When to plant sweet corn in Osaka
Sweet corn is frost-tender, so every date keys off Osaka's last spring frost of Mar 22.
Step 1 · Sow
Direct sow outdoors
Mar 29 – Apr 19
Sow straight into warm, workable soil.
Step 2 · Harvest
Harvest window
May 28 – Jul 7
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 100 d
Osaka's 258-day season leaves this much room.
Sweet corn 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
HARVEST
MAR 22
DEC 5
Common questions
When can I sow sweet corn outdoors in Osaka?
Direct-sow around late March (Mar 29–Apr 19) in Osaka, based on its local frost dates. Confidence 86%.
When will sweet corn be ready to harvest in Osaka?
Expect to harvest from around late May (May 28–Jul 7) in Osaka, based on its local frost dates. Confidence 77%.
How long is the growing season in Osaka?
Osaka has roughly 258 frost-free days, which is enough time to grow sweet corn to maturity outdoors.
The rule of thumb
Sow sweet corn 6–8 weeks before your last spring frost; plant out 2–3 weeks after it. 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.