Question 1

When should I plant lettuce in ZIP 96813?

Accepted Answer

In ZIP 96813, the main lettuce target is around Dec 18, based on the representative Honolulu frost station and USDA zone 12b.

Question 2

When should I start lettuce seeds indoors in 96813?

Accepted Answer

Start lettuce seeds indoors in ZIP 96813 around Dec 4, about 28 days before the Jan 1 last-frost estimate.

Question 3

When is the last frost in Honolulu?

Accepted Answer

Honolulu (ZIP 96813) has an average last spring frost around Jan 1, based on the representative Honolulu frost station.

Question 4

When is the first frost in Honolulu?

Accepted Answer

Honolulu (ZIP 96813) has an average first fall frost around Dec 31, leaving about 364 frost-free days.

Question 5

Is this a guaranteed planting date?

Accepted Answer

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

Step	Date	How to use it
Start Indoors	December 4, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	December 18, 2025	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	December 18, 2025	Sow seed outside when the crop and soil can handle the window.

Start lettuce seeds indoors around Dec 4

Lettuce dates for Honolulu, HI