Frost dates in Oroville, WA
The average last spring frost in Oroville is around May 1 and the first fall frost is around October 5. That gives Oroville an average growing season of about 157 days.
Last spring frost
| Early (10% chance after) | April 18 |
|---|---|
| Average (50%) | May 1 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | September 23 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 11 |