When to plant leek in Montreal
Leek is cold-hardy, so every date keys off Montreal's frost dates of Apr 19.
Step 1 · Sow
Start seeds indoors
Feb 8 – Mar 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 26 – May 17
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Aug 4 – Aug 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
100 – 120 d
Montreal's 192-day season leaves this much room.
Leek on Montreal'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
APR 19
OCT 28
Common questions
When will leek be ready to harvest in Montreal?
Expect to harvest from around early August (Aug 4–Aug 24) in Montreal, based on its local frost dates. Confidence 76%.
When should I start leek seeds indoors in Montreal?
Start seeds indoors around early February (Feb 8–Mar 1) in Montreal, based on its local frost dates. Confidence 81%.
When can I transplant leek outdoors in Montreal?
Transplant outdoors around late April (Apr 26–May 17) in Montreal, based on its local frost dates. Confidence 82%.
How long is the growing season in Montreal?
Montreal has roughly 192 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 Montreal's frost dates.
Confidence 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.