When to plant garlic in New Hampshire
New Hampshire spans USDA zones 5a–6a, so the right time to plant garlic shifts by weeks across the state. The window to plant for fall/overwintering runs from about September 3 in Keene to September 20 in Laconia — below are local dates for 15 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Fall-plant |
|---|---|---|---|---|
| Manchester | 6a | April 30 | October 11 | September 13 – September 27 |
| Nashua | 6a | April 29 | October 8 | September 10 – September 24 |
| Concord | 5b | May 8 | October 3 | September 5 – September 19 |
| Dover | 6a | May 3 | October 10 | September 12 – September 26 |
| Rochester | 6a | April 30 | October 9 | September 11 – September 25 |
| Keene | 5b | May 14 | October 1 | September 3 – September 17 |
| Portsmouth | 6a | May 4 | October 8 | September 10 – September 24 |
| Derry | 6a | April 30 | October 11 | September 13 – September 27 |
Garlic in New Hampshire: FAQ
When can I plant garlic in New Hampshire?
Across New Hampshire, the time to fall-plant garlic spans roughly September 3 in Keene to September 20 in Laconia, each following that city's local frost dates.
Does the garlic planting date vary across New Hampshire?
Yes. New Hampshire publishes 15 cities with their own frost dates, so the right garlic planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
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