Frost dates in Coulee Dam, WA

The average last spring frost in Coulee Dam is around April 21 and the first fall frost is around October 21. That gives Coulee Dam an average growing season of about 183 days.

Last spring frost

Early (10% chance after)April 2
Average (50%)April 21
Late (90%)May 8

First fall frost

Early (10%)October 10
Average (50%)October 21
Late (90% chance before)November 5

See the Coulee Dam planting calendar →