Last frost date in San Bruno, CA
In San Bruno, the last spring frost comes around January 11 in an average year. Wait until February 12 if you want 90% odds of no more frost. The first fall frost usually arrives about January 10, which leaves 365 frost-free days. An early freeze before December 22 happens one year in ten.
- Safe after (10% risk)
- Feb 12
- Average first frost
- Jan 10
- Frost-free season
- 365 days
- Hard freeze (28°F) ends
- rare
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2254°
- FriOct 2351°
- SatOct 2452°
- SunOct 2555°
- MonOct 2655°
- TueOct 2755°
Planting calendar for San Bruno
Windows count forward or back from the average frost dates above. Click a crop for dates across California.
TomatoesFeb 15–Mar 1
PumpkinsFeb 15–Mar 1
SunflowersFeb 15–Mar 8
CucumbersFeb 22–Mar 1
CornFeb 15–Mar 1
Sweet potatoesFeb 15–Mar 1
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 15–Mar 1
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
PotatoesDec 14–Dec 28
OnionsNov 30–Dec 21
CarrotsDec 21–Jan 25
LettuceDec 28–Jan 18
BroccoliDec 14–Dec 28
BeetsDec 14–Jan 25
PeasNov 30–Dec 14
CabbageDec 14–Dec 28
RadishesDec 7–Jan 18
Brussels sproutsDec 28–Jan 11
SpinachNov 30–Dec 21
CilantroDec 28–Jan 18
KaleDec 14–Dec 28
Collard greensDec 14–Dec 28
TurnipsDec 14–Dec 28
DillJan 11–Jan 25
CeleryJan 18–Jan 25
CauliflowerDec 28–Jan 11
LeeksDec 28–Jan 11
Swiss chardDec 28–Jan 25
ParsleyDec 28–Jan 18
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesDec 14–Dec 28
AsparagusDec 14–Dec 28Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Dec 23 | Jan 11 | Feb 12 | Dec 22 | Jan 10 | Feb 5 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Pacifica 4 SSE (USC00046599) sits 3.2 miles from the center of San Bruno at 475 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in San Bruno, CA?
The average last frost date in San Bruno is January 11, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 12.
When is the first frost in San Bruno?
The first frost in fall usually comes around January 10. One year in ten it arrives before December 22.
How long is the growing season in San Bruno?
About 365 days between the average last and first frost.
When should I plant tomatoes in San Bruno?
Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.
Nearby in California
- MillbraeDec 29
- PacificaJan 11
- South San FranciscoDec 29
- BurlingameDec 29
- Daly CityDec 30
- San MateoDec 29
- BelmontJan 17
- Foster CityJan 17
- AlamedaJan 7
- San CarlosJan 17
- Redwood CityJan 17
- Oaklandno frost