Cold Wave Risk in Idaho
All Idaho counties ranked by FEMA National Risk Index cold wave score
Cold Wave risk — prolonged spells of dangerously low temperatures — is rated for 44 of 44 Idaho counties in FEMA's National Risk Index. Bonneville County carries the state's highest cold wave score at 93.0, with $12M in expected annual cold wave losses.
1 Idaho county is rated High or Very High for cold wave, and expected annual losses from cold wave total roughly $63M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Cold Wave
| # | County | Cold Wave Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Bonneville County | High | 1.43 / yr | $12M | |
| 2 | Kootenai County | Medium | 1.16 / yr | $7M | |
| 3 | Bannock County | Medium | 0.88 / yr | $8M | |
| 4 | Madison County | Medium | 2.12 / yr | $6M | |
| 5 | Jefferson County | Medium | 2.56 / yr | $6M | |
| 6 | Bingham County | Medium | 1.47 / yr | $4M | |
| 7 | Power County | Medium | 0.70 / yr | $4M | |
| 8 | Bonner County | Medium | 1.42 / yr | $2M | |
| 9 | Latah County | Low | 0.79 / yr | $1M | |
| 10 | Fremont County | Low | 2.35 / yr | $1M | |
| 11 | Ada County | Low | 0.11 / yr | $2M | |
| 12 | Boundary County | Low | 1.42 / yr | $684K | |
| 13 | Minidoka County | Low | 0.73 / yr | $808K | |
| 14 | Blaine County | Low | 0.72 / yr | $884K | |
| 15 | Teton County | Low | 1.90 / yr | $956K | |
| 16 | Cassia County | Low | 0.39 / yr | $823K | |
| 17 | Twin Falls County | Low | 0.24 / yr | $770K | |
| 18 | Butte County | Low | 2.07 / yr | $610K | |
| 19 | Shoshone County | Low | 0.90 / yr | $471K | |
| 20 | Benewah County | Low | 0.83 / yr | $410K | |
| 21 | Lemhi County | Low | 0.96 / yr | $383K | |
| 22 | Custer County | Low | 0.84 / yr | $266K | |
| 23 | Jerome County | Low | 0.21 / yr | $292K | |
| 24 | Caribou County | Low | 0.95 / yr | $476K | |
| 25 | Canyon County | Low | 0.05 / yr | $414K | |
| 26 | Lincoln County | Low | 0.78 / yr | $277K | |
| 27 | Gooding County | Very Low | 0.22 / yr | $262K | |
| 28 | Franklin County | Very Low | 0.50 / yr | $316K | |
| 29 | Nez Perce County | Very Low | 0.23 / yr | $299K | |
| 30 | Bear Lake County | Very Low | 0.76 / yr | $274K | |
| 31 | Clark County | Very Low | 2.58 / yr | $154K | |
| 32 | Elmore County | Very Low | 0.09 / yr | $140K | |
| 33 | Idaho County | Very Low | 0.31 / yr | $82K | |
| 34 | Oneida County | Very Low | 0.40 / yr | $102K | |
| 35 | Owyhee County | Very Low | 0.12 / yr | $44K | |
| 36 | Clearwater County | Very Low | 0.42 / yr | $48K | |
| 37 | Lewis County | Very Low | 0.26 / yr | $56K | |
| 38 | Payette County | Very Low | 0.05 / yr | $69K | |
| 39 | Washington County | Very Low | 0.03 / yr | $41K | |
| 40 | Camas County | Very Low | 0.40 / yr | $45K | |
| 41 | Gem County | Very Low | 0.05 / yr | $34K | |
| 42 | Valley County | Very Low | 0.05 / yr | $24K | |
| 43 | Adams County | Very Low | 0.05 / yr | $18K | |
| 44 | Boise County | Very Low | 0.05 / yr | $13K |
44 Idaho counties with measurable cold wave risk. See the national cold wave ranking or all Idaho counties by overall risk.
Frequently Asked Questions
Which Idaho county has the highest cold wave risk?
Bonneville County has the highest FEMA cold wave risk score in Idaho at 93.0 (High), with $12M in expected annual losses and about 1.43 events per year.
How many Idaho counties face significant cold wave risk?
44 Idaho counties record measurable cold wave risk in FEMA's National Risk Index; 1 of them are rated High or Very High.