Frost dates in Mount Vernon, OR
The average last spring frost in Mount Vernon is around May 19 and the first fall frost is around September 20. That gives Mount Vernon an average growing season of about 124 days.
Last spring frost
| Early (10% chance after) | May 2 |
|---|---|
| Average (50%) | May 19 |
| Late (90%) | June 9 |
First fall frost
| Early (10%) | September 6 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 11 |