When to plant sweet potato in Fukuoka
Sweet potato is frost-tender, so every date keys off Fukuoka's last spring frost of Mar 15.
Step 1 · Plant
Transplant outdoors
Apr 5 – Apr 26
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Jul 4 – Aug 3
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Fukuoka's 268-day season leaves this much room.
Sweet potato on Fukuoka'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 15
DEC 8
Common questions
When will sweet potato be ready to harvest in Fukuoka?
Expect to harvest from around early July (Jul 4–Aug 3) in Fukuoka, based on its local frost dates. Confidence 65%.
When can I transplant sweet potato outdoors in Fukuoka?
Transplant outdoors around early April (Apr 5–Apr 26) in Fukuoka, based on its local frost dates. Confidence 72%.
How long is the growing season in Fukuoka?
Fukuoka has roughly 268 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 Fukuoka's frost dates.
Confidence 72/100 · NASA POWER (modeled) · 1991–2020 · frost dates are probabilities, not guarantees.