When to plant basil in Christchurch
Basil is frost-tender, so every date keys off Christchurch's last spring frost of Oct 16.
Step 1 · Sow
Start seeds indoors
Oct 3 – Oct 24
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Dec 21 – Jan 11
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Feb 19 – Mar 21
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 90 d
Christchurch's 211-day season leaves this much room.
Basil 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 can I sow basil outdoors in Christchurch?
Direct-sow around late December (Dec 21–Jan 11) in Christchurch, based on its local frost dates. Confidence 44%.
When will basil be ready to harvest in Christchurch?
Expect to harvest from around mid February (Feb 19–Mar 21) in Christchurch, based on its local frost dates. Confidence 40%.
When should I start basil seeds indoors in Christchurch?
Start seeds indoors around early October (Oct 3–Oct 24) in Christchurch, based on its local frost dates. Confidence 43%.
When can I transplant basil outdoors in Christchurch?
Transplant outdoors around late December (Dec 21–Jan 11) 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 basil to maturity outdoors.
The rule of thumb
Sow basil 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.