When to plant leek in Toronto
Leek is cold-hardy, so every date keys off Toronto's frost dates of May 3.
Step 1 · Sow
Start seeds indoors
Feb 22 – Mar 15
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
Aug 3 – Aug 23
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Toronto's 160-day season leaves this much room.
Leek 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 3
OCT 12
Common questions
When will leek be ready to harvest in Toronto?
Expect to harvest from around early August (Aug 3–Aug 23) in Toronto, based on its local frost dates. Confidence 75%.
When should I start leek seeds indoors in Toronto?
Start seeds indoors around late February (Feb 22–Mar 15) in Toronto, based on its local frost dates. Confidence 79%.
When can I transplant leek outdoors in Toronto?
Transplant outdoors around late April (Apr 25–May 16) in Toronto, based on its local frost dates. Confidence 81%.
How long is the growing season in Toronto?
Toronto has roughly 160 frost-free days, which is enough time to grow leek to maturity outdoors.
The rule of thumb
Sow leek 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 83/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.