Bonneville County, Idaho: hazard risk
FEMA rates Bonneville County's overall risk Relatively Moderate (score 82.4 of 100, higher than 82% of rated U.S. counties); 3 of its 15 hazards are rated Relatively High or Very High, led by avalanche, cold wave, lightning. Its storm record holds 929 events since 1950.
FEMA's rating for each hazard
These are FEMA's county-wide model ratings and this county's storm record. They are not an assessment of any property, address or building, and not insurance advice: a property's risk depends on its own elevation, construction and location.
FEMA gives each hazard its own rating, and a rating does not follow the score from one hazard to the next: a hazard with a higher score can carry a lower rating than another. The table sorts by FEMA's rating, then by score (0 to 100, the county against every other county for that hazard).
| Hazard | Risk rating | Score | Expected annual loss |
|---|---|---|---|
| Avalanche | Relatively High | 94.2 | $3.8M |
| Cold Wave | Relatively High | 93.0 | $12M |
| Lightning | Relatively High | 89.5 | $1.5M |
| Landslide | Relatively Moderate | 94.2 | $142K |
| Earthquake | Relatively Moderate | 94.2 | $16M |
| Wildfire | Relatively Moderate | 90.3 | $1.9M |
| Hail | Relatively Moderate | 84.9 | $1.6M |
| Heat Wave | Relatively Moderate | 81.2 | $2.1M |
| Riverine Flooding | Relatively Moderate | 78.6 | $24M |
| Winter Weather | Relatively Moderate | 66.2 | $150K |
| Strong Wind | Relatively Low | 43.9 | $612K |
| Volcanic Activity | Very Low | 72.3 | $163 |
| Ice Storm | Very Low | 26.8 | $35K |
| Drought | Very Low | 19.4 | $5K |
| Tornado | Very Low | 16.2 | $217K |
Source: FEMA National Risk Index, December 2025 release. A model of future loss, not a count of past events. FEMA's National Risk Index map.
What the record holds
| Hazard | Records | Deaths | Damage | Rank in state | Rank in U.S. |
|---|---|---|---|---|---|
| Winter storms | 397 | 7 | $2.2M | 17th of 44 | 1069th of 3,077 |
| High wind and dust storms | 172 | 0 | $6.2M | 4th of 44 | 629th of 3,080 |
| Severe thunderstorm wind | 133 | 1 | $420K | 8th of 44 | 2584th of 3,080 |
| Wildfires | 57 | 0 | $607M | 10th of 44 | 74th of 2,972 |
| Hail | 44 | 0 | $35M | 16th of 44 | 2749th of 3,080 |
| Extreme cold | 41 | 1 | – | 6th of 44 | 1488th of 3,076 |
| Floods | 28 | 0 | $1.2M | 16th of 44 | 2592nd of 3,080 |
| Landslides and avalanches | 10 | 9 | – | 12th of 44 | 144th of 2,278 |
| Heat | 9 | 1 | – | 9th of 44 | 2002nd of 3,076 |
| Heavy rain | 8 | 0 | $7.5M | 24th of 44 | 1886th of 3,080 |
| Lightning | 8 | 0 | $840K | 6th of 44 | 1352nd of 3,080 |
| Tornadoes | 6 | 0 | $12M | 21st of 44 | 2729th of 3,080 |
| Drought | 4 | 0 | – | 12th of 44 | 2438th of 3,063 |
Source: NOAA NCEI Storm Events Database, 1950 to 2026-06-30; damage in 2025 dollars. Search the record at NCEI.
The full Bonneville County record: every hazard by year and month, the deadliest events and FEMA's declarations.