When to plant in Martinez, CA
USDA Zone 9bMartinez, California frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
A generous ~267-day season lets Martinez gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. In zone 9b, frost is a minor factor for Martinez — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
MARTINEZ WTP · 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 Martinez’s own odds, recorded at MARTINEZ WTP.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 3 | Apr 10 | Mar 15 | Oct 27 | Nov 7 | Nov 21 |
| 32°F | Apr 5 | Feb 28 | Jan 29 | Nov 7 | Nov 22 | Dec 10 |
| 28°F | Feb 25 | Jan 23 | Dec 25 | Nov 20 | Dec 9 | Jan 6 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in Martinez, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 5 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.
Martinez planting FAQ
When is the last spring frost in Martinez, CA?
On average, the last spring frost in Martinez is around February 28 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in Martinez, CA?
Expect Martinez's first fall frost near November 22 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Martinez in?
Martinez is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Martinez?
Martinez has about 267 frost-free days — a long growing season — between the average last spring frost (February 28) and first fall frost (November 22).
When should I plant tomatoes in Martinez?
For Martinez, sow tomatoes indoors about January 3–January 17 and move the seedlings out around March 7, after the last spring frost.
Never miss a window in Martinez
An email when it’s time to start seeds, transplant, and sow — timed to Martinez’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Pleasant Hill · 6 km
- Benicia · 9 km
- Concord · 10 km
- Lafayette · 12 km
- Walnut Creek · 12 km
- Orinda · 14 km
- Bay Point · 14 km
- Hercules · 16 km
Frost dates recorded at MARTINEZ WTP, 2 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 Martinez, CA — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00045378. Retrieved from https://blissgarden.com/california/martinez.