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Frost Dates for San Antonio, Texas, United States of America

Coordinates: 29.424, -98.493

Growing Season

The last spring air frost in San Antonio, Texas, United States of America typically occurs around Feb 12, and the first autumn air frost around Nov 25. This gives a frost-free growing season of approximately 287 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 9a, where the average annual extreme minimum temperature is -6.7 to -3.9°C (20 to 25°F). This zone rating helps gardeners determine which perennial plants are likely to survive winter.

Temperature Overview

The coldest month is January, with an average low of 7°C (45°F). The warmest month is August, with an average high of 37°C (99°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Feb 12 (last spring) to Nov 25 (first autumn). Light ground frost (-1°C / 30°F): Jan 24 (last spring) to Dec 16 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 9a

... and the frost data for your area is ...

Current Risk Level: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Feb 12 to Nov 25, which provides approximately 285 frost free days.

For the less tender plants, or if you are planning to protect your plants with fleece etc, your growing season could stretch from Jan 24 to Dec 16, which provides a total of 326 days for growing.

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