When to plant swiss chard in Auckland
Swiss chard is cold-hardy, so every date keys off Auckland's frost dates of Aug 20.
Step 1 · Sow
Start seeds indoors
Jul 23 – Aug 13
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Aug 6 – Aug 27
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Sep 25 – Oct 5
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Auckland's 294-day season leaves this much room.
Swiss chard 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 can I sow swiss chard outdoors in Auckland?
Direct-sow around early August (Aug 6–Aug 27) in Auckland, based on its local frost dates. Confidence 82%.
When will swiss chard be ready to harvest in Auckland?
Expect to harvest from around late September (Sep 25–Oct 5) in Auckland, based on its local frost dates. Confidence 74%.
When should I start swiss chard seeds indoors in Auckland?
Start seeds indoors around late July (Jul 23–Aug 13) in Auckland, based on its local frost dates. Confidence 78%.
When can I transplant swiss chard outdoors in Auckland?
Transplant outdoors around early August (Aug 6–Aug 27) 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 swiss chard to maturity outdoors.
The rule of thumb
Sow swiss chard as soon as the soil is workable — it tolerates cool weather and light frost. 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.