When to plant sweet corn in Toronto
Sweet corn is frost-tender, so every date keys off Toronto's last spring frost of May 3.
Step 1 · Sow
Direct sow outdoors
Jun 5 – Jun 26
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Aug 4 – Sep 13
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Toronto's 160-day season leaves this much room.
Sweet corn 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
HARVEST
MAY 3
OCT 12
Common questions
When can I sow sweet corn outdoors in Toronto?
Direct-sow around early June (Jun 5–Jun 26) in Toronto, based on its local frost dates. Confidence 81%.
When will sweet corn be ready to harvest in Toronto?
Expect to harvest from around early August (Aug 4–Sep 13) in Toronto, based on its local frost dates. Confidence 75%.
How long is the growing season in Toronto?
Toronto has roughly 160 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 Toronto's frost dates.
Confidence 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.