When to plant lemon balm in Maine
Maine spans USDA zones 5a–6a, so the right time to plant lemon balm shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 25 in Lewiston to May 16 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 | April 26 – May 10 |
| Lewiston | 5b | April 25 | October 19 | April 25 – May 9 |
| Bangor | 5a | May 4 | October 4 | May 4 – May 18 |
| South Portland | 6a | April 26 | October 15 | April 26 – May 10 |
| Auburn | 5b | April 25 | October 19 | April 25 – May 9 |
| Biddeford | 6a | May 9 | October 3 | May 9 – May 23 |
| Sanford | 5b | May 16 | September 30 | May 16 – May 30 |
| Saco | 6a | April 26 | October 15 | April 26 – May 10 |
Lemon Balm in Maine: FAQ
When can I plant lemon balm in Maine?
Across Maine, the time to transplant lemon balm spans roughly April 25 in Lewiston to May 16 in Sanford, each following that city's local frost dates.
Does the lemon balm planting date vary across Maine?
Yes. Maine publishes 13 cities with their own frost dates, so the right lemon balm 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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