Frost dates in Kennewick, WA

The average last spring frost in Kennewick is around April 13 and the first fall frost is around October 19. That gives Kennewick an average growing season of about 189 days.

Last spring frost

Early (10% chance after)March 20
Average (50%)April 13
Late (90%)May 2

First fall frost

Early (10%)September 29
Average (50%)October 19
Late (90% chance before)November 8

See the Kennewick planting calendar →