When to plant sweet potato in Fukuoka
Sweet potato is frost-tender, so every date keys off Fukuoka's last spring frost of Apr 4.
Step 1 · Plant
Transplant outdoors
May 28 – Jun 18
Once frost risk has passed and nights stay mild.
Step 2 · Harvest
Harvest window
Aug 26 – Sep 25
Picking runs until conditions turn against the crop.
Window
Days to maturity
90 – 120 d
Fukuoka's 239-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
FROST
APR 4
NOV 30
Common questions
When will sweet potato be ready to harvest in Fukuoka?
Expect to harvest from around late August (Aug 26–Sep 25) in Fukuoka, based on its local frost dates. Confidence 40%.
When can I transplant sweet potato outdoors in Fukuoka?
Transplant outdoors around late May (May 28–Jun 18) in Fukuoka, based on its local frost dates. Confidence 44%.
How long is the growing season in Fukuoka?
Fukuoka has roughly 239 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 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.