Idaho landslide risk
Idaho County has the highest landslide risk in Idaho, scoring 98.9 out of 100 — rated "Relatively High" by FEMA's National Risk Index. NOAA has recorded 43 landslide events across Idaho over the past decade.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Idaho County | 98.9 | Relatively High | 1 |
| 2 | Custer County | 98.2 | Relatively High | 2 |
| 3 | Shoshone County | 98.2 | Relatively High | 1 |
| 4 | Boundary County | 97.7 | Relatively Moderate | 8 |
| 5 | Boise County | 97.3 | Relatively Moderate | 2 |
| 6 | Clearwater County | 97.3 | Relatively Moderate | 1 |
| 7 | Valley County | 96.4 | Relatively Moderate | 0 |
| 8 | Lemhi County | 95.7 | Relatively Moderate | 6 |
| 9 | Kootenai County | 95.5 | Relatively Moderate | 3 |
| 10 | Bonneville County | 94.2 | Relatively Moderate | 0 |
| 11 | Benewah County | 93.9 | Relatively Moderate | 1 |
| 12 | Bonner County | 93.9 | Relatively Moderate | 3 |
| 13 | Twin Falls County | 93.1 | Relatively Moderate | 0 |
| 14 | Adams County | 91.6 | Relatively Moderate | 0 |
| 15 | Blaine County | 86.3 | Relatively Low | 1 |
| 16 | Bear Lake County | 81.9 | Relatively Low | 1 |
| 17 | Elmore County | 80.3 | Relatively Low | 0 |
| 18 | Fremont County | 78.6 | Relatively Low | 0 |
| 19 | Latah County | 75.4 | Relatively Low | 2 |
| 20 | Washington County | 72.9 | Relatively Low | 0 |
| 21 | Owyhee County | 71.4 | Relatively Low | 0 |
| 22 | Ada County | 69.1 | Relatively Low | 3 |
| 23 | Teton County | 68.8 | Relatively Low | 0 |
| 24 | Bingham County | 68.6 | Relatively Low | 0 |
| 25 | Madison County | 64.2 | Relatively Low | 0 |
| 26 | Bannock County | 58.4 | Very Low | 0 |
| 27 | Camas County | 55.1 | Very Low | 0 |
| 28 | Butte County | 53.3 | Very Low | 0 |
| 29 | Cassia County | 49.5 | Very Low | 0 |
| 30 | Clark County | 49.2 | Very Low | 0 |
| 31 | Gem County | 47.4 | Very Low | 0 |
| 32 | Caribou County | 45.1 | Very Low | 0 |
| 33 | Nez Perce County | 42.5 | Very Low | 3 |
| 34 | Franklin County | 41.3 | Very Low | 1 |
| 35 | Lewis County | 39.5 | Very Low | 3 |
| 36 | Payette County | 36.7 | Very Low | 0 |
| 37 | Jefferson County | 34.5 | Very Low | 0 |
| 38 | Canyon County | 31.7 | Very Low | 0 |
| 39 | Gooding County | 26 | Very Low | 0 |
| 40 | Oneida County | 22.9 | Very Low | 1 |
| 41 | Power County | 19.1 | Very Low | 0 |
| 42 | Jerome County | 10.3 | Very Low | 0 |
| 43 | Minidoka County | 9.7 | Very Low | 0 |
| 44 | Lincoln County | 9.4 | 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 Idaho:
Frequently asked questions
What is the highest landslide risk county in Idaho?
Idaho County, ID has the highest landslide risk in Idaho, with a FEMA National Risk Index score of 98.9 out of 100 (rated "Relatively High").
What causes landslide risk in Idaho?
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.