When to plant tomato in Osaka
Tomato is frost-tender, so every date keys off Osaka's last spring frost of Apr 10.
Step 1 · Sow
Start seeds indoors
Mar 11 – Apr 1
Before your last frost, on a warm windowsill or heat mat.
Step 2 · Plant
Transplant outdoors
May 17 – Jun 7
Once frost risk has passed and nights stay mild.
Step 3 · Harvest
Harvest window
Jul 16 – Aug 10
Picking runs until conditions turn against the crop.
Window
Days to maturity
60 – 85 d
Osaka's 228-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
FROST
APR 10
NOV 22
Common questions
When will tomato be ready to harvest in Osaka?
Expect to harvest from around mid July (Jul 16–Aug 10) in Osaka, based on its local frost dates. Confidence 40%.
When should I start tomato seeds indoors in Osaka?
Start seeds indoors around mid March (Mar 11–Apr 1) in Osaka, based on its local frost dates. Confidence 43%.
When can I transplant tomato outdoors in Osaka?
Transplant outdoors around mid May (May 17–Jun 7) 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 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 45/100 · Curated · based on NASA POWER (modeled) 1991–2020 · frost dates are probabilities, not guarantees.