Montana hail risk
Valley County has the highest hail risk in Montana, scoring 88.1 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index. Recorded hail events across Montana have decreased 34% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Valley County | 88.1 | Relatively Moderate | 78 |
| 2 | Gallatin County | 84.5 | Relatively Moderate | 27 |
| 3 | Yellowstone County | 81.5 | Relatively Moderate | 185 |
| 4 | Roosevelt County | 57.6 | Relatively Low | 55 |
| 5 | McCone County | 57.2 | Relatively Low | 44 |
| 6 | Cascade County | 53.4 | Relatively Low | 68 |
| 7 | Big Horn County | 51.8 | Relatively Low | 54 |
| 8 | Custer County | 47.6 | Relatively Low | 63 |
| 9 | Dawson County | 46.6 | Relatively Low | 61 |
| 10 | Carbon County | 46.1 | Relatively Low | 36 |
| 11 | Richland County | 45.6 | Relatively Low | 37 |
| 12 | Rosebud County | 44 | Relatively Low | 63 |
| 13 | Park County | 43.5 | Relatively Low | 16 |
| 14 | Musselshell County | 35.7 | Relatively Low | 63 |
| 15 | Ravalli County | 28.8 | Very Low | 20 |
| 16 | Stillwater County | 28.7 | Very Low | 54 |
| 17 | Blaine County | 28.2 | Very Low | 33 |
| 18 | Fergus County | 27.3 | Very Low | 62 |
| 19 | Silver Bow County | 27.2 | Very Low | 9 |
| 20 | Phillips County | 26.6 | Very Low | 46 |
| 21 | Powder River County | 26 | Very Low | 82 |
| 22 | Fallon County | 25.1 | Very Low | 41 |
| 23 | Madison County | 24.4 | Very Low | 8 |
| 24 | Hill County | 24.1 | Very Low | 24 |
| 25 | Wheatland County | 23.3 | Very Low | 23 |
| 26 | Garfield County | 22.9 | Very Low | 49 |
| 27 | Carter County | 22.6 | Very Low | 60 |
| 28 | Sheridan County | 22.2 | Very Low | 37 |
| 29 | Flathead County | 21.9 | Very Low | 13 |
| 30 | Sweet Grass County | 21.4 | Very Low | 26 |
| 31 | Wibaux County | 20 | Very Low | 27 |
| 32 | Jefferson County | 19.6 | Very Low | 20 |
| 33 | Broadwater County | 17.8 | Very Low | 14 |
| 34 | Prairie County | 16.2 | Very Low | 30 |
| 35 | Daniels County | 14.1 | Very Low | 26 |
| 36 | Golden Valley County | 13.8 | Very Low | 24 |
| 37 | Pondera County | 13.5 | Very Low | 8 |
| 38 | Meagher County | 13.4 | Very Low | 7 |
| 39 | Missoula County | 13.3 | Very Low | 22 |
| 40 | Judith Basin County | 13.2 | Very Low | 33 |
| 41 | Beaverhead County | 12.5 | Very Low | 10 |
| 42 | Liberty County | 12.3 | Very Low | 9 |
| 43 | Lake County | 11.2 | Very Low | 12 |
| 44 | Deer Lodge County | 10.6 | Very Low | 2 |
| 45 | Powell County | 10.5 | Very Low | 11 |
| 46 | Lewis and Clark County | 10.2 | Very Low | 15 |
| 47 | Petroleum County | 9.5 | Very Low | 37 |
| 48 | Chouteau County | 8.9 | Very Low | 20 |
| 49 | Teton County | 8.8 | Very Low | 22 |
| 50 | Glacier County | 8.7 | Very Low | 22 |
| 51 | Treasure County | 7.8 | Very Low | 16 |
| 52 | Granite County | 6.5 | Very Low | 9 |
| 53 | Sanders County | 4.5 | Very Low | 4 |
| 54 | Lincoln County | 4.1 | Very Low | 2 |
| 55 | Toole County | 3.5 | Very Low | 8 |
| 56 | Mineral County | 1.3 | Very Low | 3 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Hail risk nationally:
Other hazard risks in Montana:
Frequently asked questions
What is the highest hail risk county in Montana?
Valley County, MT has the highest hail risk in Montana, with a FEMA National Risk Index score of 88.1 out of 100 (rated "Relatively Moderate").
What causes hail risk in Montana?
Hail risk reflects expected annual losses from damaging hailstones to structures, vehicles, and crops. High scores cluster in the central plains and Front Range — a corridor sometimes called "Hail Alley" — where large-diameter hail is most frequent. Hail causes over $10 billion in US property damage in active years, much of it to roofs, vehicles, and crops.