When to plant sweet potato in Charleston
Sweet potato is frost-tender, so every date keys off Charleston's last spring frost of Apr 16.
Step 1 · Plant
Transplant outdoors
May 25 – Jun 15
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 23 – Sep 22
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Charleston's 186-day season leaves this much room.
Sweet potato on Charleston's growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
APR 16
OCT 21
Common questions
When will sweet potato be ready to harvest in Charleston?
Expect to harvest from around late August (Aug 23–Sep 22) in Charleston, based on its local frost dates. Confidence 79%.
When can I transplant sweet potato outdoors in Charleston?
Transplant outdoors around late May (May 25–Jun 15) in Charleston, based on its local frost dates. Confidence 88%.
How long is the growing season in Charleston?
Charleston has roughly 186 frost-free days, which is enough time to grow sweet potato to maturity outdoors.
The rule of thumb
Sow sweet potato 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. Every date on this page is derived from that rule and Charleston's frost dates.
Confidence 88/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.