When to plant broccoli in Montreal
Broccoli is cold-hardy, so every date keys off Montreal's frost dates of Apr 19.
Step 1 · Sow
Start seeds indoors
Mar 8 – Mar 29
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 20 – May 11
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 19 – Jul 14
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jul 14 – Jul 28
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 19 – Oct 14
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
Montreal's 192-day season leaves this much room.
Broccoli 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 broccoli be ready to harvest in Montreal?
Expect to harvest from around mid June (Jun 19–Jul 14) in Montreal, based on its local frost dates. Confidence 76%.
When should I start broccoli seeds indoors in Montreal?
Start seeds indoors around early March (Mar 8–Mar 29) in Montreal, based on its local frost dates. Confidence 81%.
When can I transplant broccoli outdoors in Montreal?
Transplant outdoors around mid April (Apr 20–May 11) in Montreal, based on its local frost dates. Confidence 82%.
Can I plant broccoli in autumn in Montreal?
Yes — Montreal supports a second, autumn sowing of broccoli around mid July (Jul 14–Jul 28), timed to mature before the first fall frost.
How long is the growing season in Montreal?
Montreal has roughly 192 frost-free days, which is enough time to grow broccoli to maturity outdoors.
The rule of thumb
Sow broccoli 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.