Idaho earthquake risk
Bonneville County has the highest earthquake risk in Idaho, scoring 94.2 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Bonneville County | 94.2 | Relatively Moderate |
| 2 | Bingham County | 88.3 | Relatively Low |
| 3 | Ada County | 88.2 | Relatively Low |
| 4 | Madison County | 87.6 | Relatively Low |
| 5 | Fremont County | 82.9 | Relatively Low |
| 6 | Bannock County | 82.8 | Relatively Low |
| 7 | Jefferson County | 80.6 | Relatively Low |
| 8 | Custer County | 79.3 | Relatively Low |
| 9 | Kootenai County | 79.2 | Relatively Low |
| 10 | Canyon County | 78.8 | Relatively Low |
| 11 | Teton County | 78.3 | Relatively Low |
| 12 | Cassia County | 74.5 | Relatively Low |
| 13 | Minidoka County | 74.3 | Relatively Low |
| 14 | Twin Falls County | 74 | Relatively Low |
| 15 | Blaine County | 73.7 | Relatively Low |
| 16 | Caribou County | 72.1 | Relatively Low |
| 17 | Franklin County | 70.5 | Relatively Low |
| 18 | Bear Lake County | 68.9 | Relatively Low |
| 19 | Valley County | 66.2 | Relatively Low |
| 20 | Jerome County | 58.7 | Very Low |
| 21 | Gooding County | 58.5 | Very Low |
| 22 | Power County | 58.2 | Very Low |
| 23 | Payette County | 55.9 | Very Low |
| 24 | Bonner County | 55.8 | Very Low |
| 25 | Washington County | 53.8 | Very Low |
| 26 | Lemhi County | 53.5 | Very Low |
| 27 | Gem County | 51 | Very Low |
| 28 | Butte County | 45.9 | Very Low |
| 29 | Latah County | 43.6 | Very Low |
| 30 | Elmore County | 42 | Very Low |
| 31 | Idaho County | 40.1 | Very Low |
| 32 | Boise County | 40 | Very Low |
| 33 | Oneida County | 39.8 | Very Low |
| 34 | Shoshone County | 38.4 | Very Low |
| 35 | Nez Perce County | 38.3 | Very Low |
| 36 | Adams County | 37.4 | Very Low |
| 37 | Owyhee County | 34.5 | Very Low |
| 38 | Lincoln County | 32.2 | Very Low |
| 39 | Clark County | 30.9 | Very Low |
| 40 | Benewah County | 26.4 | Very Low |
| 41 | Boundary County | 25.4 | Very Low |
| 42 | Lewis County | 23.4 | Very Low |
| 43 | Camas County | 23.2 | Very Low |
| 44 | Clearwater County | 23 | 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 Idaho:
Frequently asked questions
What is the highest earthquake risk county in Idaho?
Bonneville County, ID has the highest earthquake risk in Idaho, with a FEMA National Risk Index score of 94.2 out of 100 (rated "Relatively Moderate").
What causes earthquake risk in Idaho?
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.