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Frost Dates for Ames, Iowa, United States of America

Coordinates: 42.035, -93.620

Growing Season

The last spring air frost in Ames, Iowa, United States of America typically occurs around Apr 23, and the first autumn air frost around Sep 21. This gives a frost-free growing season of approximately 151 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 28°C (82°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): Apr 23 (last spring) to Sep 21 (first autumn). Light ground frost (-1°C / 30°F): Apr 14 (last spring) to Oct 1 (first autumn). Hard ground frost (-2°C / 28°F): Mar 28 (last spring) to Oct 16 (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: Air Frost possible

for today based on past data only.

We predict a frost free growing season at your location from Apr 23 to Sep 21, which provides approximately 150 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 14 to Oct 1, which provides a total of 170 days for growing.

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