Idaho hail risk
Bonneville County has the highest hail risk in Idaho, scoring 84.9 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index. Recorded hail events across Idaho have increased 15% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Bonneville County | 84.9 | Relatively Moderate | 18 |
| 2 | Ada County | 54.5 | Relatively Low | 6 |
| 3 | Canyon County | 46.7 | Relatively Low | 4 |
| 4 | Bingham County | 44.1 | Relatively Low | 4 |
| 5 | Madison County | 41.7 | Relatively Low | 5 |
| 6 | Bannock County | 40.3 | Relatively Low | 18 |
| 7 | Twin Falls County | 31.1 | Very Low | 8 |
| 8 | Payette County | 28.2 | Very Low | 3 |
| 9 | Gooding County | 26.3 | Very Low | 4 |
| 10 | Latah County | 25 | Very Low | 2 |
| 11 | Teton County | 21.4 | Very Low | 0 |
| 12 | Jefferson County | 20.6 | Very Low | 7 |
| 13 | Washington County | 18.7 | Very Low | 0 |
| 14 | Elmore County | 17.8 | Very Low | 4 |
| 15 | Kootenai County | 17.3 | Very Low | 6 |
| 16 | Owyhee County | 15.1 | Very Low | 6 |
| 17 | Fremont County | 14.7 | Very Low | 14 |
| 18 | Cassia County | 10.9 | Very Low | 7 |
| 19 | Power County | 10.1 | Very Low | 7 |
| 20 | Caribou County | 9.8 | Very Low | 18 |
| 21 | Minidoka County | 9.6 | Very Low | 7 |
| 22 | Idaho County | 9.3 | Very Low | 12 |
| 23 | Lewis County | 8.6 | Very Low | 8 |
| 24 | Nez Perce County | 8.3 | Very Low | 0 |
| 25 | Jerome County | 7.3 | Very Low | 2 |
| 26 | Clearwater County | 6.9 | Very Low | 5 |
| 27 | Franklin County | 6.1 | Very Low | 6 |
| 28 | Benewah County | 6 | Very Low | 1 |
| 29 | Blaine County | 5.8 | Very Low | 2 |
| 30 | Bonner County | 5.5 | Very Low | 8 |
| 31 | Valley County | 5.2 | Very Low | 1 |
| 32 | Gem County | 5 | Very Low | 1 |
| 33 | Lemhi County | 4.8 | Very Low | 5 |
| 34 | Boise County | 4.5 | Very Low | 2 |
| 35 | Lincoln County | 4 | Very Low | 0 |
| 36 | Adams County | 3.9 | Very Low | 2 |
| 37 | Bear Lake County | 3.8 | Very Low | 4 |
| 38 | Boundary County | 3.8 | Very Low | 2 |
| 39 | Oneida County | 3.1 | Very Low | 1 |
| 40 | Shoshone County | 2.9 | Very Low | 3 |
| 41 | Butte County | 2.7 | Very Low | 3 |
| 42 | Camas County | 2.1 | Very Low | 1 |
| 43 | Custer County | 2.1 | Very Low | 2 |
| 44 | Clark County | 1.7 | 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.
Hail risk nationally:
Other hazard risks in Idaho:
Frequently asked questions
What is the highest hail risk county in Idaho?
Bonneville County, ID has the highest hail risk in Idaho, with a FEMA National Risk Index score of 84.9 out of 100 (rated "Relatively Moderate").
What causes hail risk in Idaho?
Hail risk reflects expected annual losses from damaging hailstones to structures, vehicles, and crops. High scores cluster in the central plains and Front Range — a corridor sometimes called "Hail Alley" — where large-diameter hail is most frequent. Hail causes over $10 billion in US property damage in active years, much of it to roofs, vehicles, and crops.