When to plant cauliflower in Perth
Cauliflower is cold-hardy, so every date keys off Perth's frost dates of Aug 1.
Step 1 · Sow
Start seeds indoors
Jun 20 – Jul 11
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jul 18 – Aug 8
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Sep 16 – Oct 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Perth's 343-day season leaves this much room.
Cauliflower on Perth'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
AUG 1
JUL 10
Common questions
When will cauliflower be ready to harvest in Perth?
Expect to harvest from around mid September (Sep 16–Oct 11) in Perth, based on its local frost dates. Confidence 72%.
When should I start cauliflower seeds indoors in Perth?
Start seeds indoors around mid June (Jun 20–Jul 11) in Perth, based on its local frost dates. Confidence 76%.
When can I transplant cauliflower outdoors in Perth?
Transplant outdoors around mid July (Jul 18–Aug 8) in Perth, based on its local frost dates. Confidence 80%.
How long is the growing season in Perth?
Perth has roughly 343 frost-free days, which is enough time to grow cauliflower to maturity outdoors.
The rule of thumb
Sow cauliflower 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 Perth's frost dates.
Confidence 80/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.