Landslide Risk in Montana
All Montana counties ranked by FEMA National Risk Index landslide score
Landslide risk — downhill movement of rock, soil, and debris on unstable slopes — is rated for 56 of 56 Montana counties in FEMA's National Risk Index. Carbon County carries the state's highest landslide score at 98.8, with $854K in expected annual landslide losses.
1 Montana county is rated High or Very High for landslide, and expected annual losses from landslide total roughly $3M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Landslide
| # | County | Landslide Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Carbon County | High | 2.50 / yr | $854K | |
| 2 | Flathead County | Medium | 4.16 / yr | $417K | |
| 3 | Sanders County | Medium | 2.21 / yr | $149K | |
| 4 | Park County | Medium | 2.60 / yr | $264K | |
| 5 | Gallatin County | Medium | 2.58 / yr | $352K | |
| 6 | Jefferson County | Medium | 1.24 / yr | $185K | |
| 7 | Madison County | Medium | 4.24 / yr | $192K | |
| 8 | Lewis and Clark County | Medium | 2.20 / yr | $154K | |
| 9 | Missoula County | Medium | 2.07 / yr | $202K | |
| 10 | Ravalli County | Medium | 1.55 / yr | $92K | |
| 11 | Beaverhead County | Medium | 3.66 / yr | $60K | |
| 12 | Lincoln County | Medium | 2.38 / yr | $49K | |
| 13 | Granite County | Medium | 1.17 / yr | $68K | |
| 14 | Powell County | Medium | 1.59 / yr | $61K | |
| 15 | Meagher County | Medium | 2.72 / yr | $61K | |
| 16 | Mineral County | Medium | 1.05 / yr | $55K | |
| 17 | Lake County | Medium | 1.40 / yr | $53K | |
| 18 | Silver Bow County | Medium | 0.53 / yr | $72K | |
| 19 | Broadwater County | Medium | 0.72 / yr | $47K | |
| 20 | Deer Lodge County | Low | 0.34 / yr | $15K | |
| 21 | Big Horn County | Low | 5.18 / yr | $5K | |
| 22 | Cascade County | Low | 1.54 / yr | $8K | |
| 23 | Yellowstone County | Low | 1.22 / yr | $8K | |
| 24 | Fergus County | Low | 2.31 / yr | $6K | |
| 25 | Rosebud County | Low | 2.59 / yr | $2K | |
| 26 | Glacier County | Low | 1.51 / yr | $2K | |
| 27 | Musselshell County | Low | 0.89 / yr | $3K | |
| 28 | Custer County | Very Low | 2.88 / yr | $2K | |
| 29 | Stillwater County | Very Low | 1.39 / yr | $3K | |
| 30 | Sweet Grass County | Very Low | 2.27 / yr | $3K | |
| 31 | Teton County | Very Low | 0.85 / yr | $2K | |
| 32 | Chouteau County | Very Low | 1.17 / yr | $913 | |
| 33 | Blaine County | Very Low | 1.31 / yr | $559 | |
| 34 | Powder River County | Very Low | 2.99 / yr | $1K | |
| 35 | Phillips County | Very Low | 1.56 / yr | $607 | |
| 36 | Valley County | Very Low | 1.24 / yr | $751 | |
| 37 | Hill County | Very Low | 0.45 / yr | $478 | |
| 38 | Garfield County | Very Low | 2.18 / yr | $687 | |
| 39 | Judith Basin County | Very Low | 1.01 / yr | $486 | |
| 40 | Dawson County | Very Low | 0.90 / yr | $360 | |
| 41 | Carter County | Very Low | 0.96 / yr | $344 | |
| 42 | Toole County | Very Low | 0.38 / yr | $151 | |
| 43 | Roosevelt County | Very Low | 0.44 / yr | $93 | |
| 44 | Richland County | Very Low | 0.69 / yr | $204 | |
| 45 | McCone County | Very Low | 0.84 / yr | $149 | |
| 46 | Wheatland County | Very Low | 0.46 / yr | $106 | |
| 47 | Pondera County | Very Low | 0.46 / yr | $66 | |
| 48 | Prairie County | Very Low | 0.79 / yr | $74 | |
| 49 | Sheridan County | Very Low | 0.30 / yr | $72 | |
| 50 | Golden Valley County | Very Low | 0.37 / yr | $73 | |
| 51 | Treasure County | Very Low | 0.61 / yr | $91 | |
| 52 | Fallon County | Very Low | 0.50 / yr | $80 | |
| 53 | Petroleum County | Very Low | 0.77 / yr | $55 | |
| 54 | Liberty County | Very Low | 0.25 / yr | $16 | |
| 55 | Wibaux County | Very Low | 0.39 / yr | $23 | |
| 56 | Daniels County | Very Low | 0.24 / yr | $23 |
56 Montana counties with measurable landslide risk. See the national landslide ranking or all Montana counties by overall risk.
Frequently Asked Questions
Which Montana county has the highest landslide risk?
Carbon County has the highest FEMA landslide risk score in Montana at 98.8 (High), with $854K in expected annual losses and about 2.50 events per year.
How many Montana counties face significant landslide risk?
56 Montana counties record measurable landslide risk in FEMA's National Risk Index; 1 of them are rated High or Very High.