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Frost Dates for Bloomington, Illinois, United States of America

Coordinates: 40.484, -88.994

Growing Season

The last spring air frost in Bloomington, Illinois, United States of America typically occurs around Apr 17, and the first autumn air frost around Sep 26. This gives a frost-free growing season of approximately 162 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6a, where the average annual extreme minimum temperature is -23.3 to -20.6°C (-10 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 -7°C (19°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): Apr 17 (last spring) to Sep 26 (first autumn). Light ground frost (-1°C / 30°F): Apr 7 (last spring) to Oct 5 (first autumn). Hard ground frost (-2°C / 28°F): Mar 20 (last spring) to Oct 20 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6a

... 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 Apr 17 to Sep 26, which provides approximately 161 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 Apr 7 to Oct 5, which provides a total of 181 days for growing.

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