Frost dates in Union City, CA

The average last spring frost in Union City is around January 30 and the first fall frost is around December 18. That gives Union City an average growing season of about 323 days.

Last spring frost

Early (10% chance after)January 8
Average (50%)January 30
Late (90%)February 26

First fall frost

Early (10%)December 2
Average (50%)December 18
Late (90% chance before)December 27

See the Union City planting calendar →