When to plant cabbage in Sapporo
Cabbage is cold-hardy, so every date keys off Sapporo's frost dates of May 12.
Step 1 · Sow
Start seeds indoors
Mar 31 – Apr 21
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 1 – May 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 10 – Aug 9
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Jun 21 – Jul 5
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Sep 6 – Oct 6
Maturity window for the second sowing.
Window
Days to maturity
70 – 100 d
Sapporo's 166-day season leaves this much room.
Cabbage 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 cabbage be ready to harvest in Sapporo?
Expect to harvest from around early July (Jul 10–Aug 9) in Sapporo, based on its local frost dates. Confidence 40%.
When should I start cabbage seeds indoors in Sapporo?
Start seeds indoors around late March (Mar 31–Apr 21) in Sapporo, based on its local frost dates. Confidence 43%.
When can I transplant cabbage outdoors in Sapporo?
Transplant outdoors around early May (May 1–May 22) in Sapporo, based on its local frost dates. Confidence 44%.
Can I plant cabbage in autumn in Sapporo?
Yes — Sapporo supports a second, autumn sowing of cabbage around late June (Jun 21–Jul 5), timed to mature before the first fall frost.
How long is the growing season in Sapporo?
Sapporo has roughly 166 frost-free days, which is enough time to grow cabbage to maturity outdoors.
The rule of thumb
Sow cabbage as soon as the soil is workable — it tolerates cool weather and light frost. 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.