When to plant radicchio in New Hampshire
New Hampshire spans USDA zones 5a–6a, so the right time to plant radicchio shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 15 in Nashua to April 30 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 | April 16 – April 30 |
| Nashua | 6a | April 29 | October 8 | April 15 – April 29 |
| Concord | 5b | May 8 | October 3 | April 24 – May 8 |
| Dover | 6a | May 3 | October 10 | April 19 – May 3 |
| Rochester | 6a | April 30 | October 9 | April 16 – April 30 |
| Keene | 5b | May 14 | October 1 | April 30 – May 14 |
| Portsmouth | 6a | May 4 | October 8 | April 20 – May 4 |
| Derry | 6a | April 30 | October 11 | April 16 – April 30 |
Radicchio in New Hampshire: FAQ
When can I plant radicchio in New Hampshire?
Across New Hampshire, the time to transplant radicchio spans roughly April 15 in Nashua to April 30 in Keene, each following that city's local frost dates.
Does the radicchio planting date vary across New Hampshire?
Yes. New Hampshire publishes 15 cities with their own frost dates, so the right radicchio 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 radicchio take to grow in New Hampshire?
Radicchio takes about 60–90 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
Never miss a window in your area
An email when it’s time to start seeds, transplant, and sow — timed to your frost dates. Double opt-in, one-click unsubscribe, no spam.