When to plant sweet potato in Perth
Sweet potato is frost-tender, so every date keys off Perth's last spring frost of Aug 1.
Step 1 · Plant
Transplant outdoors
Aug 22 – Sep 12
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Nov 20 – Dec 20
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Perth's 343-day season leaves this much room.
Sweet potato 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 sweet potato be ready to harvest in Perth?
Expect to harvest from around mid November (Nov 20–Dec 20) in Perth, based on its local frost dates. Confidence 72%.
When can I transplant sweet potato outdoors in Perth?
Transplant outdoors around late August (Aug 22–Sep 12) 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 sweet potato to maturity outdoors.
The rule of thumb
Sow sweet potato 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.