When to plant sweet potato in Saint Paul
Sweet potato is frost-tender, so every date keys off Saint Paul's last spring frost of Apr 22.
Step 1 · Plant
Transplant outdoors
Jun 7 – Jun 28
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Sep 5 – Oct 5
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Saint Paul's 174-day season leaves this much room.
Sweet potato on Saint Paul'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 22
OCT 12
Common questions
When will sweet potato be ready to harvest in Saint Paul?
Expect to harvest from around early September (Sep 5–Oct 5) in Saint Paul, based on its local frost dates. Confidence 76%.
When can I transplant sweet potato outdoors in Saint Paul?
Transplant outdoors around early June (Jun 7–Jun 28) in Saint Paul, based on its local frost dates. Confidence 81%.
How long is the growing season in Saint Paul?
Saint Paul has roughly 174 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 Saint Paul's frost dates.
Confidence 84/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.