Frost dates in Issaquah, WA
The average last spring frost in Issaquah is around March 18 and the first fall frost is around November 11. That gives Issaquah an average growing season of about 238 days.
Last spring frost
| Early (10% chance after) | February 21 |
|---|---|
| Average (50%) | March 18 |
| Late (90%) | April 3 |
First fall frost
| Early (10%) | October 28 |
|---|---|
| Average (50%) | November 11 |
| Late (90% chance before) | December 5 |