Frost dates in San Rafael, CA
The average last spring frost in San Rafael is around February 5 and the first fall frost is around December 13. That gives San Rafael an average growing season of about 312 days.
Last spring frost
| Early (10% chance after) | January 6 |
|---|---|
| Average (50%) | February 5 |
| Late (90%) | April 8 |
First fall frost
| Early (10%) | November 16 |
|---|---|
| Average (50%) | December 13 |
| Late (90% chance before) | December 27 |