When to plant lettuce in Denver
Common questions
When can I sow lettuce outdoors in Denver?
Direct-sow around early April (Apr 6–Apr 27) in Denver, based on its local frost dates. Confidence 85%.
When will lettuce be ready to harvest in Denver?
Expect to harvest from around late May (May 28–Jun 12) in Denver, based on its local frost dates. Confidence 76%.
When should I start lettuce seeds indoors in Denver?
Start seeds indoors around early April (Apr 6–Apr 27) in Denver, based on its local frost dates. Confidence 81%.
When can I transplant lettuce outdoors in Denver?
Transplant outdoors around mid April (Apr 13–May 4) in Denver, based on its local frost dates. Confidence 85%.
Can I plant lettuce in autumn in Denver?
Yes — Denver supports a second, autumn sowing of lettuce around early July (Jul 6–Jul 20), timed to mature before the first fall frost.
How long is the growing season in Denver?
Denver has roughly 157 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 Denver's frost dates.