Idaho Natural Disaster Risk by County
Of Idaho's 44 counties, 0 have a Very High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025); the highest is Ada County (score 87.8 of 100), and expected losses across the state total $767 million a year.
OpenFEMA lists 59 federal disaster, emergency and fire management declarations for Idaho since 1956 (not counting COVID-19); the latest is FM-5660-ID, Tartar Fire, declared 2 August 2026.
Live weather alerts for Idaho Latest FEMA declarations All official warnings
Most exposed counties, hazard by hazard
Top 10 by FEMA hazard risk scoreTornado 44 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Ada County | Relatively Low | $686,018 |
| 2 | Kootenai County | Very Low | $318,470 |
| 3 | Canyon County | Very Low | $300,436 |
| 4 | Bonneville County | Very Low | $217,323 |
| 5 | Bannock County | Very Low | $176,681 |
| 6 | Twin Falls County | Very Low | $126,709 |
| 7 | Teton County | Very Low | $92,044 |
| 8 | Bonner County | Very Low | $64,678 |
| 9 | Madison County | Very Low | $69,862 |
| 10 | Cassia County | Very Low | $70,274 |
Inland flooding 44 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Ada County | Relatively Moderate | $63 million |
| 2 | Bonner County | Relatively Moderate | $28 million |
| 3 | Kootenai County | Relatively Moderate | $32 million |
| 4 | Canyon County | Relatively Moderate | $24 million |
| 5 | Bonneville County | Relatively Moderate | $24 million |
| 6 | Shoshone County | Relatively Moderate | $15 million |
| 7 | Idaho County | Relatively Low | $12 million |
| 8 | Blaine County | Relatively Low | $15 million |
| 9 | Lemhi County | Relatively Low | $7.9 million |
| 10 | Bingham County | Relatively Low | $9.4 million |
Wildfire 44 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Idaho County | Relatively High | $17 million |
| 2 | Ada County | Relatively High | $27 million |
| 3 | Elmore County | Relatively High | $13 million |
| 4 | Valley County | Relatively Moderate | $9.1 million |
| 5 | Boise County | Relatively Moderate | $8.2 million |
| 6 | Bannock County | Relatively Moderate | $8.6 million |
| 7 | Adams County | Relatively Moderate | $5.4 million |
| 8 | Gem County | Relatively Moderate | $5.9 million |
| 9 | Clearwater County | Relatively Moderate | $3.9 million |
| 10 | Owyhee County | Relatively Moderate | $2.7 million |
Earthquake 44 rated
| # | County | Rating | Loss a year |
|---|---|---|---|
| 1 | Bonneville County | Relatively Moderate | $16 million |
| 2 | Bingham County | Relatively Low | $4.4 million |
| 3 | Ada County | Relatively Low | $6.6 million |
| 4 | Madison County | Relatively Low | $4.0 million |
| 5 | Fremont County | Relatively Low | $3.0 million |
| 6 | Bannock County | Relatively Low | $2.6 million |
| 7 | Jefferson County | Relatively Low | $2.4 million |
| 8 | Custer County | Relatively Low | $950,700 |
| 9 | Kootenai County | Relatively Low | $1.7 million |
| 10 | Canyon County | Relatively Low | $1.7 million |
Every Idaho county, highest overall risk first
44| # | County | Overall risk | Score | Loss a year | Top hazard | Declarations | Tornadoes |
|---|---|---|---|---|---|---|---|
| 1 | Ada County | Relatively Moderate | 87.8 | $116 million | Winter weather | 4 | 13 |
| 2 | Bonneville County | Relatively Moderate | 82.4 | $65 million | Avalanche | 5 | 6 |
| 3 | Kootenai County | Relatively Low | 79.0 | $45 million | Landslide | 16 | 2 |
| 4 | Idaho County | Relatively Low | 78.4 | $31 million | Landslide | 16 | 2 |
| 5 | Bonner County | Relatively Low | 77.3 | $35 million | Avalanche | 16 | 4 |
| 6 | Canyon County | Relatively Low | 71.7 | $36 million | Winter weather | 2 | 6 |
| 7 | Bannock County | Relatively Low | 66.9 | $31 million | Wildfire | 3 | 7 |
| 8 | Blaine County | Relatively Low | 65.4 | $28 million | Avalanche | 8 | 7 |
| 9 | Shoshone County | Relatively Low | 62.8 | $20 million | Landslide | 14 | 1 |
| 10 | Bingham County | Relatively Low | 60.1 | $23 million | Winter weather | 5 | 20 |
| 11 | Madison County | Relatively Low | 58.6 | $22 million | Lightning | 3 | 6 |
| 12 | Valley County | Relatively Low | 55.6 | $20 million | Wildfire | 10 | 0 |
| 13 | Custer County | Relatively Low | 52.4 | $11 million | Landslide | 5 | 2 |
