Michigan · zones 4b–6b
When to plant potatoes in Michigan.
Sow between Mar 28 to Apr 30 in a typical year, keyed to Michigan's median last frost around May 5. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Michigan season.
Direct sow
Mar 28 to Apr 30
Keyed to the ~May 5 last frost. Sow 4" deep, 12" apart.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Michigan spans more than one climate: Zone 6 is the most common zone, but the state runs 4b 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.