Question 1

When should I plant tomatoes in ZIP 78205?

Accepted Answer

In ZIP 78205, the main tomatoes target is around Mar 8, based on the representative San Antonio frost station and USDA zone 9a.

Question 2

When should I start tomatoes seeds indoors in 78205?

Accepted Answer

Start tomatoes seeds indoors in ZIP 78205 around Jan 18, about 42 days before the Mar 1 last-frost estimate.

Question 3

When is the last frost in San Antonio?

Accepted Answer

San Antonio (ZIP 78205) has an average last spring frost around Mar 1, based on the representative San Antonio frost station.

Question 4

When is the first frost in San Antonio?

Accepted Answer

San Antonio (ZIP 78205) has an average first fall frost around Nov 20, leaving about 264 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 18, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	March 8, 2026	Move hardened-off seedlings outside after the frost-risk window.

Start tomatoes seeds indoors around Jan 18

Tomatoes dates for San Antonio, TX