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Frost Dates for San Jose, California, United States of America

Coordinates: 37.339, -121.894

Growing Season

The last spring air frost in San Jose, California, United States of America typically occurs around Apr 26, and the first autumn air frost around Nov 7. This gives a frost-free growing season of approximately 195 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 July, with an average high of 29°C (84°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 26 (last spring) to Nov 7 (first autumn). Light ground frost (-1°C / 30°F): Feb 16 (last spring) to Dec 14 (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 Apr 26 to Nov 7, which provides approximately 194 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 Feb 16 to Dec 14, which provides a total of 301 days for growing.

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