Frost Dates for Idaho Falls, Idaho, United States of America

Coordinates: 43.467, -112.033

Growing Season

The last spring air frost in Idaho Falls, Idaho, United States of America typically occurs around Jun 17, and the first autumn air frost around Aug 21. This gives a frost-free growing season of approximately 65 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 5b, where the average annual extreme minimum temperature is -26.1 to -23.3°C (-15 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 -10°C (14°F). The warmest month is July, with an average high of 32°C (90°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Jun 17 (last spring) to Aug 21 (first autumn). Light ground frost (-1°C / 30°F): Jun 1 (last spring) to Sep 4 (first autumn). Hard ground frost (-2°C / 28°F): May 4 (last spring) to Sep 21 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 5b

... 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 Jun 17 to Aug 21, which provides approximately 64 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 Jun 1 to Sep 4, which provides a total of 95 days for growing.

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