When to plant shiso (perilla) in New Hampshire
New Hampshire spans USDA zones 5a–6a, so the right time to plant shiso (perilla) 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 |
Shiso (Perilla) in New Hampshire: FAQ
When can I plant shiso (perilla) in New Hampshire?
Across New Hampshire, the time to transplant shiso (perilla) spans roughly May 6 in Nashua to May 21 in Keene, each following that city's local frost dates.
Does the shiso (perilla) planting date vary across New Hampshire?
Yes. New Hampshire publishes 15 cities with their own frost dates, so the right shiso (perilla) 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 shiso (perilla) take to grow in New Hampshire?
Shiso (Perilla) takes about 70–90 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.