New Hampshire landslide risk
Grafton County has the highest landslide risk in New Hampshire, scoring 97.8 out of 100 — rated "Relatively Moderate" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Grafton County | 97.8 | Relatively Moderate | 0 |
| 2 | Hillsborough County | 84.2 | Relatively Low | 0 |
| 3 | Coos County | 81.5 | Relatively Low | 0 |
| 4 | Merrimack County | 81.1 | Relatively Low | 0 |
| 5 | Carroll County | 80.2 | Relatively Low | 0 |
| 6 | Cheshire County | 79.6 | Relatively Low | 0 |
| 7 | Sullivan County | 77 | Relatively Low | 0 |
| 8 | Rockingham County | 72 | Relatively Low | 0 |
| 9 | Belknap County | 71.6 | Relatively Low | 0 |
| 10 | Strafford County | 61.7 | Very Low | 0 |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Landslide risk nationally:
Other hazard risks in New Hampshire:
Frequently asked questions
What is the highest landslide risk county in New Hampshire?
Grafton County, NH has the highest landslide risk in New Hampshire, with a FEMA National Risk Index score of 97.8 out of 100 (rated "Relatively Moderate").
What causes landslide risk in New Hampshire?
Landslide risk covers expected losses from hillslope failures, rockfalls, and debris flows triggered by heavy rainfall, snowmelt, wildfire, or earthquakes. High scores concentrate in the Pacific Northwest, California coastal ranges, Appalachians, and Rocky Mountain foothills, where steep terrain combines with intense precipitation or seismic activity.