When to plant kale in Osaka
Kale is cold-hardy, so every date keys off Osaka's frost dates of Mar 22.
Step 1 · Sow
Start seeds indoors
Feb 8 – Mar 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Mar 1 – Mar 22
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Apr 25 – May 15
Picking runs until conditions turn against the crop.
Window
Days to maturity
55 – 75 d
Osaka's 258-day season leaves this much room.
Kale on Osaka'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 22
DEC 5
Common questions
When can I sow kale outdoors in Osaka?
Direct-sow around early March (Mar 1–Mar 22) in Osaka, based on its local frost dates. Confidence 86%.
When will kale be ready to harvest in Osaka?
Expect to harvest from around late April (Apr 25–May 15) in Osaka, based on its local frost dates. Confidence 77%.
When should I start kale seeds indoors in Osaka?
Start seeds indoors around early February (Feb 8–Mar 1) in Osaka, based on its local frost dates. Confidence 82%.
When can I transplant kale outdoors in Osaka?
Transplant outdoors around early March (Mar 1–Mar 22) in Osaka, based on its local frost dates. Confidence 86%.
How long is the growing season in Osaka?
Osaka has roughly 258 frost-free days, which is enough time to grow kale to maturity outdoors.
The rule of thumb
Sow kale 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 Osaka's frost dates.
Confidence 86/100 · NOAA GHCN-Daily · 1991–2020 normals · frost dates are probabilities, not guarantees.