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Frost Dates for Flagstaff, Arizona, United States of America

Coordinates: 35.198, -111.651

Growing Season

The last spring air frost in Flagstaff, Arizona, United States of America typically occurs around May 19, and the first autumn air frost around Sep 21. This gives a frost-free growing season of approximately 125 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 7a, where the average annual extreme minimum temperature is -17.8 to -15°C (0 to 5°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 -4°C (25°F). The warmest month is July, with an average high of 28°C (82°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 19 (last spring) to Sep 21 (first autumn). Light ground frost (-1°C / 30°F): May 8 (last spring) to Oct 1 (first autumn). Hard ground frost (-2°C / 28°F): Apr 15 (last spring) to Oct 19 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 7a

... 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 May 19 to Sep 21, which provides approximately 124 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 May 8 to Oct 1, which provides a total of 146 days for growing.

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