GrowZone

Crop by USDA zone

When to plant lettuce in zone 12b

In USDA zone 12b, plant lettuce around Dec 18, after the representative last frost near Jan 1. Start seeds indoors around Dec 4.

This page summarizes the supported ZIPs in zone 12b. Your exact city can move earlier or later, so use the ZIP lookup for the frost-station-specific answer.

Get exact lettuce dates by ZIP code.

Seed starting schedule

Lettuce dates for Honolulu, HI

StepDateHow to use it
Start IndoorsDecember 4, 2025Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsDecember 18, 2025Move hardened-off seedlings outside after the frost-risk window.
Direct SowDecember 18, 2025Sow seed outside when the crop and soil can handle the window.
Honolulu, HI · Zone 12b Lettuce Dec 18 Open ZIP-specific answer · last frost Jan 1