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

See the Sammamish planting calendar →