Last frost date in Vacaville, CA
The average last frost in Vacaville is February 18. By March 25 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 28, which leaves 283 frost-free days. An early freeze before November 12 happens one year in ten.
- Safe after (10% risk)
- Mar 25
- Average first frost
- Nov 28
- Frost-free season
- 283 days
- Hard freeze (28°F) ends
- Jan 15
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2253°
- FriOct 2353°
- SatOct 2450°
- SunOct 2552°
- MonOct 2651°
- TueOct 2752°
Planting calendar for Vacaville
Windows count forward or back from the average frost dates above. Click a crop for dates across California.
TomatoesFeb 25–Mar 11
PumpkinsMar 4–Mar 18
SunflowersFeb 18–Mar 11
CucumbersMar 4–Mar 11
CornFeb 25–Mar 11
Sweet potatoesMar 11–Mar 25
WatermelonMar 4–Mar 18
Green beansFeb 25–Mar 18
ZucchiniFeb 25–Mar 11
OkraMar 11–Mar 25
PeppersMar 4–Mar 18
BasilFeb 25–Mar 11
Butternut squashFeb 25–Mar 11
CantaloupeMar 4–Mar 18
EggplantMar 4–Mar 18
PotatoesJan 21–Feb 4
OnionsJan 7–Jan 28
CarrotsJan 28–Mar 4
LettuceFeb 4–Feb 25
BroccoliJan 21–Feb 4
BeetsJan 21–Mar 4
PeasJan 7–Jan 21
CabbageJan 21–Feb 4
RadishesJan 14–Feb 25
Brussels sproutsFeb 4–Feb 18
SpinachJan 7–Jan 28
CilantroFeb 4–Feb 25
KaleJan 21–Feb 4
Collard greensJan 21–Feb 4
TurnipsJan 21–Feb 4
DillFeb 18–Mar 4
CeleryFeb 25–Mar 4
CauliflowerFeb 4–Feb 18
LeeksFeb 4–Feb 18
Swiss chardFeb 4–Mar 4
ParsleyFeb 4–Feb 25
Tulip bulbsNov 14–Dec 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesJan 21–Feb 4
AsparagusJan 21–Feb 4Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Jan 11 | Feb 18 | Mar 25 | Nov 12 | Nov 28 | Dec 18 |
| Hard freeze, 28°F | Dec 21 | Jan 15 | Feb 17 | Nov 24 | Dec 10 | Jan 11 |
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 Vacaville Nut Tree Airport (USW00093241) sits 1.4 miles from the center of Vacaville at 109 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 Vacaville, CA?
The average last frost date in Vacaville is February 18, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 25.
When is the first frost in Vacaville?
The first frost in fall usually comes around November 28. One year in ten it arrives before November 12.
How long is the growing season in Vacaville?
About 283 days between the average last and first frost.
When should I plant tomatoes in Vacaville?
Plant tomato seedlings outside from February 25 to March 11. Start seeds indoors six to eight weeks earlier.