Phoenix Frost Dates
Phoenix, AZ · USDA Zone 9b
Phoenix Sky Harbor International Airport records a 32°F freeze in fewer than half of years (NOAA 1991-2020 US Climate Normals, station USW00023183).
Phoenix is in USDA Zone 9b. With virtually no frost, you can garden year-round.
Phoenix planting calendar
| Crop | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tomatoes | ● | ● | ||||||||||
| Peppers | ● | ● | ||||||||||
| Cucumbers | ● | ● | ||||||||||
| Lettuce | ● | ● | ||||||||||
| Zucchini | ● | ● | ||||||||||
| Carrots | ● | ● | ||||||||||
| Beans (bush) | ● | ● | ||||||||||
| Peas | ● | ● | ||||||||||
| Broccoli | ● | ● | ||||||||||
| Spinach | ● | ● | ||||||||||
| Kale | ● | ● | ||||||||||
| Onions | ● | ● | ||||||||||
| Garlic | ● | ● | ||||||||||
| Potatoes | ● | ● | ||||||||||
| Squash (winter) | ● | ● | ||||||||||
| Corn | ● | ● | ||||||||||
| Radishes | ● | ● | ||||||||||
| Beets | ● | ● | ||||||||||
| Eggplant | ● | ● | ||||||||||
| Basil | ● | ● | ||||||||||
| Cilantro | ● | ● | ||||||||||
| Parsley | ● | ● | ||||||||||
| Pumpkins | ● | ● | ||||||||||
| Sunflowers | ● | ● |
Fall planting in Phoenix
Phoenix does not really have a fall planting deadline. The limit here is summer heat, not frost, so the cool-season crops that fail in a Phoenix July are sown from about October onward.
Planning around Phoenix's frost dates
- What to plant in October by zone
The October sowing and planting list for Phoenix.
- What to plant in November by zone
What still goes in the ground in November in Phoenix.
- Winter sowing guide
Winter sowing dates for Phoenix.
- What changed in the 2023 USDA zone map
Whether the 2023 USDA map moved Phoenix, and what that changes.
- Companion planting chart
Which crops to plant together once you know your dates.
More frost dates
Other cities: New York, NY , Los Angeles, CA , Chicago, IL , Houston, TX , Philadelphia, PA , Atlanta, GA , Dallas, TX , Denver, CO , Seattle, WA , Minneapolis, MN , Miami, FL .
Frequently asked questions
When is the last frost in Phoenix?
Phoenix is effectively frost-free.
What planting zone is Phoenix, AZ?
Phoenix is in USDA hardiness Zone 9b.
When is the first frost in Phoenix?
Phoenix rarely records a freeze, so there is no meaningful first frost date.
What can I plant in the fall in Phoenix?
Fall is the easiest growing season in Phoenix. Cool-season crops that bolt in summer heat here are sown from about October onward.