOAA NCEI Storm Events Database (county and forecast-zone records attributed to the county; a zone record shows its own totals on each county it covers). Days: dates with at least one record of the hazard in the county. Ranks: days with a record per 1,000 square miles of land (Census Bureau 2024 Gazetteer), since 1950 for tornadoes, 1955 for hail and thunderstorm wind, 1996 for the rest.

How many tornadoes has Larimer County had?

NOAA records 33 tornadoes in Larimer County from 1954 to 2018, the strongest rated EF3, with 0 deaths and 0 injuries recorded in the county. That is 28th of 63 Colorado counties by days with tornadoes per 1,000 square miles since 1950. A tornado that crossed a county line is counted in each county it touched, with the length of its path inside the county.

Counted as whole tornadoes rather than county records, the Storm Prediction Center's database holds 33 tornadoes whose track touched Larimer County since 1950 (NOAA's county records number 33, the same count); along their whole tracks they killed 1 person, 0 of them in Larimer County.

Map of the strongest tornado tracks in Colorado.

Source: NOAA NCEI Storm Events Database, tornado records by county (path length in the county, maximum width); ratings as published: F scale before February 1, 2007, EF scale after. Whole-track figures: NOAA Storm Prediction Center tornado database (1950-2025). SPC severe weather database.

When was the last damaging storm in Larimer County?

The most recent record with damage, injuries or deaths is the March 17, 2025 wildfire ($750,000 in damage in 2025 dollars).

Wildfire started around 1:39 pm in rural Larimer County, approximately 4.5 miles west of Berthoud, CO. One house was destroyed. No injuries reported. Fire burned approximately 21 acres, before being fully contained by 3:49 pm.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1242224)

Source: NOAA NCEI Storm Events Database; every record of 2025-2026 is listed, earlier ones when they caused deaths, injuries or $250,000 of damage (2025 dollars), and every tornado.

The deadliest and costliest records

Source: NOAA NCEI Storm Events Database: deaths and injuries direct and indirect; damage is property plus crops as estimated by the National Weather Service, converted to 2025 dollars.

Is it getting more frequent?

Records per decade for Larimer County's most frequent hazards. Counts rose everywhere after 1996, when NOAA began recording every event type, so compare decades within a hazard's complete period only (the shaded cells come before it).

Source: NOAA NCEI Storm Events Database, records per calendar decade; zone records from the CZ_TYPE field (Z).

What time of year?

Records by month in Larimer County. The two busiest months are in violet.

Source: NOAA NCEI Storm Events Database, records by the month they began.

Federal disaster declarations for Larimer County

FEMA's register lists 30 declarations that include Larimer County: 13 major disasters, 5 emergencies and 12 fire management assistance declarations. Most were for fire (15) and flood (7).

Source: FEMA OpenFEMA Disaster Declarations Summaries (v2), declarations through October 2, 2026; one declaration is counted once however many areas it names. OpenFEMA dataset page.

How many floods has Larimer County had?

NOAA's Storm Events Database holds 83 flood or flash flood records for Larimer County from 1996 to 2024, on 59 days, with 13 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Larimer County ranks 470th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $15.1 million on 547 claims filed in Larimer County; the most in one year was 293 in 2013. Claims count insured losses only: uninsured flood damage is not in this file.

Source: FEMA OpenFEMA NFIP Redacted Claims, as of September 8, 2026; claims by year of loss, payments in the dollars of the year paid. OpenFEMA dataset page.

FEMA's modeled risk for Larimer County

FEMA's National Risk Index rates Larimer County Relatively Moderate overall, with an expected annual loss of $127 million. These are FEMA's model estimates of future loss from 18 hazards, not a count of what happened; they can differ from the record above.

Source: FEMA National Risk Index, county table, December 2025 release. FEMA's National Risk Index map.

Counties that share a border with Larimer County

1. Albany County, WY 6,260
2. Laramie County, WY 5,081
3. Weld County 2,459
4. Larimer County 1,978
5. Boulder County 1,789
6. Grand County 1,114
7. Jackson County 570

Source: U.S. Census Bureau county adjacency file; NOAA NCEI Storm Events Database, records since 1950. The Census Bureau's adjacency file.

Next

• Tornadoes in ColoradoEvery Colorado tornado since 1950 and the counties with the most per square mile
• Winter storms in ColoradoThe state's winter storm records, by county, year and month
• The Colorado recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Larimer CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Larimer County's FEMA declarations (CSV)30 rows: every declaration that named the county, for your own analysis