Maryland · zones 6b–7b
When to plant sweet potatoes in Maryland.
Sow or transplant between May 15 to Jun 29 in a typical year, keyed to Maryland's median last frost around Apr 8. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Sweet Potatoes dates for a typical Maryland season.
1 · Start indoors
Apr 3 to May 18
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 15 to Jun 29
Keyed to the ~Apr 8 last frost. Sow 3" deep, 14" apart.
Harvest
~110 days later
~2.5 lb per plant over ~1 weeks.
Maryland spans more than one climate: Zone 7 is the most common zone, but the state runs 6b 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.