Idaho · zones 5b–7b
When to plant potatoes in Idaho.
Sow between Apr 3 to May 6 in a typical year, keyed to Idaho's median last frost around May 11. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Idaho season.
Direct sow
Apr 3 to May 6
Keyed to the ~May 11 last frost. Sow 4" deep, 12" apart.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Idaho spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 7b. 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.