Arizona · zones 5b–10a
When to plant kale in Arizona.
Sow or transplant between Jan 1 to Jan 26 in a typical year, keyed to Arizona's median last frost around Feb 5. A second, fall sowing fits Aug 15 to Sep 30. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Arizona season.
1 · Start indoors
Nov 20 to Dec 15
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Jan 1 to Jan 26
Keyed to the ~Feb 5 last frost. Sow 0.25" deep, 16" apart.
Fall round
Aug 15 to Sep 30
Counted back from the ~Nov 15 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Arizona spans more than one climate: Zone 9 is the most common zone, but the state runs 5b to 10a. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.