When to plant sweet potato in Ottawa
Sweet potato is frost-tender, so every date keys off Ottawa's last spring frost of May 6.
Step 1 · Plant
Transplant outdoors
May 27 – Jun 17
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 25 – Sep 24
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Ottawa's 149-day season leaves this much room.
Sweet potato on Ottawa'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 6
OCT 2
Common questions
When will sweet potato be ready to harvest in Ottawa?
Expect to harvest from around late August (Aug 25–Sep 24) in Ottawa, based on its local frost dates. Confidence 76%.
When can I transplant sweet potato outdoors in Ottawa?
Transplant outdoors around late May (May 27–Jun 17) in Ottawa, based on its local frost dates. Confidence 84%.
How long is the growing season in Ottawa?
Ottawa has roughly 149 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 Ottawa's frost dates.
Confidence 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.