When to plant boysenberry in Maine
Maine spans USDA zones 5a–6a, so the right time to plant boysenberry shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 28 in Lewiston to April 18 in Sanford — below are local dates for 13 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Portland | 6a | April 26 | October 15 | March 29 – April 12 |
| Lewiston | 5b | April 25 | October 19 | March 28 – April 11 |
| Bangor | 5a | May 4 | October 4 | April 6 – April 20 |
| South Portland | 6a | April 26 | October 15 | March 29 – April 12 |
| Auburn | 5b | April 25 | October 19 | March 28 – April 11 |
| Biddeford | 6a | May 9 | October 3 | April 11 – April 25 |
| Sanford | 5b | May 16 | September 30 | April 18 – May 2 |
| Saco | 6a | April 26 | October 15 | March 29 – April 12 |
Boysenberry in Maine: FAQ
When can I plant boysenberry in Maine?
Across Maine, the time to transplant boysenberry spans roughly March 28 in Lewiston to April 18 in Sanford, each following that city's local frost dates.
Does the boysenberry planting date vary across Maine?
Yes. Maine publishes 13 cities with their own frost dates, so the right boysenberry 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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