Indiana · zones 5b–6b
When to plant watermelon in Indiana.
Sow between May 13 to Jun 29 in a typical year, keyed to Indiana's median last frost around Apr 22. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Watermelon dates for a typical Indiana season.
Direct sow
May 13 to Jun 29
Keyed to the ~Apr 22 last frost. Sow 1" deep, 36" apart.
Harvest
~85 days later
~20 lb per plant over ~3 weeks.
Indiana spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 6b. 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.