Frost dates in Forest Grove, OR
The average last spring frost in Forest Grove is around April 26 and the first fall frost is around October 20. That gives Forest Grove an average growing season of about 177 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 26 |
| Late (90%) | May 18 |
First fall frost
| Early (10%) | September 29 |
|---|---|
| Average (50%) | October 20 |
| Late (90% chance before) | November 10 |