Frost dates in Sonoma, CA

The average last spring frost in Sonoma is around March 14 and the first fall frost is around November 20. That gives Sonoma an average growing season of about 251 days.

Last spring frost

Early (10% chance after)February 5
Average (50%)March 14
Late (90%)April 26

First fall frost

Early (10%)October 23
Average (50%)November 20
Late (90% chance before)December 6

See the Sonoma planting calendar →