Oklahoma · zones 6b–7b
When to plant broccoli in Oklahoma.
Sow or transplant between Feb 6 to Mar 6 in a typical year, keyed to Oklahoma's median last frost around Mar 30. A second, fall sowing fits Jul 21 to Aug 30. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Oklahoma season.
1 · Start indoors
Dec 26 to Jan 23
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Feb 6 to Mar 6
Keyed to the ~Mar 30 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jul 21 to Aug 30
Counted back from the ~Nov 4 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 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.