Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Caribou | 4b | May 7 | Oct 1 | 147 |
| Portland | 6a | Apr 26 | Oct 15 | 172 |
| Lewiston | 5b | May 4 | Oct 8 | 157 |
| Bangor | 5a | May 7 | Oct 4 | 150 |
Zones in Maine
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. Maine's last-frost spread is
11 days wide. Use the location nearest you.
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