Frost dates in San Marcos, CA

The average last spring frost in San Marcos is around January 30 and the first fall frost is around December 5. That gives San Marcos an average growing season of about 310 days.

Last spring frost

Early (10% chance after)January 4
Average (50%)January 30
Late (90%)February 15

First fall frost

Early (10%)November 2
Average (50%)December 5
Late (90% chance before)December 25

See the San Marcos planting calendar →