When to plant swiss chard in Christchurch

Swiss chard is cold-hardy, so every date keys off Christchurch's frost dates of Oct 16.
Step 1 · Sow
Start seeds indoors
Sep 18 – Oct 9
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Oct 2 – Oct 23
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Nov 21 – Dec 1
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jan 31 – Feb 14
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Mar 29 – Apr 8
Maturity window for the second sowing.
Window
Days to maturity
50 – 60 d
Christchurch's 211-day season leaves this much room.
Swiss chard 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
OCT 16
MAY 19

Common questions

When can I sow swiss chard outdoors in Christchurch?

Direct-sow around early October (Oct 2–Oct 23) in Christchurch, based on its local frost dates. Confidence 45%.

When will swiss chard be ready to harvest in Christchurch?

Expect to harvest from around late November (Nov 21–Dec 1) in Christchurch, based on its local frost dates. Confidence 40%.

When should I start swiss chard seeds indoors in Christchurch?

Start seeds indoors around mid September (Sep 18–Oct 9) in Christchurch, based on its local frost dates. Confidence 43%.

When can I transplant swiss chard outdoors in Christchurch?

Transplant outdoors around early October (Oct 2–Oct 23) in Christchurch, based on its local frost dates. Confidence 45%.

Can I plant swiss chard in autumn in Christchurch?

Yes — Christchurch supports a second, autumn sowing of swiss chard around late January (Jan 31–Feb 14), timed to mature before the first fall frost.

How long is the growing season in Christchurch?

Christchurch has roughly 211 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 Christchurch's frost dates.

Confidence 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.