Last frost date in San Bernardino, CA
In San Bernardino, the last spring frost comes around January 27 in an average year. Wait until February 28 if you want 90% odds of no more frost. The first fall frost usually arrives about December 19, which leaves 329 frost-free days. An early freeze before December 1 happens one year in ten.
- Safe after (10% risk)
- Feb 28
- Average first frost
- Dec 19
- Frost-free season
- 329 days
- Hard freeze (28°F) ends
- Jan 7
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2255°
- FriOct 2354°
- SatOct 2456°
- SunOct 2557°
- MonOct 2658°
- TueOct 2758°
Planting calendar for San Bernardino
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 17–Mar 3
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 17–Mar 3
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
PotatoesDec 30–Jan 13
OnionsDec 16–Jan 6
CarrotsJan 6–Feb 10
LettuceJan 13–Feb 3
BroccoliDec 30–Jan 13
BeetsDec 30–Feb 10
PeasDec 16–Dec 30
CabbageDec 30–Jan 13
RadishesDec 23–Feb 3
Brussels sproutsJan 13–Jan 27
SpinachDec 16–Jan 6
CilantroJan 13–Feb 3
KaleDec 30–Jan 13
Collard greensDec 30–Jan 13
TurnipsDec 30–Jan 13
DillJan 27–Feb 10
CeleryFeb 3–Feb 10
CauliflowerJan 13–Jan 27
LeeksJan 13–Jan 27
Swiss chardJan 13–Feb 10
ParsleyJan 13–Feb 3
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesDec 30–Jan 13
AsparagusDec 30–Jan 13Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Dec 21 | Jan 27 | Feb 28 | Dec 1 | Dec 19 | Jan 26 |
| Hard freeze, 28°F | Dec 17 | Jan 7 | Feb 15 | Dec 13 | Jan 1 | Feb 13 |
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 Redlands (USC00047306) sits 9.2 miles from the center of San Bernardino at 1,410 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 Bernardino, CA?
The average last frost date in San Bernardino is January 27, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 28.
When is the first frost in San Bernardino?
The first frost in fall usually comes around December 19. One year in ten it arrives before December 1.
How long is the growing season in San Bernardino?
About 329 days between the average last and first frost.
When should I plant tomatoes in San Bernardino?
Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.
Nearby in California
- RialtoJan 10
- ColtonJan 10
- Loma LindaJan 27
- HighlandJan 27
- BloomingtonJan 10
- RedlandsJan 27
- FontanaJan 4
- Jurupa ValleyJan 9
- RiversideJan 9
- Rancho CucamongaJan 4
- Moreno ValleyJan 27
- YucaipaJan 27