Frost Dates for Barrie, Ontario, Canada

Coordinates: 44.383, -79.700

Growing Season

The last spring air frost in Barrie, Ontario, Canada typically occurs around May 12, and the first autumn air frost around Sep 21. This gives a frost-free growing season of approximately 132 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 -10°C (14°F). The warmest month is July, with an average high of 25°C (77°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 12 (last spring) to Sep 21 (first autumn). Light ground frost (-1°C / 30°F): May 2 (last spring) to Oct 1 (first autumn). Hard ground frost (-2°C / 28°F): Apr 16 (last spring) to Oct 16 (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 12 to Sep 21, which provides approximately 131 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 2 to Oct 1, which provides a total of 152 days for growing.

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