When to plant cauliflower in Montreal
Cauliflower is cold-hardy, so every date keys off Montreal's frost dates of May 11.
Step 1 · Sow
Start seeds indoors
Mar 30 – Apr 20
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 27 – May 18
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 26 – Jul 21
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Montreal's 142-day season leaves this much room.
Cauliflower 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
MAY 11
SEP 30
Common questions
When will cauliflower be ready to harvest in Montreal?
Expect to harvest from around late June (Jun 26–Jul 21) in Montreal, based on its local frost dates. Confidence 77%.
When should I start cauliflower seeds indoors in Montreal?
Start seeds indoors around late March (Mar 30–Apr 20) in Montreal, based on its local frost dates. Confidence 82%.
When can I transplant cauliflower outdoors in Montreal?
Transplant outdoors around late April (Apr 27–May 18) in Montreal, based on its local frost dates. Confidence 86%.
How long is the growing season in Montreal?
Montreal has roughly 142 frost-free days, which is enough time to grow cauliflower to maturity outdoors.
The rule of thumb
Sow cauliflower 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 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.