When to plant in Vallejo, CA
USDA Zone 9bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Vallejo, California — all computed from Vallejo's nearest NOAA weather station.
Vallejo enjoys a long ~344-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. Zone 9b is warm enough that Vallejo can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
VALLEJO · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are Vallejo’s own odds, recorded at VALLEJO.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 8 | Mar 4 | Jan 19 | Nov 21 | Dec 7 | Jan 2 |
| 32°F | Mar 4 | Jan 17 | Dec 23 | Dec 4 | Dec 27 | Feb 4 |
| 28°F | Jan 19 | Jan 5 | Dec 19 | Dec 13 | Jan 2 | Jan 19 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Nothing new to sow or transplant outdoors in the next few weeks — a seasonal lull. Check the full-year calendar below for the next window.
Full-year planting calendar
Each bar is the exact window to take a planting action in Vallejo, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 17 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
Vallejo planting FAQ
When is the last spring frost in Vallejo, CA?
Plan for the last spring frost in Vallejo around January 17 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Vallejo, CA?
Expect Vallejo's first fall frost near December 27 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Vallejo in?
Vallejo is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Vallejo?
There are roughly 344 frost-free days in Vallejo (a long growing season), running from the average last frost around January 17 to the first fall frost near December 27.
When should I plant tomatoes in Vallejo?
In Vallejo, start tomato seeds indoors around November 22–December 6, then transplant seedlings outdoors around January 24 once the danger of frost has passed.
Never miss a window in Vallejo
An email when it’s time to start seeds, transplant, and sow — timed to Vallejo’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- American Canyon · 8 km
- Hercules · 10 km
- Benicia · 10 km
- Pinole · 13 km
- El Sobrante · 15 km
- San Pablo · 17 km
- Martinez · 18 km
- Richmond · 19 km
Frost dates recorded at VALLEJO, 7 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in Vallejo, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00049219. Retrieved from https://blissgarden.com/california/vallejo.