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Frost Dates for Billings, Montana, United States of America

Coordinates: 45.783, -108.500

Growing Season

The last spring air frost in Billings, Montana, United States of America typically occurs around May 26, and the first autumn air frost around Aug 31. This gives a frost-free growing season of approximately 97 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 February, with an average low of -9°C (16°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): May 26 (last spring) to Aug 31 (first autumn). Light ground frost (-1°C / 30°F): May 13 (last spring) to Sep 9 (first autumn). Hard ground frost (-2°C / 28°F): Apr 25 (last spring) to Sep 21 (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 May 26 to Aug 31, which provides approximately 96 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 13 to Sep 9, which provides a total of 119 days for growing.

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