Frost dates in Vernonia, OR
The average last spring frost in Vernonia is around May 9 and the first fall frost is around October 2. That gives Vernonia an average growing season of about 146 days.
Last spring frost
| Early (10% chance after) | April 19 |
|---|---|
| Average (50%) | May 9 |
| Late (90%) | May 28 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | October 2 |
| Late (90% chance before) | October 23 |