When to plant tomato in Sapporo
Tomato is frost-tender, so every date keys off Sapporo's last spring frost of May 5.
Step 1 · Sow
Start seeds indoors
Mar 24 – Apr 14
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 12 – Jun 2
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 11 – Aug 5
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Sapporo's 173-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 5
OCT 25
Common questions
When will tomato be ready to harvest in Sapporo?
Expect to harvest from around mid July (Jul 11–Aug 5) in Sapporo, based on its local frost dates. Confidence 76%.
When should I start tomato seeds indoors in Sapporo?
Start seeds indoors around late March (Mar 24–Apr 14) in Sapporo, based on its local frost dates. Confidence 80%.
When can I transplant tomato outdoors in Sapporo?
Transplant outdoors around mid May (May 12–Jun 2) in Sapporo, based on its local frost dates. Confidence 84%.
How long is the growing season in Sapporo?
Sapporo has roughly 173 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 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.