New Hampshire hail risk
Hillsborough County has the highest hail risk in New Hampshire, scoring 55.4 out of 100 — rated "Relatively Low" by FEMA's National Risk Index. Recorded hail events across New Hampshire have increased 167% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Hillsborough County | 55.4 | Relatively Low | 37 |
| 2 | Merrimack County | 37.2 | Relatively Low | 27 |
| 3 | Rockingham County | 35.5 | Relatively Low | 30 |
| 4 | Cheshire County | 30.4 | Very Low | 44 |
| 5 | Strafford County | 20.3 | Very Low | 7 |
| 6 | Grafton County | 19.2 | Very Low | 31 |
| 7 | Sullivan County | 17.4 | Very Low | 14 |
| 8 | Belknap County | 15.6 | Very Low | 8 |
| 9 | Carroll County | 11.6 | Very Low | 35 |
| 10 | Coos County | 6.1 | Very Low | 24 |
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.
Hail risk nationally:
Other hazard risks in New Hampshire:
Frequently asked questions
What is the highest hail risk county in New Hampshire?
Hillsborough County, NH has the highest hail risk in New Hampshire, with a FEMA National Risk Index score of 55.4 out of 100 (rated "Relatively Low").
What causes hail risk in New Hampshire?
Hail risk reflects expected annual losses from damaging hailstones to structures, vehicles, and crops. High scores cluster in the central plains and Front Range — a corridor sometimes called "Hail Alley" — where large-diameter hail is most frequent. Hail causes over $10 billion in US property damage in active years, much of it to roofs, vehicles, and crops.