When to Plant Sweet Potatoes in Zone 4
In USDA zone 4a, plant outdoors June 12 to September 20, and expect your first harvest around September 20. (4a shown here — see 4a and 4b dates separately below.)
Sweet Potatoes planting calendar for USDA Zone 4a
Average last spring frost
May 15
Average first fall frost
September 20
Direct sow
Jun 12
Projected first harvest
Sep 20
Most sweet potatoes mature in about 100 days, needing roughly 128 frost-free days in zone 4a.
Sweet Potatoes planting calendar for USDA Zone 4b
Average last spring frost
May 10
Average first fall frost
September 25
Direct sow
Jun 7
Projected first harvest
Sep 15
Most sweet potatoes mature in about 100 days, needing roughly 138 frost-free days in zone 4b.
Not sure whether you're in 4a or 4b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
2 varieties of sweet potatoes in the HomeSown library. Tap any for its full grow guide.
Common problems with sweet potatoes
What to watch for, with identification and treatment for each
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