Frost dates across New Hampshire
Typical last spring frost, first fall frost, and USDA zone for 4 New Hampshire cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Manchester | Apr 30 | Oct 11 | about 164 days | 6a |
| Nashua | Apr 30 | Oct 12 | about 165 days | 6a |
| Concord | May 14 | Sep 29 | about 138 days | 5b |
| Dover | May 3 | Oct 10 | about 160 days | 6a |
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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