When to plant sweet corn in Auckland
Sweet corn is frost-tender, so every date keys off Auckland's last spring frost of Aug 20.
Step 1 · Sow
Direct sow outdoors
Aug 27 – Sep 17
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Oct 26 – Dec 5
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Auckland's 294-day season leaves this much room.
Sweet corn 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
HARVEST
AUG 20
JUN 10
Common questions
When can I sow sweet corn outdoors in Auckland?
Direct-sow around late August (Aug 27–Sep 17) in Auckland, based on its local frost dates. Confidence 82%.
When will sweet corn be ready to harvest in Auckland?
Expect to harvest from around late October (Oct 26–Dec 5) in Auckland, based on its local frost dates. Confidence 74%.
How long is the growing season in Auckland?
Auckland has roughly 294 frost-free days, which is enough time to grow sweet corn to maturity outdoors.
The rule of thumb
Sow sweet corn 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.