When to plant in Peoria, AZ
USDA Zone 9bPeoria, Arizona frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
A generous ~309-day season lets Peoria gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Peoria's nearest full-normals station sits about 20 km out, so treat these as a close estimate — local microclimate can nudge your first and last frost. In zone 9b, frost is a minor factor for Peoria — most perennials thrive, and annual vegetables can go out early and stay late.
Frost probability
WITTMANN 1SE · 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 Peoria’s own odds, recorded at WITTMANN 1SE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Mar 4 | Feb 6 | Nov 8 | Nov 26 | Dec 14 |
| 32°F | Mar 3 | Feb 5 | Jan 6 | Nov 20 | Dec 11 | Jan 2 |
| 28°F | Feb 12 | Jan 15 | Dec 14 | Dec 4 | Dec 27 | Jan 28 |
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 Peoria, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 22 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.
Peoria planting FAQ
When is the last spring frost in Peoria, AZ?
Peoria's average last spring frost falls near February 5 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Peoria, AZ?
The first fall frost in Peoria typically arrives around December 11 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Peoria in?
Peoria is in USDA hardiness zone 9b. In zone 9b, winters are mild — many tender perennials overwinter here.
How long is the growing season in Peoria?
Peoria has about 309 frost-free days — a long growing season — between the average last spring frost (February 5) and first fall frost (December 11).
When should I plant tomatoes in Peoria?
For Peoria, sow tomatoes indoors about December 11–December 25 and move the seedlings out around February 12, after the last spring frost.
Never miss a window in Peoria
An email when it’s time to start seeds, transplant, and sow — timed to Peoria’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reachFrost dates recorded at WITTMANN 1SE, 20 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 Peoria, AZ — Frost Dates & Zone 9b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00029464. Retrieved from https://blissgarden.com/arizona/peoria.