Grafton County
New Hampshire — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 82th
Grafton County faces medium composite natural disaster risk (NRI Risk Index score 81.8, 82th national percentile), driven primarily by landslide and winter weather exposure. Expected annual loss across all 18 hazard types is $50M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | Medium | 3.35 / yr | $544K |
| Winter Weather | High | 22.07 / yr | $608K |
| Riverine Flood | Medium | 4.29 / yr | $43M |
| Lightning | Medium | 19.69 / yr | $828K |
| Hurricane | Low | 0.06 / yr | $2M |
| Ice Storm | Medium | 0.60 / yr | $332K |
| Avalanche | Low | 0.01 / yr | $13K |
| Earthquake | Low | 0.00 / yr | $848K |
| Cold Wave | Low | 3.92 / yr | $1M |
| Strong Wind | Low | 0.79 / yr | $577K |
| Heat Wave | Low | 1.01 / yr | $310K |
| Wildfire | Very Low | 0.00 / yr | $16K |
| Tornado | Very Low | 0.18 / yr | $378K |
| Hail | Very Low | 1.62 / yr | $75K |
| 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 Grafton County?
Grafton County has a composite FEMA National Risk Index score of 81.8 out of 100, placing it in the Medium category and the 82th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Grafton County?
The three highest-rated hazards are Landslide (Medium, $544K EAL), Winter Weather (High, $608K EAL), Riverine Flood (Medium, $43M EAL). These account for most of the county's expected annual losses.
How does Grafton County compare to other New Hampshire counties?
Grafton County ranks #3 of 10 New Hampshire counties for overall natural disaster risk, with a medium 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. Grafton County's $50M EAL is a statistical average, not a guarantee for any specific year or address.