Wyoming · zones 4a–5a
When to plant kale in Wyoming.
Sow or transplant between Apr 20 to May 18 in a typical year, keyed to Wyoming's median last frost around May 28. A second, fall sowing fits Jun 17 to Aug 2. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Wyoming season.
1 · Start indoors
Mar 9 to Apr 6
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Apr 20 to May 18
Keyed to the ~May 28 last frost. Sow 0.25" deep, 16" apart.
Fall round
Jun 17 to Aug 2
Counted back from the ~Sep 17 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 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.