Garfield County, Montana

What hazards hit Garfield County most?

The most frequent records are hail reports: 291 since 1965. 75% of its hail reports since 1965 fell in June and July. The rank column places the county among Montana'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 Garfield County had?

NOAA records 12 tornadoes in Garfield County from 1975 to 2014, the strongest rated EF0, with 0 deaths and 0 injuries recorded in the county. That is 24th of 56 Montana 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 12 tornadoes whose track touched Garfield County since 1950 (NOAA's county records number 12, the same count); along their whole tracks they killed 0 people.

Map of the strongest tornado tracks in Montana.

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 Garfield County?

The most recent record with damage, injuries or deaths is the May 10, 2016 blizzard ($295,000 in damage in 2025 dollars).

NWS Employees driving along US Highway 200 through western Garfield County reported whiteout conditions with blowing and drifting snow during the evening hours on May 10th. County emergency officials later reported 24 to 36 inches of snow and 60 power poles snapped. Event times are estimated.
National Weather Service event narrative, NOAA Storm Events Database (search the full record, event 628052)

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 Garfield 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).

Drought in the 2020-26: 30 records against 9 in the decade before, 30 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 Garfield 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?

75% of its hail reports since 1965 fell in June and July. The two busiest months are in violet.

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

Federal disaster declarations for Garfield County

FEMA's register lists 13 declarations that include Garfield County: 8 major disasters, 2 emergencies and 3 fire management assistance declarations. Most were for fire (4) and flood (3).

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 Garfield County had?

NOAA's Storm Events Database holds 37 flood or flash flood records for Garfield County from 1997 to 2026, on 31 days, with 0 deaths. By flood insurance claims since 1978 (OpenFEMA, as of September 8, 2026), Garfield County ranks 2590th of 2,942 U.S. counties.

The National Flood Insurance Program has paid $105,000 on 5 claims filed in Garfield County; the most in one year was 3 in 2026. 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 Garfield County

FEMA's National Risk Index rates Garfield County Very Low overall, with an expected annual loss of $2.6 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 Garfield County

1. Valley County 1,841
2. Phillips County 1,330
3. Garfield County 885
4. Rosebud County 832
5. McCone County 748
6. Custer County 686
7. Prairie County 527
8. Petroleum County 389

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 MontanaEvery Montana tornado since 1950 and the counties with the most per square mile
• Hail in MontanaThe state's hail reports, by county, year and month
• The Montana recordEvery hazard in the state, its deadliest events and its federal declarations
• FEMA's risk rating for each hazard in Garfield CountyThe hazard risk calculator: 18 hazards beside the county's record
• Download Garfield County's FEMA declarations (CSV)13 rows: every declaration that named the county, for your own analysis