When to plant sweet corn in Montreal
Sweet corn is frost-tender, so every date keys off Montreal's last spring frost of May 11.
Step 1 · Sow
Direct sow outdoors
May 18 – Jun 8
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Jul 17 – Aug 26
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Montreal's 142-day season leaves this much room.
Sweet corn 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
HARVEST
MAY 11
SEP 30
Common questions
When can I sow sweet corn outdoors in Montreal?
Direct-sow around mid May (May 18–Jun 8) in Montreal, based on its local frost dates. Confidence 86%.
When will sweet corn be ready to harvest in Montreal?
Expect to harvest from around mid July (Jul 17–Aug 26) in Montreal, based on its local frost dates. Confidence 77%.
How long is the growing season in Montreal?
Montreal has roughly 142 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 Montreal's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.