Maine · zones 3b–6a
When to plant potatoes in Maine.
Sow between Mar 31 to May 3 in a typical year, keyed to Maine's median last frost around May 8. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Maine season.
Direct sow
Mar 31 to May 3
Keyed to the ~May 8 last frost. Sow 4" deep, 12" apart.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Maine spans more than one climate: Zone 5 is the most common zone, but the state runs 3b to 6a. 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.