Oklahoma · zones 6b–7b
When to plant kale in Oklahoma.
Sow or transplant between Feb 20 to Mar 20 in a typical year, keyed to Oklahoma's median last frost around Mar 30. A second, fall sowing fits Aug 4 to Sep 19. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Oklahoma season.
1 · Start indoors
Jan 9 to Feb 6
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Feb 20 to Mar 20
Keyed to the ~Mar 30 last frost. Sow 0.25" deep, 16" apart.
Fall round
Aug 4 to Sep 19
Counted back from the ~Nov 4 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Oklahoma spans more than one climate: Zone 7 is the most common zone, but the state runs 6b to 7b. 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.