When to plant sweet potato in Milwaukee
Sweet potato is frost-tender, so every date keys off Milwaukee's last spring frost of Apr 23.
Step 1 · Plant
Transplant outdoors
Jun 19 – Jul 10
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Sep 17 – Oct 17
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Milwaukee's 182-day season leaves this much room.
Sweet potato on Milwaukee'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 23
OCT 23
Common questions
When will sweet potato be ready to harvest in Milwaukee?
Expect to harvest from around mid September (Sep 17–Oct 17) in Milwaukee, based on its local frost dates. Confidence 80%.
When can I transplant sweet potato outdoors in Milwaukee?
Transplant outdoors around mid June (Jun 19–Jul 10) in Milwaukee, based on its local frost dates. Confidence 86%.
How long is the growing season in Milwaukee?
Milwaukee has roughly 182 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 Milwaukee's frost dates.
Confidence 89/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.