Alaska · zones 3a–8a
When to plant watermelon in Alaska.
Sow between Jun 2 to Jul 19 in a typical year, keyed to Alaska's median last frost around May 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Watermelon dates for a typical Alaska season.
Direct sow
Jun 2 to Jul 19
Keyed to the ~May 12 last frost. Sow 1" deep, 36" apart.
Harvest
~85 days later
~20 lb per plant over ~3 weeks.
Alaska spans more than one climate: Zone 3 is the most common zone, but the state runs 3a to 8a. 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.