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Frost Dates for Saint Peters, Missouri, United States of America

Coordinates: 38.800, -90.626

Growing Season

The last spring air frost in Saint Peters, Missouri, United States of America typically occurs around Apr 12, and the first autumn air frost around Oct 2. This gives a frost-free growing season of approximately 173 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6b, where the average annual extreme minimum temperature is -20.6 to -17.8°C (-5 to 0°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 -4°C (25°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): Apr 12 (last spring) to Oct 2 (first autumn). Light ground frost (-1°C / 30°F): Mar 31 (last spring) to Oct 11 (first autumn). Hard ground frost (-2°C / 28°F): Mar 7 (last spring) to Oct 27 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6b

... and the frost data for your area is ...

Current Risk Level: Unlikely (Safest)

for today based on past data only.

We predict a frost free growing season at your location from Apr 12 to Oct 2, which provides approximately 172 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 Mar 31 to Oct 11, which provides a total of 194 days for growing.

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