Massachusetts · zones 5a–7a
When to plant potatoes in Massachusetts.
Sow between Mar 15 to Apr 17 in a typical year, keyed to Massachusetts's median last frost around Apr 22. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Massachusetts season.
Direct sow
Mar 15 to Apr 17
Keyed to the ~Apr 22 last frost. Sow 4" deep, 12" apart.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Massachusetts spans more than one climate: Zone 6 is the most common zone, but the state runs 5a to 7a. 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.