When to plant sweet potato in Montreal
Sweet potato is frost-tender, so every date keys off Montreal's last spring frost of Apr 19.
Step 1 · Plant
Transplant outdoors
Jun 18 – Jul 9
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Sep 16 – Oct 16
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Montreal's 192-day season leaves this much room.
Sweet potato 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 sweet potato be ready to harvest in Montreal?
Expect to harvest from around mid September (Sep 16–Oct 16) in Montreal, based on its local frost dates. Confidence 76%.
When can I transplant sweet potato outdoors in Montreal?
Transplant outdoors around mid June (Jun 18–Jul 9) 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 sweet potato to maturity outdoors.
The rule of thumb
Sow sweet potato 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.