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
TripCaptain flags black ice, dense fog, heavy snow, high wind, heavy rain, and low visibility segment by segment between Toronto, ON and Montreal, QC, and gives the trip a clear Hazard Score™ — a 0-100 read where higher is safer.
- 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.
Pick the safest time to leave
Compare departure windows for Toronto to Montreal and choose the one with the lowest risk and the arrival time you want.
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.