When to plant lettuce in Osaka
Common questions
When can I sow lettuce outdoors in Osaka?
Direct-sow around mid March (Mar 13–Apr 3) in Osaka, based on its local frost dates. Confidence 45%.
When will lettuce be ready to harvest in Osaka?
Expect to harvest from around early May (May 4–May 19) in Osaka, based on its local frost dates. Confidence 40%.
When should I start lettuce seeds indoors in Osaka?
Start seeds indoors around mid March (Mar 13–Apr 3) in Osaka, based on its local frost dates. Confidence 43%.
When can I transplant lettuce outdoors in Osaka?
Transplant outdoors around mid March (Mar 20–Apr 10) in Osaka, based on its local frost dates. Confidence 45%.
Can I plant lettuce in autumn in Osaka?
Yes — Osaka supports a second, autumn sowing of lettuce around late August (Aug 26–Sep 9), timed to mature before the first fall frost.
How long is the growing season in Osaka?
Osaka has roughly 228 frost-free days, which is enough time to grow lettuce to maturity outdoors.
Sow lettuce as soon as the soil is workable — it tolerates cool weather and light frost. Every date on this page is derived from that rule and Osaka's frost dates.