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Frost Dates for Huntsville, Alabama, United States of America

Coordinates: 34.730, -86.586

Growing Season

The last spring air frost in Huntsville, Alabama, United States of America typically occurs around Mar 31, and the first autumn air frost around Oct 8. This gives a frost-free growing season of approximately 191 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 7b, where the average annual extreme minimum temperature is -15 to -12.2°C (5 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 0°C (32°F). The warmest month is July, with an average high of 31°C (88°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Mar 31 (last spring) to Oct 8 (first autumn). Light ground frost (-1°C / 30°F): Mar 16 (last spring) to Oct 17 (first autumn). Hard ground frost (-2°C / 28°F): Feb 17 (last spring) to Nov 14 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 7b

... 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 31 to Oct 8, which provides approximately 190 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 16 to Oct 17, which provides a total of 215 days for growing.

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