Frost dates in Westminster, CO

The average last spring frost in Westminster is around May 6 and the first fall frost is around October 7. That gives Westminster an average growing season of about 154 days.

Last spring frost

Early (10% chance after)April 20
Average (50%)May 6
Late (90%)May 24

First fall frost

Early (10%)September 20
Average (50%)October 7
Late (90% chance before)October 28

See the Westminster planting calendar →