New Hampshire wildfire risk
Hillsborough County has the highest wildfire risk in New Hampshire, scoring 67 out of 100 — rated "Relatively Low" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Hillsborough County | 67 | Relatively Low | 0 |
| 2 | Rockingham County | 47.8 | Very Low | 0 |
| 3 | Merrimack County | 35.2 | Very Low | 0 |
| 4 | Strafford County | 34.5 | Very Low | 0 |
| 5 | Carroll County | 33.6 | Very Low | 0 |
| 6 | Grafton County | 30.9 | Very Low | 0 |
| 7 | Belknap County | 25.3 | Very Low | 0 |
| 8 | Cheshire County | 24.5 | Very Low | 0 |
| 9 | Coos County | 16.4 | Very Low | 0 |
| 10 | Sullivan County | 13.7 | 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.
Wildfire risk nationally:
Other hazard risks in New Hampshire:
Frequently asked questions
What is the highest wildfire risk county in New Hampshire?
Hillsborough County, NH has the highest wildfire risk in New Hampshire, with a FEMA National Risk Index score of 67 out of 100 (rated "Relatively Low").
What causes wildfire risk in New Hampshire?
Wildfire risk reflects expected annual losses to buildings, population, and agriculture from wildfire, adjusted for social vulnerability and community resilience. High scores cluster in the western US, where dry climate, fuel loads, and seasonal wind patterns combine with rapid suburban development into fire-prone terrain.