Frost dates in San Bruno, CA
The average last spring frost in San Bruno is around February 6 and the first fall frost is around December 7. That gives San Bruno an average growing season of about 305 days.
Last spring frost
| Early (10% chance after) | January 4 |
|---|---|
| Average (50%) | February 6 |
| Late (90%) | June 9 |
First fall frost
| Early (10%) | September 26 |
|---|---|
| Average (50%) | December 7 |
| Late (90% chance before) | December 27 |