When to plant sweet potato in Auckland
Sweet potato is frost-tender, so every date keys off Auckland's last spring frost of Aug 20.
Step 1 · Plant
Transplant outdoors
Sep 10 – Oct 1
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Dec 9 – Jan 8
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Auckland's 294-day season leaves this much room.
Sweet potato on Auckland'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
AUG 20
JUN 10
Common questions
When will sweet potato be ready to harvest in Auckland?
Expect to harvest from around early December (Dec 9–Jan 8) in Auckland, based on its local frost dates. Confidence 74%.
When can I transplant sweet potato outdoors in Auckland?
Transplant outdoors around early September (Sep 10–Oct 1) in Auckland, based on its local frost dates. Confidence 82%.
How long is the growing season in Auckland?
Auckland has roughly 294 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 Auckland's frost dates.
Confidence 82/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.