When to plant radish in Christchurch
Radish is cold-hardy, so every date keys off Christchurch's frost dates of Oct 16.
Step 1 · Sow
Direct sow outdoors
Sep 18 – Oct 9
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Oct 13 – Oct 18
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Mar 29 – Apr 12
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Apr 30 – May 5
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Christchurch's 211-day season leaves this much room.
Radish 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 radish outdoors in Christchurch?
Direct-sow around mid September (Sep 18–Oct 9) in Christchurch, based on its local frost dates. Confidence 45%.
When will radish be ready to harvest in Christchurch?
Expect to harvest from around mid October (Oct 13–Oct 18) in Christchurch, based on its local frost dates. Confidence 40%.
Can I plant radish in autumn in Christchurch?
Yes — Christchurch supports a second, autumn sowing of radish around late March (Mar 29–Apr 12), 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 radish to maturity outdoors.
The rule of thumb
Sow radish 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.