Idaho Natural Disaster Risk by County
FEMA National Risk Index rankings for all 44 counties
Idaho spans 44 counties with an average FEMA National Risk Index score of 38.5 (low risk) and roughly $767M in combined expected annual loss statewide. No county in the state reaches the High risk band.
Topping the rankings is Ada County (score 87.8, medium), while Clark County (score 0.8) carries the lowest. Use the table below to compare every county by score, top hazard, and expected annual loss.
County Rankings
| # | County | Risk Score | Risk Rating | Top Hazard | Ann. Loss |
|---|---|---|---|---|---|
| 1 | Ada County | Medium | Winter Weather | $116M | |
| 2 | Bonneville County | Medium | Avalanche | $65M | |
| 3 | Kootenai County | Low | Landslide | $45M | |
| 4 | Idaho County | Low | Landslide | $31M | |
| 5 | Bonner County | Low | Avalanche | $35M | |
| 6 | Canyon County | Low | Winter Weather | $36M | |
| 7 | Bannock County | Low | Wildfire | $31M | |
| 8 | Blaine County | Low | Avalanche | $28M | |
| 9 | Shoshone County | Low | Landslide | $20M | |
| 10 | Bingham County | Low | Winter Weather | $23M | |
| 11 | Madison County | Low | Lightning | $22M | |
| 12 | Valley County | Low | Wildfire | $20M | |
| 13 | Custer County | Low | Landslide | $11M | |
| 14 | Elmore County | Low | Wildfire | $22M | |
| 15 | Boise County | Low | Landslide | $16M | |
| 16 | Clearwater County | Low | Landslide | $10M | |
| 17 | Twin Falls County | Low | Winter Weather | $17M | |
| 18 | Owyhee County | Low | Wildfire | $8M | |
| 19 | Cassia County | Low | Wildfire | $16M | |
| 20 | Lemhi County | Very Low | Landslide | $11M | |
| 21 | Jefferson County | Very Low | Winter Weather | $17M | |
| 22 | Adams County | Very Low | Wildfire | $10M | |
| 23 | Fremont County | Very Low | Avalanche | $16M | |
| 24 | Gem County | Very Low | Wildfire | $11M | |
| 25 | Latah County | Very Low | Wildfire | $13M | |
| 26 | Nez Perce County | Very Low | Wildfire | $15M | |
| 27 | Washington County | Very Low | Wildfire | $7M | |
| 28 | Teton County | Very Low | Avalanche | $12M | |
| 29 | Boundary County | Very Low | Landslide | $7M | |
| 30 | Gooding County | Very Low | Wildfire | $8M | |
| 31 | Jerome County | Very Low | Wildfire | $6M | |
| 32 | Minidoka County | Very Low | Winter Weather | $8M | |
| 33 | Benewah County | Very Low | Landslide | $6M | |
| 34 | Payette County | Very Low | Wildfire | $8M | |
| 35 | Power County | Very Low | Wildfire | $7M | |
| 36 | Lincoln County | Very Low | Wildfire | $4M | |
| 37 | Franklin County | Very Low | Wildfire | $5M | |
| 38 | Caribou County | Very Low | Wildfire | $5M | |
| 39 | Bear Lake County | Very Low | Avalanche | $5M | |
| 40 | Camas County | Very Low | Avalanche | $3M | |
| 41 | Butte County | Very Low | Avalanche | $3M | |
| 42 | Lewis County | Very Low | Wildfire | $2M | |
| 43 | Oneida County | Very Low | Wildfire | $2M | |
| 44 | Clark County | Very Low | Avalanche | $1M |
All 44 Idaho counties, ranked by FEMA National Risk Index score.
Frequently Asked Questions
Which Idaho county has the highest natural disaster risk?
Ada County has the highest FEMA National Risk Index score in Idaho at 87.8 (Medium), driven largely by winter weather.
What is the average natural disaster risk in Idaho?
Idaho counties average a National Risk Index score of 38.5 across 44 counties, with 0 rated High or Very High risk.
How much are expected annual losses across Idaho?
FEMA estimates roughly $767M in combined expected annual loss from natural hazards across all Idaho counties.