Wyoming · zones 4a–5a
When to plant zucchini in Wyoming.
Sow between Jun 4 to Sep 17 in a typical year, keyed to Wyoming's median last frost around May 28. A second, fall sowing fits Jun 3 to Jun 22. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Zucchini dates for a typical Wyoming season.
Direct sow
Jun 4 to Sep 17
Keyed to the ~May 28 last frost. Sow 1" deep, 24" apart.
Fall round
Jun 3 to Jun 22
Counted back from the ~Sep 17 first frost.
Harvest
~50 days later
~8 lb per plant over ~5 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.