Question 1

When should I plant basil in ZIP 92101?

Accepted Answer

In ZIP 92101, the main basil target is around Feb 9, based on the representative San Diego frost station and USDA zone 10b.

Question 2

When should I start basil seeds indoors in 92101?

Accepted Answer

Start basil seeds indoors in ZIP 92101 around Dec 26, about 35 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	December 26, 2025	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	February 9, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	February 9, 2026	Sow seed outside when the crop and soil can handle the window.

Start basil seeds indoors around Dec 26

Basil dates for San Diego, CA