Canyon County
Idaho — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 72th
Canyon County faces low composite natural disaster risk (NRI Risk Index score 71.7, 72th national percentile), driven primarily by winter weather and wildfire exposure. Expected annual loss across all 18 hazard types is $36M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Winter Weather | Very High | 8.26 / yr | $1M |
| Wildfire | Medium | 0.00 / yr | $2M |
| Heat Wave | Medium | 4.53 / yr | $3M |
| Lightning | High | 17.83 / yr | $1M |
| Riverine Flood | Medium | 0.39 / yr | $24M |
| Earthquake | Low | 0.00 / yr | $2M |
| Ice Storm | Medium | 0.09 / yr | $323K |
| Volcanic Activity | Very Low | 0.00 / yr | $110 |
| Strong Wind | Medium | 0.34 / yr | $1M |
| Hail | Low | 0.25 / yr | $273K |
| Landslide | Very Low | 0.06 / yr | $420 |
| Cold Wave | Low | 0.05 / yr | $414K |
| Drought | Very Low | 17.43 / yr | $6K |
| Tornado | Very Low | 0.03 / yr | $300K |
| Avalanche | Very Low | 0.01 / yr | $3 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Canyon County?
Canyon County has a composite FEMA National Risk Index score of 71.7 out of 100, placing it in the Low category and the 72th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Canyon County?
The three highest-rated hazards are Winter Weather (Very High, $1M EAL), Wildfire (Medium, $2M EAL), Heat Wave (Medium, $3M EAL). These account for most of the county's expected annual losses.
How does Canyon County compare to other Idaho counties?
Canyon County ranks #6 of 44 Idaho counties for overall natural disaster risk, with a low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Canyon County's $36M EAL is a statistical average, not a guarantee for any specific year or address.