Frost dates in Sammamish, WA
The average last spring frost in Sammamish is around April 29 and the first fall frost is around October 19. That gives Sammamish an average growing season of about 173 days.
Last spring frost
| Early (10% chance after) | April 4 |
|---|---|
| Average (50%) | April 29 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | November 9 |