When to plant eggplant in Osaka
Eggplant is frost-tender, so every date keys off Osaka's last spring frost of Apr 10.
Step 1 · Sow
Start seeds indoors
Feb 25 – Mar 18
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
Jun 3 – Jun 24
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Aug 12 – Aug 27
Picking runs until conditions turn against the crop.
Window
Days to maturity
70 – 85 d
Osaka's 228-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
FROST
APR 10
NOV 22
Common questions
When will eggplant be ready to harvest in Osaka?
Expect to harvest from around mid August (Aug 12–Aug 27) in Osaka, based on its local frost dates. Confidence 40%.
When should I start eggplant seeds indoors in Osaka?
Start seeds indoors around late February (Feb 25–Mar 18) in Osaka, based on its local frost dates. Confidence 43%.
When can I transplant eggplant outdoors in Osaka?
Transplant outdoors around early June (Jun 3–Jun 24) in Osaka, based on its local frost dates. Confidence 44%.
How long is the growing season in Osaka?
Osaka has roughly 228 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 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.