Frost dates in Friday Harbor, WA
The average last spring frost in Friday Harbor is around April 8 and the first fall frost is around November 5. That gives Friday Harbor an average growing season of about 211 days.
Last spring frost
| Early (10% chance after) | March 6 |
|---|---|
| Average (50%) | April 8 |
| Late (90%) | May 11 |
First fall frost
| Early (10%) | October 14 |
|---|---|
| Average (50%) | November 5 |
| Late (90% chance before) | November 24 |