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Frost Dates for Anchorage, Alaska, United States of America

Coordinates: 61.218, -149.900

Growing Season

The last spring air frost in Anchorage, Alaska, United States of America typically occurs around May 22, and the first autumn air frost around Sep 3. This gives a frost-free growing season of approximately 104 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 5b, where the average annual extreme minimum temperature is -26.1 to -23.3°C (-15 to -10°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 -11°C (12°F). The warmest month is July, with an average high of 17°C (63°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 22 (last spring) to Sep 3 (first autumn). Light ground frost (-1°C / 30°F): May 10 (last spring) to Sep 15 (first autumn). Hard ground frost (-2°C / 28°F): Apr 23 (last spring) to Oct 1 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 5b

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

Current Risk Level: Hard Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from May 22 to Sep 3, which provides approximately 103 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 10 to Sep 15, which provides a total of 128 days for growing.

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