When to plant sweet corn in Sapporo
Sweet corn is frost-tender, so every date keys off Sapporo's last spring frost of May 12.
Step 1 · Sow
Direct sow outdoors
Jul 2 – Jul 23
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Aug 31 – Oct 10
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Sapporo's 166-day season leaves this much room.
Sweet corn on Sapporo'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
HARVEST
MAY 12
OCT 20
Common questions
When can I sow sweet corn outdoors in Sapporo?
Direct-sow around early July (Jul 2–Jul 23) in Sapporo, based on its local frost dates. Confidence 44%.
When will sweet corn be ready to harvest in Sapporo?
Expect to harvest from around late August (Aug 31–Oct 10) in Sapporo, based on its local frost dates. Confidence 40%.
How long is the growing season in Sapporo?
Sapporo has roughly 166 frost-free days, which is enough time to grow sweet corn to maturity outdoors.
The rule of thumb
Sow sweet corn 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 Sapporo's frost dates.
Confidence 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.