Delta County, Colorado

What hazards hit Delta County most?

The most frequent records are winter storm records: 881 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 Delta County had?

NOAA records 3 tornadoes in Delta County from 1994 to 2014, the strongest rated F1, with 0 deaths and 0 injuries recorded in the county. 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 3 tornadoes whose track touched Delta County since 1950 (NOAA's county records number 3, the same count); along their whole tracks they killed 0 people.

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 Delta County?

The most recent record with damage, injuries or deaths is the September 1, 2025 wildfire ($40.4 million in damage in 2025 dollars).

The Turner Gulch Fire started in early July due to a lightning strike 7.5 miles northeast of Gateway, Colorado to the east and south of Highway 141. The fire grew to 31,699 acres before it was contained in early September. The estimated cost to date was $40,400,000. 15 structures were threatened but none were destroyed.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 1280929)

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 Delta 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).

High wind and dust storms in the 2020-26: 38 records against 7 in the decade before, 38 of them forecast-zone records. Cells marked z rose mostly through zone records. The local National Weather Service office files these once per forecast zone, so a change in how it draws its zones or splits a storm into records moves this count as much as the weather does; read it beside the Delta County days with a record above.

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 Delta County. The two busiest months are in violet.

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

Federal disaster declarations for Delta County

FEMA's register lists 9 declarations that include Delta County: 5 major disasters, 3 emergencies and one fire management assistance declaration. Most were for flood (3) and biological (2).

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 Delta County had?

NOAA's Storm Events Database holds 20 flood or flash flood records for Delta County from 1998 to 2023, on 17 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Delta County ranks 2105th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $86,000 on 19 claims filed in Delta County; the most in one year was 5 in 1984. 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 Delta County

FEMA's National Risk Index rates Delta County Relatively Low overall, with an expected annual loss of $14.1 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 Delta County

1. Mesa County 3,661
2. Gunnison County 2,333
3. Montrose County 2,018
4. Delta County 1,503

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 Delta CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Delta County's FEMA declarations (CSV)9 rows: every declaration that named the county, for your own analysis