Big Horn County
Wyoming — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 31th
Big Horn County faces very low composite natural disaster risk (NRI Risk Index score 31.1, 31th national percentile), driven primarily by landslide and earthquake exposure. Expected annual loss across all 18 hazard types is $9M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | High | 2.07 / yr | $493K |
| Earthquake | Low | 0.00 / yr | $425K |
| Wildfire | Very Low | 0.00 / yr | $81K |
| Cold Wave | Low | 1.31 / yr | $1M |
| Riverine Flood | Low | 0.89 / yr | $6M |
| Winter Weather | Low | 10.82 / yr | $49K |
| Drought | Low | 85.63 / yr | $54K |
| Lightning | Low | 33.67 / yr | $126K |
| Volcanic Activity | Very Low | 0.00 / yr | $3 |
| Avalanche | Very Low | 0.01 / yr | $110 |
| Hail | Very Low | 0.69 / yr | $88K |
| Tornado | Very Low | 0.24 / yr | $155K |
| Strong Wind | Very Low | 0.42 / yr | $80K |
| Ice Storm | Very Low | 0.01 / yr | $4K |
| Heat Wave | Very Low | 0.22 / yr | $12K |
| 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 Big Horn County?
Big Horn County has a composite FEMA National Risk Index score of 31.1 out of 100, placing it in the Very Low category and the 31th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Big Horn County?
The three highest-rated hazards are Landslide (High, $493K EAL), Earthquake (Low, $425K EAL), Wildfire (Very Low, $81K EAL). These account for most of the county's expected annual losses.
How does Big Horn County compare to other Wyoming counties?
Big Horn County ranks #12 of 23 Wyoming counties for overall natural disaster risk, with a very 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. Big Horn County's $9M EAL is a statistical average, not a guarantee for any specific year or address.