Frost dates in Hamilton, WA

The average last spring frost in Hamilton is around April 14 and the first fall frost is around October 27. That gives Hamilton an average growing season of about 196 days.

Last spring frost

Early (10% chance after)March 17
Average (50%)April 14
Late (90%)May 10

First fall frost

Early (10%)October 2
Average (50%)October 27
Late (90% chance before)November 20

See the Hamilton planting calendar →