New Hampshire natural disaster risk
New Hampshire ranks #23 of 51 from the lowest population-weighted county-score mean in our state comparison. Its highest hazard-score means are ice storm, riverine flooding, hurricane.
RelocateMath computes these state means by weighting FEMA county scores by population. A mean of county percentiles is not a national state percentile or an official FEMA state rating.
The vertical line marks county-score scale midpoint (50).
Find your county's risk in New Hampshire
All 10 county rows with a FEMA score are available below, initially ordered by population.
| County | Population | Risk score | FEMA rating |
|---|---|---|---|
| Hillsborough County | 426,378 | 89.8 | Relatively Moderate |
| Rockingham County | 319,082 | 85.8 | Relatively Moderate |
| Merrimack County | 155,967 | 78.2 | Relatively Low |
| Strafford County | 132,575 | 64.1 | Relatively Low |
| Grafton County | 92,120 | 81.8 | Relatively Moderate |
| Cheshire County | 77,297 | 60.5 | Relatively Low |
| Belknap County | 64,659 | 57.4 | Relatively Low |
| Carroll County | 51,804 | 71.0 | Relatively Low |
| Sullivan County | 43,715 | 37.6 | Very Low |
| Coos County | 31,271 | 72.8 | Relatively Low |
The county rows show FEMA's own county percentile scores and rating categories; the state figures above are our weighted means. County data cannot establish a property's safety. Expected loss is modeled annual loss per resident, not a premium quote. The insurance figure is what owners with a mortgage reported paying in 2024 (Census American Community Survey), not a current quote. For a specific home, check the address on FEMA's flood map and get insurance quotes before you commit. Our guide explains how to check natural disaster risk before you move.
Lowest FEMA county risk scores in New Hampshire
- Sullivan County 37.6
- Belknap County 57.4
- Cheshire County 60.5
- Strafford County 64.1
- Carroll County 71.0
- Coos County 72.8
- Merrimack County 78.2
- Grafton County 81.8
Cities in New Hampshire
- Boston, MA county-score mean 93.2
- Manchester, NH county-score mean 89.8
Frequently asked questions
Is New Hampshire safe from natural disasters?
New Hampshire's population-weighted county-score mean is 78.8 out of 100 (high county-score mean), #23 of 51 from the lowest mean in our state comparison. A state average cannot show whether an individual home is safe. No residents in this dataset live in counties FEMA rates relatively high or very high.
What natural disasters happen in New Hampshire?
The highest population-weighted county hazard-score means in New Hampshire are ice storm, riverine flooding, hurricane (means 89, 86, 84 on the 0–100 county-score scale). These are not national state percentiles.
Which counties have the lowest modeled risk scores in New Hampshire?
Among counties with at least 20,000 people, the lowest FEMA county risk scores are in Sullivan County, Belknap County, Cheshire County. Conditions vary within each county; check an individual address separately.