Toronto to Montreal — Weather & Driving Conditions

Driving from Toronto, ON to Montreal, QC? This 335-mile route follows ON-401, QC-20. TripCaptain checks the weather at every stop along the way — not just at each end — so you can see where conditions change before you pick a departure time.

What to watch for on this route

In the planner, TripCaptain highlights forecast weather risks between Toronto, ON and Montreal, QC and summarizes the analysis with a Hazard Score™ from 0 to 100. A higher score indicates lower forecast risk, without guaranteeing road conditions.

• Heavy Snow: Ontario-Quebec corridor averages 200+ cm of snow. Lake Ontario effect intensifies snow near Kingston.
• Black Ice: Highway 401 bridges and overpasses near the St. Lawrence River are prime black ice locations.
• Dense Fog: Lake Ontario and St. Lawrence River proximity creates persistent fog, especially Kingston to Cornwall.

When to go, season by season

• Spring (Mar–May): Snow possible through April. Freeze-thaw potholes common on 401. Improving by May.
• Summer (Jun–Aug): Excellent driving. Warm and clear. Construction zones frequent on 401.
• Fall (Sep–Nov): Beautiful fall colors along St. Lawrence. First snow by November. Fog returning.
• Winter (Dec–Feb): Serious winter driving. Snow tires required in Quebec (Dec 1). Black ice widespread. Temps to -30°C.

Compare departure times

Open Toronto to Montreal in the planner to check the forecast for your date and compare nearby hours within your plan's limits. Save the trip to follow changing conditions in Live Mode.

Fuel, EV range, and rest stops

See a weather-adjusted fuel or EV energy estimate for the drive, sensible break points across the 335 miles, and a packing list matched to the conditions ahead.

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