Vermont · zones 4a–5b
When to plant sweet potatoes in Vermont.
Sow or transplant between Jun 18 to Aug 2 in a typical year, keyed to Vermont's median last frost around May 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Potatoes dates for a typical Vermont season.
1 · Start indoors
May 7 to Jun 21
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Jun 18 to Aug 2
Keyed to the ~May 12 last frost. Sow 3" deep, 14" apart.
Harvest
~110 days later
~2.5 lb per plant over ~1 weeks.
Vermont spans more than one climate: Zone 5 is the most common zone, but the state runs 4a to 5b. 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.