Idaho winter weather risk
Ada County has the highest winter weather risk in Idaho, scoring 98.9 out of 100 — rated "Very High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Ada County | 98.9 | Very High | 0 |
| 2 | Canyon County | 97 | Very High | 0 |
| 3 | Bannock County | 96.1 | Relatively High | 0 |
| 4 | Twin Falls County | 95.2 | Relatively High | 0 |
| 5 | Bingham County | 93.4 | Relatively High | 0 |
| 6 | Blaine County | 93.1 | Relatively High | 0 |
| 7 | Kootenai County | 92.7 | Relatively High | 0 |
| 8 | Bonner County | 86.5 | Relatively High | 0 |
| 9 | Jerome County | 86.3 | Relatively High | 0 |
| 10 | Jefferson County | 82.7 | Relatively Moderate | 0 |
| 11 | Minidoka County | 82.3 | Relatively Moderate | 0 |
| 12 | Cassia County | 81.9 | Relatively Moderate | 0 |
| 13 | Fremont County | 78.5 | Relatively Moderate | 0 |
| 14 | Gooding County | 71.5 | Relatively Moderate | 0 |
| 15 | Owyhee County | 71.2 | Relatively Moderate | 0 |
| 16 | Power County | 70.9 | Relatively Moderate | 0 |
| 17 | Elmore County | 69.6 | Relatively Moderate | 0 |
| 18 | Boundary County | 68.4 | Relatively Moderate | 0 |
| 19 | Madison County | 67.9 | Relatively Moderate | 0 |
| 20 | Bonneville County | 66.2 | Relatively Moderate | 0 |
| 21 | Teton County | 64.6 | Relatively Moderate | 0 |
| 22 | Franklin County | 64.3 | Relatively Moderate | 0 |
| 23 | Shoshone County | 61.9 | Relatively Moderate | 0 |
| 24 | Valley County | 59.1 | Relatively Low | 0 |
| 25 | Caribou County | 58.6 | Relatively Low | 0 |
| 26 | Payette County | 58.3 | Relatively Low | 0 |
| 27 | Bear Lake County | 55 | Relatively Low | 0 |
| 28 | Gem County | 53.9 | Relatively Low | 0 |
| 29 | Boise County | 51.9 | Relatively Low | 0 |
| 30 | Lincoln County | 51.6 | Relatively Low | 0 |
| 31 | Washington County | 51.6 | Relatively Low | 0 |
| 32 | Custer County | 50.4 | Relatively Low | 0 |
| 33 | Adams County | 41 | Relatively Low | 0 |
| 34 | Idaho County | 40.5 | Relatively Low | 0 |
| 35 | Benewah County | 37.2 | Relatively Low | 0 |
| 36 | Oneida County | 37.1 | Relatively Low | 0 |
| 37 | Clearwater County | 34 | Relatively Low | 0 |
| 38 | Butte County | 33.1 | Relatively Low | 0 |
| 39 | Lemhi County | 21.9 | Very Low | 0 |
| 40 | Clark County | 14.6 | Very Low | 0 |
| 41 | Latah County | 14.3 | Very Low | 0 |
| 42 | Camas County | 14.2 | Very Low | 0 |
| 43 | Nez Perce County | 5.5 | Very Low | 0 |
| 44 | Lewis County | 2.8 | 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.
Winter Weather risk nationally:
Other hazard risks in Idaho:
Frequently asked questions
What is the highest winter weather risk county in Idaho?
Ada County, ID has the highest winter weather risk in Idaho, with a FEMA National Risk Index score of 98.9 out of 100 (rated "Very High").
How many counties in Idaho are rated Very High for winter weather risk?
2 of 44 scored Idaho counties are rated "Very High" for winter weather risk by FEMA's National Risk Index.
What causes winter weather risk in Idaho?
Winter weather risk captures expected losses from heavy snow, blizzards, and mixed precipitation. Highest scores appear in the Great Lakes snowbelt, northern Rockies, and interior Northeast, where lake-effect and orographic snowfall is frequent. Winter weather impacts transportation networks, utilities, agriculture, and population health.