Last frost date in San Bruno, California
January 11
Average last frost in spring. In an early year (1 in 10) it's over by December 23; in a late year (1 in 10) it comes after February 12.
January 10
Average first frost in fall. 1 year in 10 it comes by December 22.
A 32°F night happens here about 2 years in 10; in those years these are the usual dates.
Source: NOAA U.S. Climate Normals 1991–2020, station Pacifica 4 Sse (USC00046599), 3.2 miles from San Bruno, elevation 475 ft. NOAA National Centers for Environmental Information. These are long-term averages, not a forecast.
This station is also the nearest one for Pacifica, so its frost dates are the same as San Bruno's.
| Early year | Average | Late year | |
|---|---|---|---|
| Last frost in spring | Dec 23 | Jan 11 | Feb 12 |
| First frost in fall | Dec 22 | Jan 10 | Feb 5 |
Frost-free days in an average year: 365
| Chance in a year | Average last in spring | Average first in fall | |
|---|---|---|---|
| Light frost (36°F) | 7 years in 10 | Jan 25 | Jan 4 |
| Frost (32°F) | 2 years in 10 | Jan 11 | Jan 10 |
| Hard freeze (28°F) | Under 1 year in 20 | — | — |
Nights at 32°F or colder in an average year: 0.6
What to plant now in San Bruno
USDA's planting table covers places whose average last freeze is between January 30 and June 10, and whose first freeze is between August 30 and December 20. San Bruno's frost dates fall outside it, so we don't give planting dates for it.
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), “Suburban and Farm Vegetable Gardens,” tables 4 and 5. How we match the table.
Nearby in California
- San Mateo 8 mi · last frost Dec 29
- Half Moon Bay 11 mi · last frost Feb 6
- Redwood City 14 mi · last frost Jan 17
- Oakland 15 mi · last frost Jan 7
- Hayward 18 mi · last frost Jan 2
Updated