When to plant eggplant in Osaka
Eggplant is frost-tender, so every date keys off Osaka's last spring frost of Mar 22.
Step 1 · Sow
Start seeds indoors
Jan 25 – Feb 15
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Apr 5 – Apr 26
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jun 14 – Jun 29
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 85 d
Osaka's 258-day season leaves this much room.
Eggplant 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 will eggplant be ready to harvest in Osaka?
Expect to harvest from around mid June (Jun 14–Jun 29) in Osaka, based on its local frost dates. Confidence 77%.
When should I start eggplant seeds indoors in Osaka?
Start seeds indoors around late January (Jan 25–Feb 15) in Osaka, based on its local frost dates. Confidence 82%.
When can I transplant eggplant outdoors in Osaka?
Transplant outdoors around early April (Apr 5–Apr 26) 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 eggplant to maturity outdoors.
The rule of thumb
Sow eggplant 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.