Question 1

When should I plant lettuce in ZIP 92101?

Accepted Answer

In ZIP 92101, the main lettuce target is around Jan 16, based on the representative San Diego frost station and USDA zone 10b.

Question 2

When should I start lettuce seeds indoors in 92101?

Accepted Answer

Start lettuce seeds indoors in ZIP 92101 around Jan 2, about 28 days before the Jan 30 last-frost estimate.

Question 3

When is the last frost in San Diego?

Accepted Answer

San Diego (ZIP 92101) has an average last spring frost around Jan 30, based on the representative San Diego frost station.

Question 4

When is the first frost in San Diego?

Accepted Answer

San Diego (ZIP 92101) has an average first fall frost around Dec 15, leaving about 319 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	January 2, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	January 16, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	January 16, 2026	Sow seed outside when the crop and soil can handle the window.

Start lettuce seeds indoors around Jan 2

Lettuce dates for San Diego, CA