When to plant sweet potato in Christchurch
Sweet potato is frost-tender, so every date keys off Christchurch's last spring frost of Oct 16.
Step 1 · Plant
Transplant outdoors
Feb 1 – Feb 22
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
May 2 – Jun 1
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Christchurch's 211-day season leaves this much room.
Sweet potato on Christchurch'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
OCT 16
MAY 19
Common questions
When will sweet potato be ready to harvest in Christchurch?
Expect to harvest from around early May (May 2–Jun 1) in Christchurch, based on its local frost dates. Confidence 40%.
When can I transplant sweet potato outdoors in Christchurch?
Transplant outdoors around early February (Feb 1–Feb 22) in Christchurch, based on its local frost dates. Confidence 44%.
How long is the growing season in Christchurch?
Christchurch has roughly 211 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 Christchurch's frost dates.
Confidence 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.