| 14 | Elmore County | Relatively Low | 52.0 | $22 million | Wildfire | 9 | 5 |
| 15 | Boise County | Relatively Low | 48.9 | $16 million | Landslide | 5 | 0 |
| 16 | Twin Falls County | Relatively Low | 46.9 | $17 million | Winter weather | 2 | 12 |
| 17 | Clearwater County | Relatively Low | 46.9 | $10 million | Landslide | 13 | 1 |
| 18 | Owyhee County | Relatively Low | 44.1 | $8.5 million | Wildfire | 4 | 5 |
| 19 | Cassia County | Relatively Low | 43.6 | $16 million | Wildfire | 3 | 10 |
| 20 | Lemhi County | Very Low | 41.4 | $11 million | Landslide | 3 | 3 |
| 21 | Jefferson County | Very Low | 40.1 | $17 million | Winter weather | 4 | 19 |
| 22 | Adams County | Very Low | 39.6 | $10 million | Wildfire | 7 | 3 |
| 23 | Fremont County | Very Low | 38.3 | $16 million | Avalanche | 3 | 5 |
| 24 | Gem County | Very Low | 34.4 | $11 million | Wildfire | 5 | 2 |
| 25 | Latah County | Very Low | 33.3 | $13 million | Wildfire | 14 | 4 |
| 26 | Nez Perce County | Very Low | 33.0 | $15 million | Wildfire | 13 | 3 |
| 27 | Washington County | Very Low | 30.3 | $7.5 million | Wildfire | 8 | 3 |
| 28 | Teton County | Very Low | 29.5 | $12 million | Avalanche | 1 | 1 |
| 29 | Boundary County | Very Low | 26.1 | $6.8 million | Landslide | 10 | 0 |
| 30 | Gooding County | Very Low | 25.4 | $8.4 million | Wildfire | 5 | 6 |
| 31 | Jerome County | Very Low | 21.5 | $5.8 million | Wildfire | 4 | 6 |
| 32 | Minidoka County | Very Low | 20.5 | $7.6 million | Winter weather | 3 | 6 |
| 33 | Benewah County | Very Low | 19.9 | $6.4 million | Landslide | 14 | 0 |
| 34 | Payette County | Very Low | 17.1 | $8.0 million | Wildfire | 4 | 2 |
| 35 | Power County | Very Low | 16.9 | $7.1 million | Wildfire | 3 | 17 |
| 36 | Lincoln County | Very Low | 9.1 | $4.0 million | Wildfire | 5 | 4 |
| 37 | Franklin County | Very Low | 7.6 | $5.4 million | Wildfire | 2 | 3 |
| 38 | Caribou County | Very Low | 7.2 | $4.9 million | Wildfire | 3 | 4 |
| 39 | Bear Lake County | Very Low | 6.6 | $4.9 million | Avalanche | 2 | 2 |
| 40 | Camas County | Very Low | 6.0 | $3.1 million | Avalanche | 6 | 4 |
| 41 | Butte County | Very Low | 4.4 | $2.7 million | Avalanche | 4 | 8 |
| 42 | Lewis County | Very Low | 3.1 | $2.0 million | Wildfire | 10 | 1 |
| 43 | Oneida County | Very Low | 1.4 | $2.1 million | Wildfire | 1 | 3 |
| 44 | Clark County | Very Low | 0.8 | $1.4 million | Avalanche | 2 | 8 |
Score: FEMA's national percentile (higher = more risk). Declarations: federal declarations that named the county since 1953, not counting COVID-19. Tornadoes: NOAA SPC tornadoes that touched the county, 1950–2025.
Latest federal declarations in Idaho
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What this page shows, and what it misses
FEMA's National Risk Index compares every US county with every other for 18 natural hazards, combining expected losses with social vulnerability and community resilience. It is a planning-level estimate for nationwide comparison, not a flood-zone map and not the risk to any one property — for flood zones use FEMA's Flood Map Service Center ↗. Federal declarations exclude state declarations and SBA or USDA designations.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Idaho
Which county in Idaho has the highest natural disaster risk?
Of Idaho's 44 counties, 0 have a Very High natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025); the highest is Ada County (score 87.8 of 100), and expected losses across the state total $767 million a year.
Which Idaho counties are most at risk from tornadoes?
By FEMA's National Risk Index tornado risk score: Ada County, Kootenai County, Canyon County. These are planning-level estimates for whole counties, not maps of individual properties.
Which Idaho counties are most at risk from inland flooding?
By FEMA's National Risk Index inland flooding risk score: Ada County, Bonner County, Kootenai County. These are planning-level estimates for whole counties, not maps of individual properties.
How many FEMA disaster declarations has Idaho had?
OpenFEMA lists 59 federal disaster, emergency and fire management declarations for Idaho since 1956 (not counting COVID-19); the latest is FM-5660-ID, Tartar Fire, declared 2 August 2026.