Frost dates in Washington, UT

The average last spring frost in Washington is around March 30 and the first fall frost is around November 4. That gives Washington an average growing season of about 219 days.

Last spring frost

Early (10% chance after)March 1
Average (50%)March 30
Late (90%)May 2

First fall frost

Early (10%)October 11
Average (50%)November 4
Late (90% chance before)November 23

See the Washington planting calendar →