When to plant swiss chard in Perth
Swiss chard is cold-hardy, so every date keys off Perth's frost dates of Aug 1.
Step 1 · Sow
Start seeds indoors
Jul 4 – Jul 25
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 6 – Sep 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Perth's 343-day season leaves this much room.
Swiss chard 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 swiss chard outdoors in Perth?
Direct-sow around mid July (Jul 18–Aug 8) in Perth, based on its local frost dates. Confidence 80%.
When will swiss chard be ready to harvest in Perth?
Expect to harvest from around early September (Sep 6–Sep 16) in Perth, based on its local frost dates. Confidence 72%.
When should I start swiss chard seeds indoors in Perth?
Start seeds indoors around early July (Jul 4–Jul 25) in Perth, based on its local frost dates. Confidence 76%.
When can I transplant swiss chard 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 swiss chard to maturity outdoors.
The rule of thumb
Sow swiss chard 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.