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Frost Dates for Modesto, California, United States of America

Coordinates: 37.639, -120.996

Growing Season

The last spring air frost in Modesto, California, United States of America typically occurs around Apr 27, and the first autumn air frost around Oct 14. This gives a frost-free growing season of approximately 170 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 8b, where the average annual extreme minimum temperature is -9.4 to -6.7°C (15 to 20°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 6°C (43°F). The warmest month is July, with an average high of 37°C (99°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 27 (last spring) to Oct 14 (first autumn). Light ground frost (-1°C / 30°F): Apr 4 (last spring) to Oct 29 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 8b

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

Current Risk Level: Light Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Apr 27 to Oct 14, which provides approximately 169 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 Apr 4 to Oct 29, which provides a total of 208 days for growing.

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