Frost Dates for Hamilton, Ontario, Canada

Coordinates: 43.250, -79.833

Growing Season

The last spring air frost in Hamilton, Ontario, Canada typically occurs around May 4, and the first autumn air frost around Sep 27. This gives a frost-free growing season of approximately 146 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 4 (last spring) to Sep 27 (first autumn). Light ground frost (-1°C / 30°F): Apr 25 (last spring) to Oct 5 (first autumn). Hard ground frost (-2°C / 28°F): Apr 12 (last spring) to Oct 20 (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: Air Frost possible

for today based on past data only.

We predict a frost free growing season at your location from May 4 to Sep 27, which provides approximately 145 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 25 to Oct 5, which provides a total of 163 days for growing.

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