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Frost Dates for Knoxville, Tennessee, United States of America

Coordinates: 35.961, -83.921

Growing Season

The last spring air frost in Knoxville, Tennessee, United States of America typically occurs around Apr 12, and the first autumn air frost around Sep 30. This gives a frost-free growing season of approximately 171 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 -1°C (30°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): Apr 12 (last spring) to Sep 30 (first autumn). Light ground frost (-1°C / 30°F): Mar 31 (last spring) to Oct 9 (first autumn). Hard ground frost (-2°C / 28°F): Mar 5 (last spring) to Oct 26 (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: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Apr 12 to Sep 30, which provides approximately 170 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 31 to Oct 9, which provides a total of 192 days for growing.

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