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Frost Dates for Concord, California, United States of America

Coordinates: 37.978, -122.030

Growing Season

The last spring air frost in Concord, California, United States of America typically occurs around Apr 21, and the first autumn air frost around Oct 31. This gives a frost-free growing season of approximately 193 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 6°C (43°F). The warmest month is August, 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 21 (last spring) to Oct 31 (first autumn). Light ground frost (-1°C / 30°F): Mar 1 (last spring) to Nov 28 (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 21 to Oct 31, which provides approximately 192 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 Mar 1 to Nov 28, which provides a total of 272 days for growing.

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