Frost dates · USDA zone 9b
Frost dates for Vallejo, CA
Vallejo, CA sees its last 32 °F night of spring around March 5 and its first of fall around November 21 — a 256-day freeze-free season in a typical year.
Pick a sauce; the Plan Builder runs this station's dates and hands back the calendar, plant count and gear list.
Freeze odds, by date
| Odds | Last spring freeze after | First fall freeze before |
|---|---|---|
| 9 years in 10 | Jan 26 | Dec 13 |
| Median — 1 year in 2 | Mar 5 | Nov 21 |
| 1 year in 10 | Apr 16 | Nov 3 |
The top row is the risky edge: in 9 years of 10 a spring freeze still comes after it, so tender transplants set out then need cover. The bottom row is the cautious date — only 1 year in 10 freezes after it — and the one to plan uncovered tender transplants against. Freeze-free season: 256 days median, at least 212 in 9 years of 10, at least 305 days in 1 year of 10. NOAA ranks season length year by year, so it is not the gap between two rows above. A hard freeze (28 °F) has a median last date of Jan 23 and first of Dec 5.
Vallejo planting calendar, 2027
Every row runs from the median last frost (Mar 5) and median first frost (Nov 21) above, using each cultivar's days to maturity. Same engine as the Plan Builder.
| Crop | Start indoors | Transplant / plant | First harvest | Days |
|---|---|---|---|---|
| Hardneck GarlicSiberian (porcelain hardneck) | — | Oct 15prior fall | Jun 12 | 240 from sow |
| Spanish OnionYellow Sweet Spanish (long-day) | Dec 11 | Feb 5 | May 26 | 110 from transplant |
| Mustard greensGarnet Giant (Brassica juncea) | Direct sow | Mar 5 | Apr 4 | 30 from sow |
| CilantroSlow Bolt (Coriandrum sativum) | Feb 19 | Feb 19 | Apr 5 | 45 from sow |
| Genovese BasilGenovese | Feb 5 | Mar 19 | May 18 | 60 from transplant |
| CayenneLong Slim Cayenne (Capsicum annuum) | Jan 8 | Mar 12 | May 26 | 75 from transplant |
| HabaneroOrange Habanero (Capsicum chinense) | Dec 25 | Mar 19 | Jun 22 | 95 from transplant |
| JalapeñoEarly Jalapeño (Capsicum annuum) | Jan 8 | Mar 12 | May 26 | 75 from transplant |
| Marconi Red PepperMarconi Red (Capsicum annuum) | Jan 8 | Mar 12 | May 31 | 80 from transplant |
| SerranoSerrano Tampiqueño (Capsicum annuum) | Jan 8 | Mar 12 | May 31 | 80 from transplant |
| Nantes CarrotScarlet Nantes | Feb 19 | Feb 19 | Apr 30 | 70 from sow |
| TomatilloToma Verde | Jan 22 | Mar 12 | May 21 | 70 from transplant |
| Roma TomatoRoma VF (determinate paste) | Jan 22 | Mar 12 | May 26 | 75 from transplant |
| San Marzano TomatoSan Marzano (indeterminate paste) | Jan 22 | Mar 12 | May 31 | 80 from transplant |
Tight means first harvest lands within two weeks of the median first fall frost: start that crop indoors on time or cover it in fall.
What sauce can Vallejo grow?
Each sauce, scheduled for a Vallejo container garden: when the first seeds go in and when enough fruit has ripened for one batch.
Vallejo frost questions
When is the last frost in Vallejo, CA?
The median last 32 °F freeze at NAPA CO AP, CA is March 5: half of years see a later one. One year in ten, a freeze still comes after April 16; nine years in ten, it comes after January 26. Source: NOAA NCEI 1991–2020 U.S. Climate Normals.
When is the first frost in Vallejo, CA?
The median first 32 °F freeze of fall is November 21. One year in ten it arrives before November 3; nine years in ten, before December 13.
How long is the growing season in Vallejo, CA?
256 days between the last spring and first fall 32 °F freeze in a median year. Nine years in ten the season runs at least 212 days; one year in ten, at least 305 days.
What growing zone is Vallejo, CA?
USDA hardiness zone 9b, per the 2023 USDA Plant Hardiness Zone Map for ZIP 94590. A zone describes the coldest winter night, not when frost ends, so it is the wrong number for a planting calendar — the frost dates on this page are the right one.
When should I plant tomatoes in Vallejo, CA?
Start Roma VF (determinate paste) seeds indoors around Jan 22 and transplant around Mar 12, 1 week after the median last frost. To cut the freeze risk to one year in ten, wait for Apr 16. First ripe fruit lands around May 26.
When should I plant peppers in Vallejo, CA?
Sow jalapeño indoors on a heat mat around Jan 8; transplant no earlier than Mar 12, and wait past it until nights hold above 50 °F — that can run weeks later. First green pods around May 26.
Nearby in California
- Richmondlast frost Jan 4
- Napalast frost Feb 12
- Novatolast frost Jan 11
- San Rafaellast frost Jan 11
- Fairfieldlast frost Jan 15
- Berkeleylast frost Jan 3
All California frost dates → · How frost-date math drives a sowing calendar →