Twin Falls County
Idaho — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 47th
Twin Falls County faces low composite natural disaster risk (NRI Risk Index score 46.9, 47th national percentile), driven primarily by winter weather and wildfire exposure. Expected annual loss across all 18 hazard types is $17M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Winter Weather | High | 11.81 / yr | $779K |
| Wildfire | Medium | 0.02 / yr | $3M |
| Landslide | Medium | 0.29 / yr | $95K |
| Heat Wave | Medium | 3.23 / yr | $2M |
| Earthquake | Low | 0.00 / yr | $1M |
| Ice Storm | Low | 0.05 / yr | $128K |
| Volcanic Activity | Very Low | 0.00 / yr | $22 |
| Lightning | Low | 23.79 / yr | $304K |
| Avalanche | Very Low | 0.01 / yr | $865 |
| Riverine Flood | Low | 0.32 / yr | $8M |
| Cold Wave | Low | 0.24 / yr | $770K |
| Strong Wind | Low | 0.31 / yr | $414K |
| Hail | Very Low | 0.21 / yr | $140K |
| Drought | Very Low | 75.62 / yr | $10K |
| Tornado | Very Low | 0.13 / yr | $127K |
| 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 Twin Falls County?
Twin Falls County has a composite FEMA National Risk Index score of 46.9 out of 100, placing it in the Low category and the 47th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Twin Falls County?
The three highest-rated hazards are Winter Weather (High, $779K EAL), Wildfire (Medium, $3M EAL), Landslide (Medium, $95K EAL). These account for most of the county's expected annual losses.
How does Twin Falls County compare to other Idaho counties?
Twin Falls County ranks #17 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. Twin Falls County's $17M EAL is a statistical average, not a guarantee for any specific year or address.