Frost dates for Phoenix, Arizona
In a typical year, Phoenix’s last spring frost lands around Jan 21 and the first fall frost around Dec 16, a growing season of about 329 days. These are odds drawn from 30-year NOAA climate normals, not a promise. USDA zone 10a.
Right now the growing season is open, with about 52 days until the typical first fall frost.
| Odds | Last spring frost | First fall frost |
|---|---|---|
| 10 percent | Dec 24 | Nov 29 |
| 50 percent | Jan 21 | Dec 16 |
| 90 percent | Feb 20 | Jan 9 |
A 10 percent year is an early year, a 90 percent year a late one. Frost-sensitive planting usually waits for the 90 percent side of the last-frost band.
Soil in Phoenix is typically around 70°F at 4 inches this time of year, estimated from the last two weeks of normal air temperatures.
Plantable now in Phoenix
- Dill (Bouquet)
- Cauliflower (Snow Crown)
- Arugula (Astro)
- Broccoli (Green Magic)
- Mustard greens (Red Giant)
- Cabbage (Red Acre)
- Cilantro (Santo)
- Sweet alyssum (Snow Crystals)
Timing comes from the same temperature engine the app uses, run against Phoenix’s normals for today.
Common questions
When is the last frost in Phoenix, Arizona?
Phoenix’s last spring frost falls around January 21 in a typical year. One year in ten it is done by December 24, and one year in ten frost holds on until February 20. Frost-sensitive planting usually waits for the late side of that band.
When is the first fall frost in Phoenix?
The first fall frost arrives around December 16 in a typical year, as early as November 29 in an early year and as late as January 9 in a late one.
How long is the growing season in Phoenix?
About 329 days, counted between the typical last spring frost and the typical first fall frost.
What USDA zone is Phoenix in?
Phoenix is in USDA hardiness zone 10a under the 2023 USDA Plant Hardiness Zone Map.
Dates come from 30-year NOAA climate normals for the nearest reporting station. They describe odds, not a forecast.
Nearby cities
- Tempe, AZ (around Feb 13 to Dec 5)
- Glendale, AZ (around Jan 20 to Dec 15)
- Scottsdale, AZ (around Feb 13 to Dec 5)
- Peoria, AZ (around Jan 20 to Dec 15)
- Chandler, AZ (around Feb 13 to Dec 5)
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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