When to plant sweet potato in Montreal
Sweet potato is frost-tender, so every date keys off Montreal's last spring frost of May 11.
Step 1 · Plant
Transplant outdoors
Jun 1 – Jun 22
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 30 – Sep 29
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Montreal's 142-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
MAY 11
SEP 30
Common questions
When will sweet potato be ready to harvest in Montreal?
Expect to harvest from around late August (Aug 30–Sep 29) in Montreal, based on its local frost dates. Confidence 77%.
When can I transplant sweet potato outdoors in Montreal?
Transplant outdoors around early June (Jun 1–Jun 22) 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 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 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.