When to plant radish in Osaka
Radish is cold-hardy, so every date keys off Osaka's frost dates of Apr 10.
Step 1 · Sow
Direct sow outdoors
Mar 13 – Apr 3
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
Apr 7 – Apr 12
Picking runs until conditions turn against the crop.
Step 3 · Second sowing
Autumn / second sowing
Oct 2 – Oct 16
A second window for a fall crop, timed to mature before the first frost.
Step 4 · Second harvest
Autumn crop harvest
Nov 3 – Nov 8
Maturity window for the second sowing.
Window
Days to maturity
25 – 30 d
Osaka's 228-day season leaves this much room.
Radish 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
FROST
APR 10
NOV 22
Common questions
When can I sow radish outdoors in Osaka?
Direct-sow around mid March (Mar 13–Apr 3) in Osaka, based on its local frost dates. Confidence 45%.
When will radish be ready to harvest in Osaka?
Expect to harvest from around early April (Apr 7–Apr 12) in Osaka, based on its local frost dates. Confidence 40%.
Can I plant radish in autumn in Osaka?
Yes — Osaka supports a second, autumn sowing of radish around early October (Oct 2–Oct 16), timed to mature before the first fall frost.
How long is the growing season in Osaka?
Osaka has roughly 228 frost-free days, which is enough time to grow radish to maturity outdoors.
The rule of thumb
Sow radish 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 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.