Frost dates in Okanogan, WA
The average last spring frost in Okanogan is around May 9 and the first fall frost is around October 6. That gives Okanogan an average growing season of about 150 days.
Last spring frost
| Early (10% chance after) | April 20 |
|---|---|
| Average (50%) | May 9 |
| Late (90%) | May 21 |
First fall frost
| Early (10%) | September 23 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | October 18 |