Last frost date in Martinez, CA
Expect the last frost in Martinez around February 28. Frost after April 5 happens in only one year out of ten. The first fall frost usually arrives about November 22, which leaves 266 frost-free days. An early freeze before November 7 happens one year in ten.
- Safe after (10% risk)
- Apr 5
- Average first frost
- Nov 22
- Frost-free season
- 266 days
- Hard freeze (28°F) ends
- Jan 23
No frost in the next 6 nights
National Weather Service forecast, updated Oct 22, 12:57 UTC
- ThuOct 2252°
- FriOct 2348°
- SatOct 2449°
- SunOct 2551°
- MonOct 2651°
- TueOct 2751°
Planting calendar for Martinez
Windows count forward or back from the average frost dates above. Click a crop for dates across California.
TomatoesMar 7–Mar 21
PumpkinsMar 14–Mar 28
SunflowersFeb 28–Mar 21
CucumbersMar 14–Mar 21
CornMar 7–Mar 21
Sweet potatoesMar 21–Apr 4
WatermelonMar 14–Mar 28
Green beansMar 7–Mar 28
ZucchiniMar 7–Mar 21
OkraMar 21–Apr 4
PeppersMar 14–Mar 28
BasilMar 7–Mar 21
Butternut squashMar 7–Mar 21
CantaloupeMar 14–Mar 28
EggplantMar 14–Mar 28
PotatoesJan 31–Feb 14
OnionsJan 17–Feb 7
CarrotsFeb 7–Mar 14
LettuceFeb 14–Mar 7
BroccoliJan 31–Feb 14
BeetsJan 31–Mar 14
PeasJan 17–Jan 31
CabbageJan 31–Feb 14
RadishesJan 24–Mar 7
Brussels sproutsFeb 14–Feb 28
SpinachJan 17–Feb 7
CilantroFeb 14–Mar 7
KaleJan 31–Feb 14
Collard greensJan 31–Feb 14
TurnipsJan 31–Feb 14
DillFeb 28–Mar 14
CeleryMar 7–Mar 14
CauliflowerFeb 14–Feb 28
LeeksFeb 14–Feb 28
Swiss chardFeb 14–Mar 14
ParsleyFeb 14–Mar 7
Tulip bulbsNov 8–Dec 13
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
StrawberriesJan 31–Feb 14
AsparagusJan 31–Feb 14Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Jan 29 | Feb 28 | Apr 5 | Nov 7 | Nov 22 | Dec 10 |
| Hard freeze, 28°F | Dec 25 | Jan 23 | Feb 25 | Nov 20 | Dec 9 | Jan 6 |
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 Martinez Water Plant (USC00045378) sits 1.0 miles from the center of Martinez at 40 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 Martinez, CA?
The average last frost date in Martinez is February 28, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 5.
When is the first frost in Martinez?
The first frost in fall usually comes around November 22. One year in ten it arrives before November 7.
How long is the growing season in Martinez?
About 266 days between the average last and first frost.
When should I plant tomatoes in Martinez?
Plant tomato seedlings outside from March 7 to March 21. Start seeds indoors six to eight weeks earlier.
Nearby in California
- Pleasant HillJan 7
- BeniciaJan 17
- ConcordJan 9
- LafayetteJan 7
- Walnut CreekJan 7
- Bay PointJan 9
- HerculesJan 17
- VallejoJan 17
- El CerritoJan 3
- PittsburgJan 12
- San PabloJan 4
- BerkeleyJan 3