When to plant cauliflower in Sapporo
Cauliflower is cold-hardy, so every date keys off Sapporo's frost dates 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
Apr 21 – May 12
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 20 – Jul 15
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Sapporo's 173-day season leaves this much room.
Cauliflower 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 cauliflower be ready to harvest in Sapporo?
Expect to harvest from around mid June (Jun 20–Jul 15) in Sapporo, based on its local frost dates. Confidence 76%.
When should I start cauliflower 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 cauliflower outdoors in Sapporo?
Transplant outdoors around late April (Apr 21–May 12) 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 cauliflower to maturity outdoors.
The rule of thumb
Sow cauliflower 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 84/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.