Frost Dates for Toronto, Ontario, Canada

Coordinates: 43.667, -79.417

Growing Season

The last spring air frost in Toronto, Ontario, Canada typically occurs around May 1, and the first autumn air frost around Oct 4. This gives a frost-free growing season of approximately 156 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 6a, where the average annual extreme minimum temperature is -23.3 to -20.6°C (-10 to -5°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 -7°C (19°F). The warmest month is July, with an average high of 26°C (79°F).

Frost Risk Breakdown

Frost dates at three temperature thresholds: Air frost (0°C / 32°F): May 1 (last spring) to Oct 4 (first autumn). Light ground frost (-1°C / 30°F): Apr 22 (last spring) to Oct 13 (first autumn). Hard ground frost (-2°C / 28°F): Apr 7 (last spring) to Oct 28 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 6a

... 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 1 to Oct 4, which provides approximately 155 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 22 to Oct 13, which provides a total of 174 days for growing.

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