Frost Dates for Montreal, Quebec, Canada

Coordinates: 45.500, -73.583

Growing Season

The last spring air frost in Montreal, Quebec, Canada typically occurs around May 4, and the first autumn air frost around Sep 22. This gives a frost-free growing season of approximately 141 days.

USDA Hardiness Zone

This location falls in USDA Hardiness Zone 4b, where the average annual extreme minimum temperature is -31.7 to -28.9°C (-25 to -20°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 -13°C (9°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 22 (first autumn). Light ground frost (-1°C / 30°F): Apr 24 (last spring) to Oct 2 (first autumn). Hard ground frost (-2°C / 28°F): Apr 10 (last spring) to Oct 17 (first autumn).

We predict your growing zone to be approximately ...

USDA Growing Zone: USDA Growing Zone - 4b

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

Current Risk Level: Light Ground Frost possible

for today based on past data only.

We predict a frost free growing season at your location from May 4 to Sep 22, which provides approximately 140 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 24 to Oct 2, which provides a total of 161 days for growing.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec