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 |