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Frost Dates for Phoenix, Arizona, United States of America

Coordinates: 33.448, -112.073

Growing Season

The last spring air frost in Phoenix, Arizona, United States of America typically occurs around Mar 3, and the first autumn air frost around Nov 4. This gives a frost-free growing season of approximately 246 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 7°C (45°F). The warmest month is July, with an average high of 41°C (106°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Mar 3 (last spring) to Nov 4 (first autumn). Light ground frost (-1°C / 30°F): Feb 12 (last spring) to Nov 17 (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: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Mar 3 to Nov 4, which provides approximately 245 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 12 to Nov 17, which provides a total of 278 days for growing.

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