Grand Isle County
Vermont — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 2th
Grand Isle County faces very low composite natural disaster risk (NRI Risk Index score 1.9, 2th national percentile), driven primarily by ice storm and hurricane exposure. Expected annual loss across all 18 hazard types is $4M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Ice Storm | Low | 0.49 / yr | $81K |
| Hurricane | Very Low | 0.02 / yr | $40K |
| Earthquake | Very Low | 0.00 / yr | $161K |
| Lightning | Very Low | 22.47 / yr | $144K |
| Winter Weather | Very Low | 13.84 / yr | $31K |
| Heat Wave | Very Low | 2.16 / yr | $60K |
| Riverine Flood | Very Low | 0.43 / yr | $3M |
| Strong Wind | Very Low | 0.62 / yr | $172K |
| Landslide | Very Low | 0.02 / yr | $37 |
| Cold Wave | Very Low | 3.05 / yr | $90K |
| Tornado | Very Low | 0.01 / yr | $35K |
| Wildfire | Very Low | 0.00 / yr | $3K |
| Hail | Very Low | 0.89 / yr | $5K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Grand Isle County?
Grand Isle County has a composite FEMA National Risk Index score of 1.9 out of 100, placing it in the Very Low category and the 2th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Grand Isle County?
The three highest-rated hazards are Ice Storm (Low, $81K EAL), Hurricane (Very Low, $40K EAL), Earthquake (Very Low, $161K EAL). These account for most of the county's expected annual losses.
How does Grand Isle County compare to other Vermont counties?
Grand Isle County ranks #14 of 14 Vermont 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. Grand Isle County's $4M EAL is a statistical average, not a guarantee for any specific year or address.