When to plant broccoli in Christchurch

Broccoli is cold-hardy, so every date keys off Christchurch's frost dates of Oct 16.
Step 1 · Sow
Start seeds indoors
Sep 4 – Sep 25
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
Dec 1 – Dec 26
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Feb 2 – Feb 16
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Apr 10 – May 5
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
Christchurch's 211-day season leaves this much room.
Broccoli 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 will broccoli be ready to harvest in Christchurch?

Expect to harvest from around early December (Dec 1–Dec 26) in Christchurch, based on its local frost dates. Confidence 40%.

When should I start broccoli seeds indoors in Christchurch?

Start seeds indoors around early September (Sep 4–Sep 25) in Christchurch, based on its local frost dates. Confidence 43%.

When can I transplant broccoli 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 broccoli in autumn in Christchurch?

Yes — Christchurch supports a second, autumn sowing of broccoli around early February (Feb 2–Feb 16), 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 broccoli to maturity outdoors.

The rule of thumb

Sow broccoli 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.