Frost dates in South Portland, ME
The average last spring frost in South Portland is around May 5 and the first fall frost is around October 7. That gives South Portland an average growing season of about 155 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 5 |
| Late (90%) | May 20 |
First fall frost
| Early (10%) | September 21 |
|---|---|
| Average (50%) | October 7 |
| Late (90% chance before) | October 20 |