Frost dates in South San Francisco, CA

The average last spring frost in South San Francisco is around January 20 and the first fall frost is around December 16. That gives South San Francisco an average growing season of about 331 days.

Last spring frost

Early (10% chance after)January 3
Average (50%)January 20
Late (90%)February 13

First fall frost

Early (10%)December 3
Average (50%)December 16
Late (90% chance before)December 25

See the South San Francisco planting calendar →