When to plant sweet potato in Wellington
Sweet potato is frost-tender, so every date keys off Wellington's last spring frost of Sep 1.
Step 1 · Plant
Transplant outdoors
Sep 22 – Oct 13
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Dec 21 – Jan 20
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Wellington's 273-day season leaves this much room.
Sweet potato on Wellington'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
SEP 1
JUN 1
Common questions
When will sweet potato be ready to harvest in Wellington?
Expect to harvest from around late December (Dec 21–Jan 20) in Wellington, based on its local frost dates. Confidence 72%.
When can I transplant sweet potato outdoors in Wellington?
Transplant outdoors around late September (Sep 22–Oct 13) in Wellington, based on its local frost dates. Confidence 80%.
How long is the growing season in Wellington?
Wellington has roughly 273 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 Wellington's frost dates.
Confidence 80/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.