Montana landslide risk
Carbon County has the highest landslide risk in Montana, scoring 98.8 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Carbon County | 98.8 | Relatively High | 0 |
| 2 | Flathead County | 97.3 | Relatively Moderate | 1 |
| 3 | Sanders County | 96.8 | Relatively Moderate | 1 |
| 4 | Park County | 96.7 | Relatively Moderate | 0 |
| 5 | Gallatin County | 96.6 | Relatively Moderate | 0 |
| 6 | Jefferson County | 95.9 | Relatively Moderate | 0 |
| 7 | Madison County | 95.8 | Relatively Moderate | 0 |
| 8 | Lewis and Clark County | 95.2 | Relatively Moderate | 2 |
| 9 | Missoula County | 95.1 | Relatively Moderate | 0 |
| 10 | Ravalli County | 93.6 | Relatively Moderate | 3 |
| 11 | Beaverhead County | 92.7 | Relatively Moderate | 0 |
| 12 | Lincoln County | 92 | Relatively Moderate | 0 |
| 13 | Granite County | 91.9 | Relatively Moderate | 1 |
| 14 | Powell County | 91.7 | Relatively Moderate | 0 |
| 15 | Meagher County | 91.4 | Relatively Moderate | 0 |
| 16 | Mineral County | 91.3 | Relatively Moderate | 0 |
| 17 | Lake County | 90.8 | Relatively Moderate | 0 |
| 18 | Silver Bow County | 90.4 | Relatively Moderate | 0 |
| 19 | Broadwater County | 89.2 | Relatively Moderate | 0 |
| 20 | Deer Lodge County | 80.8 | Relatively Low | 0 |
| 21 | Big Horn County | 73.8 | Relatively Low | 0 |
| 22 | Cascade County | 71.9 | Relatively Low | 0 |
| 23 | Yellowstone County | 71.4 | Relatively Low | 0 |
| 24 | Fergus County | 71.2 | Relatively Low | 0 |
| 25 | Rosebud County | 67.1 | Relatively Low | 0 |
| 26 | Glacier County | 63.8 | Relatively Low | 1 |
| 27 | Musselshell County | 63.7 | Relatively Low | 0 |
| 28 | Custer County | 59 | Very Low | 0 |
| 29 | Stillwater County | 56.9 | Very Low | 0 |
| 30 | Sweet Grass County | 56.3 | Very Low | 0 |
| 31 | Teton County | 52.9 | Very Low | 1 |
| 32 | Chouteau County | 46.9 | Very Low | 0 |
| 33 | Blaine County | 44.7 | Very Low | 0 |
| 34 | Powder River County | 44.4 | Very Low | 0 |
| 35 | Phillips County | 43.7 | Very Low | 0 |
| 36 | Valley County | 42 | Very Low | 0 |
| 37 | Garfield County | 38.7 | Very Low | 0 |
| 38 | Hill County | 38.7 | Very Low | 0 |
| 39 | Judith Basin County | 35 | Very Low | 0 |
| 40 | Dawson County | 33.3 | Very Low | 0 |
| 41 | Carter County | 28 | Very Low | 0 |
| 42 | Toole County | 24.6 | Very Low | 0 |
| 43 | Roosevelt County | 23.4 | Very Low | 0 |
| 44 | Richland County | 22.7 | Very Low | 0 |
| 45 | McCone County | 21.5 | Very Low | 0 |
| 46 | Wheatland County | 21.1 | Very Low | 0 |
| 47 | Pondera County | 18.9 | Very Low | 0 |
| 48 | Prairie County | 18.6 | Very Low | 0 |
| 49 | Sheridan County | 17.5 | Very Low | 0 |
| 50 | Golden Valley County | 16.7 | Very Low | 0 |
| 51 | Treasure County | 15.6 | Very Low | 0 |
| 52 | Fallon County | 14.7 | Very Low | 0 |
| 53 | Petroleum County | 13.6 | Very Low | 0 |
| 54 | Liberty County | 8.6 | Very Low | 0 |
| 55 | Wibaux County | 8.1 | Very Low | 0 |
| 56 | Daniels County | 8 | Very Low | 0 |
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.
Landslide risk nationally:
Other hazard risks in Montana:
Frequently asked questions
What is the highest landslide risk county in Montana?
Carbon County, MT has the highest landslide risk in Montana, with a FEMA National Risk Index score of 98.8 out of 100 (rated "Relatively High").
What causes landslide risk in Montana?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.