Minnesota · zones 3b–5a
When to plant sweet corn in Minnesota.
Sow between May 12 to Aug 11 in a typical year, keyed to Minnesota's median last frost around May 5. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Corn dates for a typical Minnesota season.
Direct sow
May 12 to Aug 11
Keyed to the ~May 5 last frost. Sow 1.5" deep, 12" apart.
Harvest
~75 days later
~1 lb per plant over ~1 weeks.
Minnesota spans more than one climate: Zone 4 is the most common zone, but the state runs 3b 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.