Maine Frost Dates
Maine has a shorter, cooler growing season than much of the country, especially away from the ocean. Coastal gardens often escape the harshest swings, while inland valleys and northern areas can keep late spring frost around longer and face an earlier end to the season.
Look up your exact frost dates
Frost timing shifts across Maine with elevation and distance from water. Enter your ZIP code for dates from your nearest weather station.
Maine locations
| ZIP | Area | Hardiness zone |
|---|---|---|
| 03902 | Cape Neddick | 6a |
| 04009 | Bridgton | 5a |
| 04102 | Portland | 6a |
| 04106 | South Portland | 6a |
| 04282 | Turner | 5b |
| 04345 | Gardiner | 5b |
| 04424 | Danforth | 4b |
| 04469 | Orono | 5a |
| 04479 | Dover-Foxcroft | 5a |
| 04489 | Old Town | 5a |
| 04553 | Newcastle | 5b |
| 04578 | Wiscasset | 5b |
| 04609 | Bar Harbor | 6a |
| 04631 | Eastport | 6a |
| 04648 | Machias | 5b |
| 04730 | Houlton | 4b |
| 04737 | Eagle Lake | 3b |
| 04750 | Limestone | 4a |
| 04856 | Rockland | 6a |
| 04955 | Farmington | 5a |
| 03579 | Rangeley | 4b |
| 03901 | Berwick | 6a |
| 03903 | South Eliot | 6a |
| 03904 | Kittery | 6a |
| 03905 | Kittery Point | 6b |
| 03906 | Sanford | 5b |
| 03907 | Cape Neddick | 6a |
| 03908 | South Berwick | 6a |
| 03909 | York Harbor | 6a |
| 03910 | Cape Neddick | 6a |
| 03911 | York Harbor | 6a |
| 04001 | Milton Mills | 5b |
| 04002 | Alfred | 5b |
| 04003 | Portland | 6a |
| 04005 | Biddeford | 5b |
| 04006 | Biddeford | - |
| 04008 | Bowdoinham | 5b |
| 04010 | Fryeburg | 5a |
| 04011 | Brunswick | 5b |
| 04015 | Casco | 5b |
| 04017 | Portland | 6a |
| 04019 | Portland | 6a |
| 04020 | Cornish | 5a |
| 04021 | Cumberland Center | 5b |
| 04022 | Bridgton | 5a |
| 04024 | Steep Falls | 5a |
| 04027 | Milton | 5b |
| 04029 | Steep Falls | 5a |
| 04030 | Lake Arrowhead | 5b |
| 04032 | Freeport | 6a |
| 04037 | Fryeburg | 5a |
| 04038 | Gorham | 5b |
| 04039 | Gray | 5b |
| 04040 | Bridgton | 5a |
| 04041 | Cornish | 5a |
| 04042 | Lake Arrowhead | 5b |
| 04043 | Kennebunk | 5b |
| 04046 | Biddeford | 6a |
| 04047 | Kezar Falls | 5b |
| 04048 | Lake Arrowhead | 5a |
Source: NOAA 1991–2020 U.S. Climate Normals (public domain) and USDA 2023 Plant Hardiness Zone Map. Page updated Aug 4, 2026.