Tornado Risk in Idaho
All Idaho counties ranked by FEMA National Risk Index tornado score
Tornado risk — violently rotating columns of air capable of catastrophic local damage — is rated for 44 of 44 Idaho counties in FEMA's National Risk Index. Ada County carries the state's highest tornado score at 27.0, with $686K in expected annual tornado losses.
No Idaho county reaches the High band for tornado, and expected annual losses from tornado total roughly $3M statewide. The full ranking below links to each county's complete 18-hazard risk profile.
County Rankings — Tornado
| # | County | Tornado Score | Rating | Ann. Freq. | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Ada County | Low | 0.06 / yr | $686K | |
| 2 | Kootenai County | Very Low | 0.04 / yr | $318K | |
| 3 | Canyon County | Very Low | 0.03 / yr | $300K | |
| 4 | Bonneville County | Very Low | 0.18 / yr | $217K | |
| 5 | Bannock County | Very Low | 0.12 / yr | $177K | |
| 6 | Twin Falls County | Very Low | 0.13 / yr | $127K | |
| 7 | Teton County | Very Low | 0.02 / yr | $92K | |
| 8 | Bonner County | Very Low | 0.04 / yr | $65K | |
| 9 | Madison County | Very Low | 0.04 / yr | $70K | |
| 10 | Cassia County | Very Low | 0.22 / yr | $70K | |
| 11 | Gooding County | Very Low | 0.06 / yr | $57K | |
| 12 | Latah County | Very Low | 0.03 / yr | $71K | |
| 13 | Jerome County | Very Low | 0.05 / yr | $41K | |
| 14 | Minidoka County | Very Low | 0.09 / yr | $50K | |
| 15 | Bingham County | Very Low | 0.27 / yr | $50K | |
| 16 | Blaine County | Very Low | 0.22 / yr | $46K | |
| 17 | Nez Perce County | Very Low | 0.02 / yr | $56K | |
| 18 | Elmore County | Very Low | 0.19 / yr | $44K | |
| 19 | Jefferson County | Very Low | 0.12 / yr | $47K | |
| 20 | Fremont County | Very Low | 0.11 / yr | $44K | |
| 21 | Payette County | Very Low | 0.02 / yr | $39K | |
| 22 | Owyhee County | Very Low | 0.28 / yr | $17K | |
| 23 | Idaho County | Very Low | 0.10 / yr | $22K | |
| 24 | Gem County | Very Low | 0.03 / yr | $26K | |
| 25 | Washington County | Very Low | 0.06 / yr | $18K | |
| 26 | Power County | Very Low | 0.17 / yr | $25K | |
| 27 | Benewah County | Very Low | 0.03 / yr | $19K | |
| 28 | Shoshone County | Very Low | 0.04 / yr | $11K | |
| 29 | Boise County | Very Low | 0.08 / yr | $13K | |
| 30 | Lincoln County | Very Low | 0.12 / yr | $11K | |
| 31 | Valley County | Very Low | 0.05 / yr | $11K | |
| 32 | Boundary County | Very Low | 0.01 / yr | $8K | |
| 33 | Clearwater County | Very Low | 0.04 / yr | $7K | |
| 34 | Franklin County | Very Low | 0.05 / yr | $11K | |
| 35 | Lemhi County | Very Low | 0.10 / yr | $7K | |
| 36 | Caribou County | Very Low | 0.15 / yr | $10K | |
| 37 | Custer County | Very Low | 0.13 / yr | $4K | |
| 38 | Butte County | Very Low | 0.23 / yr | $7K | |
| 39 | Adams County | Very Low | 0.04 / yr | $5K | |
| 40 | Lewis County | Very Low | 0.01 / yr | $5K | |
| 41 | Oneida County | Very Low | 0.11 / yr | $6K | |
| 42 | Bear Lake County | Very Low | 0.06 / yr | $5K | |
| 43 | Camas County | Very Low | 0.06 / yr | $2K | |
| 44 | Clark County | Very Low | 0.13 / yr | $2K |
44 Idaho counties with measurable tornado risk. See the national tornado ranking or all Idaho counties by overall risk.
Frequently Asked Questions
Which Idaho county has the highest tornado risk?
Ada County has the highest FEMA tornado risk score in Idaho at 27.0 (Low), with $686K in expected annual losses and about 0.06 events per year.
How many Idaho counties face significant tornado risk?
44 Idaho counties record measurable tornado risk in FEMA's National Risk Index; 0 of them are rated High or Very High.