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Frost Dates for Rochester, Minnesota, United States of America

Coordinates: 44.022, -92.470

Growing Season

The last spring air frost in Rochester, Minnesota, United States of America typically occurs around Apr 30, and the first autumn air frost around Sep 17. This gives a frost-free growing season of approximately 140 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 5a, where the average annual extreme minimum temperature is -28.9 to -26.1°C (-20 to -15°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 -13°C (9°F). The warmest month is July, with an average high of 26°C (79°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 30 (last spring) to Sep 17 (first autumn). Light ground frost (-1°C / 30°F): Apr 21 (last spring) to Sep 26 (first autumn). Hard ground frost (-2°C / 28°F): Apr 7 (last spring) to Oct 11 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 5a

... 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 30 to Sep 17, which provides approximately 139 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 21 to Sep 26, which provides a total of 158 days for growing.

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