When to plant sweet potato in Calgary
Sweet potato is frost-tender, so every date keys off Calgary's last spring frost of May 23.
Step 1 · Plant
Transplant outdoors
Jun 13 – Jul 4
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Sep 11 – Oct 11
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Calgary's 115-day season leaves this much room.
Sweet potato on Calgary'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 23
SEP 15
Common questions
When will sweet potato be ready to harvest in Calgary?
Expect to harvest from around mid September (Sep 11–Oct 11) in Calgary, based on its local frost dates. Confidence 74%.
When can I transplant sweet potato outdoors in Calgary?
Transplant outdoors around mid June (Jun 13–Jul 4) in Calgary, based on its local frost dates. Confidence 82%.
How long is the growing season in Calgary?
Calgary has roughly 115 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 Calgary's frost dates.
Confidence 82/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.