When to plant tomato in Osaka
Tomato is frost-tender, so every date keys off Osaka's last spring frost 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 29 – Apr 19
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
May 28 – Jun 22
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Osaka's 258-day season leaves this much room.
Tomato 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 tomato be ready to harvest in Osaka?
Expect to harvest from around late May (May 28–Jun 22) in Osaka, based on its local frost dates. Confidence 77%.
When should I start tomato 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 tomato outdoors in Osaka?
Transplant outdoors around late March (Mar 29–Apr 19) 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 tomato to maturity outdoors.
The rule of thumb
Sow tomato 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.