Frost dates in Portland, IN
The average last spring frost in Portland is around April 25 and the first fall frost is around October 15. That gives Portland an average growing season of about 173 days.
Last spring frost
| Early (10% chance after) | April 11 |
|---|---|
| Average (50%) | April 25 |
| Late (90%) | May 11 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 27 |