Wyoming · zones 4a–5a
When to plant broccoli in Wyoming.
Sow or transplant between Apr 6 to May 4 in a typical year, keyed to Wyoming's median last frost around May 28. A second, fall sowing fits Jun 3 to Jul 13. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Wyoming season.
1 · Start indoors
Feb 23 to Mar 23
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Apr 6 to May 4
Keyed to the ~May 28 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jun 3 to Jul 13
Counted back from the ~Sep 17 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Wyoming spans more than one climate: Zone 5 is the most common zone, but the state runs 4a to 5a. 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.