When to plant sweet potato in Baltimore
Sweet potato is frost-tender, so every date keys off Baltimore's last spring frost of Mar 21.
Step 1 · Plant
Transplant outdoors
May 12 – Jun 2
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 10 – Sep 9
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Baltimore's 249-day season leaves this much room.
Sweet potato on Baltimore'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
MAR 21
NOV 27
Common questions
When will sweet potato be ready to harvest in Baltimore?
Expect to harvest from around early August (Aug 10–Sep 9) in Baltimore, based on its local frost dates. Confidence 76%.
When can I transplant sweet potato outdoors in Baltimore?
Transplant outdoors around mid May (May 12–Jun 2) in Baltimore, based on its local frost dates. Confidence 81%.
How long is the growing season in Baltimore?
Baltimore has roughly 249 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 Baltimore's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.