Pennsylvania · zones 5b–7b
When to plant broccoli in Pennsylvania.
Sow or transplant between Mar 4 to Apr 1 in a typical year, keyed to Pennsylvania's median last frost around Apr 25. A second, fall sowing fits Jun 30 to Aug 9. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Pennsylvania season.
1 · Start indoors
Jan 21 to Feb 18
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 4 to Apr 1
Keyed to the ~Apr 25 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jun 30 to Aug 9
Counted back from the ~Oct 14 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Pennsylvania spans more than one climate: Zone 6 is the most common zone, but the state runs 5b 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.