Frost dates in Wilsonville, OR
The average last spring frost in Wilsonville is around April 14 and the first fall frost is around October 31. That gives Wilsonville an average growing season of about 200 days.
Last spring frost
| Early (10% chance after) | March 18 |
|---|---|
| Average (50%) | April 14 |
| Late (90%) | May 7 |
First fall frost
| Early (10%) | October 10 |
|---|---|
| Average (50%) | October 31 |
| Late (90% chance before) | November 22 |