Frost dates in San Marino, CA
The average last spring frost in San Marino is around February 4 and the first fall frost is around December 12. That gives San Marino an average growing season of about 312 days.
Last spring frost
| Early (10% chance after) | January 9 |
|---|---|
| Average (50%) | February 4 |
| Late (90%) | March 13 |
First fall frost
| Early (10%) | November 22 |
|---|---|
| Average (50%) | December 12 |
| Late (90% chance before) | December 25 |