Frost dates in Napa, CA

The average last spring frost in Napa is around March 7 and the first fall frost is around November 28. That gives Napa an average growing season of about 266 days.

Last spring frost

Early (10% chance after)January 20
Average (50%)March 7
Late (90%)April 21

First fall frost

Early (10%)November 4
Average (50%)November 28
Late (90% chance before)December 21

See the Napa planting calendar →