When to plant in Fullerton, CA
USDA Zone 10bFullerton, 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 ~354-day season lets Fullerton gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Heads up: the nearest complete-normals station is about 26 km from Fullerton, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. In zone 10b, frost is a minor factor for Fullerton — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
TUSTIN IRVINE RCH · 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 Fullerton’s own odds, recorded at TUSTIN IRVINE RCH.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 5 | Feb 1 | Jan 3 | Nov 24 | Dec 13 | Jan 8 |
| 32°F | Feb 2 | Jan 5 | Dec 14 | Dec 3 | Dec 25 | Jan 20 |
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 Fullerton, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 27 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.
Fullerton planting FAQ
When is the last spring frost in Fullerton, CA?
On average, the last spring frost in Fullerton is around January 5 (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 Fullerton, CA?
In Fullerton, the first 32°F freeze of fall lands around December 25 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Fullerton in?
Fullerton is in USDA hardiness zone 10b. In zone 10b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Fullerton?
Fullerton has about 354 frost-free days — a long growing season — between the average last spring frost (January 5) and first fall frost (December 25).
When should I plant tomatoes in Fullerton?
For Fullerton, sow tomatoes indoors about November 10–November 24 and move the seedlings out around January 12, after the last spring frost.
Never miss a window in Fullerton
An email when it’s time to start seeds, transplant, and sow — timed to Fullerton’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- La Habra · 5 km
- Placentia · 7 km
- Brea · 7 km
- La Mirada · 8 km
- Buena Park · 8 km
- Rowland Heights · 10 km
- South Whittier · 11 km
- La Palma · 11 km
Frost dates recorded at TUSTIN IRVINE RCH, 26 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 Fullerton, CA — Frost Dates & Zone 10b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00049087. Retrieved from https://blissgarden.com/california/fullerton.