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 |