Frost Dates & Planting Calendars in Maine
Typical last spring frost, first fall frost, and growing-season length for 21 cities in Maine, based on NOAA 1991–2020 climate normals. Click a city for its full frost-date summary, monthly temperature chart, and 42-crop planting calendar.
| City | Last Spring Frost (typical) | First Fall Frost (typical) | Growing Season | USDA Zone |
|---|---|---|---|---|
| Portland | April 26 | October 15 | 170 days | 6a |
| Lewiston | April 25 | October 19 | 177 days | 5b |
| Bangor | May 4 | October 4 | 152 days | 5a |
| West Scarborough | April 26 | October 15 | 170 days | 6a |
| South Portland | April 26 | October 15 | 170 days | 6a |
| South Portland Gardens | April 26 | October 15 | 170 days | 6a |
| Auburn | April 25 | October 19 | 177 days | 5b |
| Biddeford | May 9 | October 3 | 146 days | 5b |
| Sanford | May 16 | September 30 | 136 days | 5b |
| Saco | May 9 | October 3 | 146 days | 5b |
| Augusta | April 27 | October 16 | 172 days | 5b |
| Westbrook | April 26 | October 15 | 170 days | 5b |
| Waterville | May 2 | October 10 | 159 days | 5b |
| Brunswick | May 2 | October 10 | 160 days | 5b |
| York Beach | May 1 | October 14 | 165 days | 6a |
| Wells Beach Station | May 9 | October 3 | 146 days | 6a |
| Orono | May 1 | October 6 | 157 days | 5a |
| Lisbon | May 15 | October 2 | 139 days | 5b |
| North Bath | May 10 | October 6 | 149 days | 5b |
| Brewer | May 4 | October 4 | 152 days | 5a |
| Presque Isle | May 14 | September 26 | 131 days | 4a |