New Hampshire planting zones & frost dates
The 2 New Hampshire cities on this site fall in zone 6a. Last spring frost dates range from May 4 in Manchester to May 4 in Nashua.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Manchester | 6a | May 4 | Oct 6 | 116,386 |
| Nashua | 6a | May 4 | Oct 5 | 91,851 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.