Missouri · zones 5b–7a
When to plant broccoli in Missouri.
Sow or transplant between Feb 22 to Mar 22 in a typical year, keyed to Missouri's median last frost around Apr 15. A second, fall sowing fits Jul 6 to Aug 15. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Missouri season.
1 · Start indoors
Jan 11 to Feb 8
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Feb 22 to Mar 22
Keyed to the ~Apr 15 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jul 6 to Aug 15
Counted back from the ~Oct 20 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Missouri spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 7a. 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.