Frost dates in Hercules, CA

The average last spring frost in Hercules is around February 23 and the first fall frost is around December 6. That gives Hercules an average growing season of about 287 days.

Last spring frost

Early (10% chance after)January 3
Average (50%)February 23
Late (90%)April 3

First fall frost

Early (10%)November 19
Average (50%)December 6
Late (90% chance before)December 22

See the Hercules planting calendar →