When to plant sweet potato in Osaka
Sweet potato is frost-tender, so every date keys off Osaka's last spring frost of Mar 22.
Step 1 · Plant
Transplant outdoors
Apr 12 – May 3
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Jul 11 – Aug 10
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Osaka's 258-day season leaves this much room.
Sweet potato on Osaka'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
MAR 22
DEC 5
Common questions
When will sweet potato be ready to harvest in Osaka?
Expect to harvest from around mid July (Jul 11–Aug 10) in Osaka, based on its local frost dates. Confidence 77%.
When can I transplant sweet potato outdoors in Osaka?
Transplant outdoors around mid April (Apr 12–May 3) in Osaka, based on its local frost dates. Confidence 86%.
How long is the growing season in Osaka?
Osaka has roughly 258 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 Osaka's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.