When to plant summer squash / zucchini in Perth
Summer squash / Zucchini is frost-tender, so every date keys off Perth's last spring frost of Aug 1.
Step 1 · Sow
Start seeds indoors
Jul 18 – Aug 8
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Aug 8 – Aug 29
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Sep 22 – Oct 7
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Perth's 343-day season leaves this much room.
Summer squash / Zucchini 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 can I sow summer squash / zucchini outdoors in Perth?
Direct-sow around early August (Aug 8–Aug 29) in Perth, based on its local frost dates. Confidence 80%.
When will summer squash / zucchini be ready to harvest in Perth?
Expect to harvest from around late September (Sep 22–Oct 7) in Perth, based on its local frost dates. Confidence 72%.
When should I start summer squash / zucchini seeds indoors in Perth?
Start seeds indoors around mid July (Jul 18–Aug 8) in Perth, based on its local frost dates. Confidence 76%.
When can I transplant summer squash / zucchini outdoors in Perth?
Transplant outdoors around early August (Aug 8–Aug 29) 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 summer squash / zucchini to maturity outdoors.
The rule of thumb
Sow summer squash / zucchini 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.