When to plant swiss chard in Toronto
Swiss chard is cold-hardy, so every date keys off Toronto's frost dates of May 9.
Step 1 · Sow
Start seeds indoors
Apr 11 – May 2
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 25 – May 16
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 14 – Jun 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
50 – 60 d
Toronto's 150-day season leaves this much room.
Swiss chard on Toronto'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
FROST
FROST
MAY 9
OCT 6
Common questions
When can I sow swiss chard outdoors in Toronto?
Direct-sow around late April (Apr 25–May 16) in Toronto, based on its local frost dates. Confidence 88%.
When will swiss chard be ready to harvest in Toronto?
Expect to harvest from around mid June (Jun 14–Jun 24) in Toronto, based on its local frost dates. Confidence 79%.
When should I start swiss chard seeds indoors in Toronto?
Start seeds indoors around mid April (Apr 11–May 2) in Toronto, based on its local frost dates. Confidence 84%.
When can I transplant swiss chard outdoors in Toronto?
Transplant outdoors around late April (Apr 25–May 16) in Toronto, based on its local frost dates. Confidence 88%.
How long is the growing season in Toronto?
Toronto has roughly 150 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 Toronto's frost dates.
Confidence 88/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.