Wyoming · zones 4a–5a
When to plant spinach in Wyoming.
Sow between Apr 6 to May 18 in a typical year, keyed to Wyoming's median last frost around May 28. A second, fall sowing fits Jul 4 to Aug 22. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Spinach dates for a typical Wyoming season.
Direct sow
Apr 6 to May 18
Keyed to the ~May 28 last frost. Sow 0.5" deep, 3" apart.
Fall round
Jul 4 to Aug 22
Counted back from the ~Sep 17 first frost.
Harvest
~42 days later
~0.25 lb per plant over ~1 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.