When to plant summer squash / zucchini in Montreal
Summer squash / Zucchini is frost-tender, so every date keys off Montreal's last spring frost of Apr 19.
Step 1 · Sow
Start seeds indoors
Apr 16 – May 7
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 3 – Jun 24
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 18 – Aug 2
Picking runs until conditions turn against the crop.
Window
Days to maturity
45 – 60 d
Montreal's 192-day season leaves this much room.
Summer squash / Zucchini 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 can I sow summer squash / zucchini outdoors in Montreal?
Direct-sow around early June (Jun 3–Jun 24) in Montreal, based on its local frost dates. Confidence 82%.
When will summer squash / zucchini be ready to harvest in Montreal?
Expect to harvest from around mid July (Jul 18–Aug 2) in Montreal, based on its local frost dates. Confidence 76%.
When should I start summer squash / zucchini seeds indoors in Montreal?
Start seeds indoors around mid April (Apr 16–May 7) in Montreal, based on its local frost dates. Confidence 81%.
When can I transplant summer squash / zucchini outdoors in Montreal?
Transplant outdoors around early June (Jun 3–Jun 24) 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 summer squash / zucchini to maturity outdoors.
The rule of thumb
Sow summer squash / zucchini 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 85/100 · Curated · based on NOAA GHCN-Daily 1991–2020 normal · frost dates are probabilities, not guarantees.