When to plant tomato in Sapporo
Tomato is frost-tender, so every date keys off Sapporo's last spring frost of May 12.
Step 1 · Sow
Start seeds indoors
Apr 7 – Apr 28
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jul 2 – Jul 23
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Aug 31 – Sep 25
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Sapporo's 166-day season leaves this much room.
Tomato 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
MAY 12
OCT 20
Common questions
When will tomato be ready to harvest in Sapporo?
Expect to harvest from around late August (Aug 31–Sep 25) in Sapporo, based on its local frost dates. Confidence 40%.
When should I start tomato seeds indoors in Sapporo?
Start seeds indoors around early April (Apr 7–Apr 28) in Sapporo, based on its local frost dates. Confidence 43%.
When can I transplant tomato outdoors in Sapporo?
Transplant outdoors around early July (Jul 2–Jul 23) in Sapporo, based on its local frost dates. Confidence 44%.
How long is the growing season in Sapporo?
Sapporo has roughly 166 frost-free days, which is enough time to grow tomato to maturity outdoors.
The rule of thumb
Sow tomato 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.