Indiana · zones 5b–6b
When to plant broccoli in Indiana.
Sow or transplant between Mar 1 to Mar 29 in a typical year, keyed to Indiana's median last frost around Apr 22. A second, fall sowing fits Jul 3 to Aug 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Indiana season.
1 · Start indoors
Jan 18 to Feb 15
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 1 to Mar 29
Keyed to the ~Apr 22 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jul 3 to Aug 12
Counted back from the ~Oct 17 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Indiana spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 6b. 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.