Winter Weather Risk in Idaho
All Idaho counties ranked by FEMA National Risk Index winter weather score
Winter Weather risk — heavy snow, blizzards, and hazardous winter conditions — is rated for 44 of 44 Idaho counties in FEMA's National Risk Index. Ada County carries the state's highest winter weather score at 98.9, with $3M in expected annual winter weather losses.
9 Idaho counties are rated High or Very High for winter weather, and expected annual losses from winter weather total roughly $12M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Winter Weather
| # | County | Winter Weather Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Ada County | Very High | 8.86 / yr | $3M | |
| 2 | Canyon County | Very High | 8.26 / yr | $1M | |
| 3 | Bannock County | High | 24.17 / yr | $997K | |
| 4 | Twin Falls County | High | 11.81 / yr | $779K | |
| 5 | Bingham County | High | 16.48 / yr | $604K | |
| 6 | Blaine County | High | 20.34 / yr | $624K | |
| 7 | Kootenai County | High | 26.82 / yr | $571K | |
| 8 | Bonner County | High | 27.11 / yr | $290K | |
| 9 | Jerome County | High | 9.79 / yr | $228K | |
| 10 | Jefferson County | Medium | 13.69 / yr | $329K | |
| 11 | Minidoka County | Medium | 11.32 / yr | $241K | |
| 12 | Cassia County | Medium | 15.31 / yr | $259K | |
| 13 | Fremont County | Medium | 29.24 / yr | $261K | |
| 14 | Gooding County | Medium | 9.80 / yr | $136K | |
| 15 | Owyhee County | Medium | 12.24 / yr | $83K | |
| 16 | Power County | Medium | 15.58 / yr | $146K | |
| 17 | Elmore County | Medium | 13.43 / yr | $163K | |
| 18 | Boundary County | Medium | 27.10 / yr | $96K | |
| 19 | Madison County | Medium | 21.27 / yr | $134K | |
| 20 | Bonneville County | Medium | 24.32 / yr | $150K | |
| 21 | Teton County | Medium | 29.81 / yr | $134K | |
| 22 | Franklin County | Medium | 20.64 / yr | $142K | |
| 23 | Shoshone County | Medium | 35.84 / yr | $84K | |
| 24 | Valley County | Low | 20.03 / yr | $92K | |
| 25 | Caribou County | Low | 28.46 / yr | $109K | |
| 26 | Payette County | Low | 8.26 / yr | $105K | |
| 27 | Bear Lake County | Low | 27.03 / yr | $106K | |
| 28 | Gem County | Low | 11.81 / yr | $74K | |
| 29 | Boise County | Low | 17.70 / yr | $70K | |
| 30 | Washington County | Low | 15.46 / yr | $51K | |
| 31 | Lincoln County | Low | 11.35 / yr | $61K | |
| 32 | Custer County | Low | 20.28 / yr | $40K | |
| 33 | Adams County | Low | 19.64 / yr | $39K | |
| 34 | Idaho County | Low | 47.65 / yr | $37K | |
| 35 | Benewah County | Low | 30.25 / yr | $36K | |
| 36 | Oneida County | Low | 16.35 / yr | $55K | |
| 37 | Clearwater County | Low | 40.16 / yr | $25K | |
| 38 | Butte County | Low | 12.70 / yr | $32K | |
| 39 | Lemhi County | Very Low | 27.98 / yr | $17K | |
| 40 | Clark County | Very Low | 26.60 / yr | $15K | |
| 41 | Latah County | Very Low | 27.55 / yr | $15K | |
| 42 | Camas County | Very Low | 14.73 / yr | $11K | |
| 43 | Nez Perce County | Very Low | 12.51 / yr | $5K | |
| 44 | Lewis County | Very Low | 19.95 / yr | $1K |
44 Idaho counties with measurable winter weather risk. See the national winter weather ranking or all Idaho counties by overall risk.
Frequently Asked Questions
Which Idaho county has the highest winter weather risk?
Ada County has the highest FEMA winter weather risk score in Idaho at 98.9 (Very High), with $3M in expected annual losses and about 8.86 events per year.
How many Idaho counties face significant winter weather risk?
44 Idaho counties record measurable winter weather risk in FEMA's National Risk Index; 9 of them are rated High or Very High.