When to plant in Azusa, CA
USDA Zone 10aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Azusa, California — all computed from Azusa's nearest NOAA weather station.
With about 354 frost-free days, Azusa supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. In zone 10a, frost is a minor factor for Azusa — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
POMONA/FAIRPLEX · 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 Azusa’s own odds, recorded at POMONA/FAIRPLEX.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Mar 9 | Feb 8 | Dec 29 | Nov 21 | Dec 10 | Dec 26 |
| 32°F | Feb 18 | Jan 8 | Dec 14 | Dec 5 | Dec 28 | Feb 2 |
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 Azusa, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 18 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.
Azusa planting FAQ
When is the last spring frost in Azusa, CA?
Plan for the last spring frost in Azusa around January 8 (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 Azusa, CA?
The first fall frost in Azusa typically arrives around December 28 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Azusa in?
Azusa is in USDA hardiness zone 10a. In zone 10a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Azusa?
Azusa has about 354 frost-free days — a long growing season — between the average last spring frost (January 8) and first fall frost (December 28).
When should I plant tomatoes in Azusa?
For Azusa, sow tomatoes indoors about November 13–November 27 and move the seedlings out around January 15, after the last spring frost.
Never miss a window in Azusa
An email when it’s time to start seeds, transplant, and sow — timed to Azusa’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Citrus · 3 km
- Duarte · 4 km
- Vincent · 5 km
- Glendora · 6 km
- Covina · 6 km
- Monrovia · 7 km
- Baldwin Park · 8 km
- West Covina · 9 km
Frost dates recorded at POMONA/FAIRPLEX, 15 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 Azusa, CA — Frost Dates & Zone 10a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00047050. Retrieved from https://blissgarden.com/california/azusa.