When to plant cauliflower in Tokyo
Cauliflower is cold-hardy, so every date keys off Tokyo's frost dates of Mar 28.
Step 1 · Sow
Start seeds indoors
Feb 14 – Mar 7
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 14 – Apr 4
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 13 – Jun 7
Picking runs until conditions turn against the crop.
Step 4 · Second sowing
Autumn / second sowing
Aug 19 – Sep 2
A second window for a fall crop, timed to mature before the first frost.
Step 5 · Second harvest
Autumn crop harvest
Oct 25 – Nov 19
Maturity window for the second sowing.
Window
Days to maturity
60 – 85 d
Tokyo's 258-day season leaves this much room.
Cauliflower on Tokyo'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
MAR 28
DEC 11
Common questions
When will cauliflower be ready to harvest in Tokyo?
Expect to harvest from around mid May (May 13–Jun 7) in Tokyo, based on its local frost dates. Confidence 40%.
When should I start cauliflower seeds indoors in Tokyo?
Start seeds indoors around mid February (Feb 14–Mar 7) in Tokyo, based on its local frost dates. Confidence 43%.
When can I transplant cauliflower outdoors in Tokyo?
Transplant outdoors around mid March (Mar 14–Apr 4) in Tokyo, based on its local frost dates. Confidence 45%.
Can I plant cauliflower in autumn in Tokyo?
Yes — Tokyo supports a second, autumn sowing of cauliflower around mid August (Aug 19–Sep 2), timed to mature before the first fall frost.
How long is the growing season in Tokyo?
Tokyo has roughly 258 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 Tokyo's frost dates.
Confidence 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.