Montana earthquake risk
Flathead County has the highest earthquake risk in Montana, scoring 95.8 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Flathead County | 95.8 | Relatively Moderate |
| 2 | Gallatin County | 94.1 | Relatively Moderate |
| 3 | Lake County | 92.3 | Relatively Moderate |
| 4 | Missoula County | 91.3 | Relatively Moderate |
| 5 | Silver Bow County | 87.4 | Relatively Low |
| 6 | Lewis and Clark County | 86.8 | Relatively Low |
| 7 | Beaverhead County | 85.7 | Relatively Low |
| 8 | Madison County | 79.9 | Relatively Low |
| 9 | Park County | 76.4 | Relatively Low |
| 10 | Broadwater County | 74.9 | Relatively Low |
| 11 | Yellowstone County | 74.7 | Relatively Low |
| 12 | Cascade County | 71.8 | Relatively Low |
| 13 | Ravalli County | 69.3 | Relatively Low |
| 14 | Sanders County | 67.9 | Relatively Low |
| 15 | Jefferson County | 64.8 | Relatively Low |
| 16 | Lincoln County | 63.5 | Relatively Low |
| 17 | Glacier County | 60.8 | Relatively Low |
| 18 | Powell County | 59.5 | Very Low |
| 19 | Teton County | 53.7 | Very Low |
| 20 | Carbon County | 53.6 | Very Low |
| 21 | Pondera County | 51.3 | Very Low |
| 22 | Deer Lodge County | 50 | Very Low |
| 23 | Big Horn County | 39.6 | Very Low |
| 24 | Granite County | 37.7 | Very Low |
| 25 | Sweet Grass County | 34.9 | Very Low |
| 26 | Stillwater County | 33.7 | Very Low |
| 27 | Custer County | 31.4 | Very Low |
| 28 | Meagher County | 30.6 | Very Low |
| 29 | Toole County | 29.9 | Very Low |
| 30 | Rosebud County | 29.7 | Very Low |
| 31 | Mineral County | 29.1 | Very Low |
| 32 | Chouteau County | 27.1 | Very Low |
| 33 | Fergus County | 25.9 | Very Low |
| 34 | Wheatland County | 24.3 | Very Low |
| 35 | Valley County | 23 | Very Low |
| 36 | Musselshell County | 20.7 | Very Low |
| 37 | Hill County | 20.5 | Very Low |
| 38 | Judith Basin County | 18.8 | Very Low |
| 39 | Powder River County | 18 | Very Low |
| 40 | Roosevelt County | 15.8 | Very Low |
| 41 | Liberty County | 15.4 | Very Low |
| 42 | Phillips County | 15.1 | Very Low |
| 43 | Dawson County | 15 | Very Low |
| 44 | Blaine County | 13.4 | Very Low |
| 45 | Carter County | 12.3 | Very Low |
| 46 | Golden Valley County | 11.4 | Very Low |
| 47 | McCone County | 10 | Very Low |
| 48 | Richland County | 8.4 | Very Low |
| 49 | Fallon County | 7.8 | Very Low |
| 50 | Sheridan County | 6.5 | Very Low |
| 51 | Garfield County | 6.4 | Very Low |
| 52 | Prairie County | 5.3 | Very Low |
| 53 | Daniels County | 3.3 | Very Low |
| 54 | Treasure County | 3.3 | Very Low |
| 55 | Wibaux County | 2 | Very Low |
| 56 | Petroleum County | 1.7 | Very Low |
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.
Earthquake risk nationally:
Other hazard risks in Montana:
Frequently asked questions
What is the highest earthquake risk county in Montana?
Flathead County, MT has the highest earthquake risk in Montana, with a FEMA National Risk Index score of 95.8 out of 100 (rated "Relatively Moderate").
What causes earthquake risk in Montana?
Earthquake risk reflects expected annual losses from ground shaking. High scores concentrate in California, the Pacific Northwest, Alaska, and the New Madrid Seismic Zone (spanning Missouri, Arkansas, Tennessee, and neighboring states). NOAA's Storm Events Database does not track earthquakes, so recorded event counts are not shown.