Wyoming · zones 4a–5a
When to plant watermelon in Wyoming.
Sow between Jun 18 to Aug 4 in a typical year, keyed to Wyoming's median last frost around May 28. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Watermelon dates for a typical Wyoming season.
Direct sow
Jun 18 to Aug 4
Keyed to the ~May 28 last frost. Sow 1" deep, 36" apart.
Harvest
~85 days later
~20 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.