When to plant sweet corn in Perth
Sweet corn is frost-tender, so every date keys off Perth's last spring frost of Aug 1.
Step 1 · Sow
Direct sow outdoors
Aug 8 – Aug 29
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Oct 7 – Nov 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Perth's 343-day season leaves this much room.
Sweet corn 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
HARVEST
AUG 1
JUL 10
Common questions
When can I sow sweet corn outdoors in Perth?
Direct-sow around early August (Aug 8–Aug 29) in Perth, based on its local frost dates. Confidence 80%.
When will sweet corn be ready to harvest in Perth?
Expect to harvest from around early October (Oct 7–Nov 16) in Perth, based on its local frost dates. Confidence 72%.
How long is the growing season in Perth?
Perth has roughly 343 frost-free days, which is enough time to grow sweet corn to maturity outdoors.
The rule of thumb
Sow sweet corn 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 Perth's frost dates.
Confidence 80/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.