544
Recorded events
10
Counties affected
2
Direct deaths
$50.5M
Property damage
New Hampshire flood history: 544 recorded events across 10 counties between 1996 and 2026.
Decade by decade
New Hampshire flood history by decade
The 2010s are the busiest decade on record with 215 reported flood events across New Hampshire. Earlier decades are thinner because systematic reporting for this hazard expanded over time, not because the weather was calmer.
County ranking
Counties with the most flood events in New Hampshire
| Rank | County | Events | Deaths | Damage | Span |
|---|---|---|---|---|---|
| #1 | Grafton County | 110 | 0 | $10.2M | 2006–2026 |
| #2 | Merrimack County | 73 | 0 | $5.0M | 2006–2025 |
| #3 | Coos County | 51 | 0 | $3.7M | 1996–2023 |
| #4 | Carroll County | 51 | 0 | $2.8M | 2006–2026 |
| #5 | Hillsborough County | 31 | 0 | $3.7M | 1997–2025 |
| #6 | Sullivan County | 26 | 0 | $1.9M | 2006–2023 |
| #7 | Rockingham County | 20 | 0 | $11.2M | 2001–2023 |
| #8 | Belknap County | 12 | 0 | $815K | 1999–2023 |
| #9 | Cheshire County | 11 | 0 | $263K | 2007–2023 |
| #10 | Strafford County | 10 | 0 | $2.8M | 2006–2022 |