When to plant zucchini in New Hampshire
New Hampshire spans USDA zones 5a–6a, so the right time to plant zucchini shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 6 in Nashua to May 21 in Keene — below are local dates for 15 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Manchester | 6a | April 30 | October 11 | May 7 – May 14 |
| Nashua | 6a | April 29 | October 8 | May 6 – May 13 |
| Concord | 5b | May 8 | October 3 | May 15 – May 22 |
| Dover | 6a | May 3 | October 10 | May 10 – May 17 |
| Rochester | 6a | April 30 | October 9 | May 7 – May 14 |
| Keene | 5b | May 14 | October 1 | May 21 – May 28 |
| Portsmouth | 6a | May 4 | October 8 | May 11 – May 18 |
| Derry | 6a | April 30 | October 11 | May 7 – May 14 |
Zucchini in New Hampshire: FAQ
When can I plant zucchini in New Hampshire?
Across New Hampshire, the time to transplant zucchini spans roughly May 6 in Nashua to May 21 in Keene, each following that city's local frost dates.
Does the zucchini planting date vary across New Hampshire?
Yes. New Hampshire publishes 15 cities with their own frost dates, so the right zucchini planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does zucchini take to grow in New Hampshire?
Zucchini takes about 45–60 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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