Maine · zones 3b–6a
When to plant broccoli in Maine.
Sow or transplant between Mar 17 to Apr 14 in a typical year, keyed to Maine's median last frost around May 8. A second, fall sowing fits Jun 23 to Aug 2. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Maine season.
1 · Start indoors
Feb 3 to Mar 3
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 17 to Apr 14
Keyed to the ~May 8 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jun 23 to Aug 2
Counted back from the ~Oct 7 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Maine spans more than one climate: Zone 5 is the most common zone, but the state runs 3b to 6a. 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.