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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
A Montreal ice storm brings freezing rain that coats streets, power lines and trees in heavy ice. These storms typically occur between December and March, with accumulations of 10–30 mm of ice causing widespread power outages and hazardous travel.
What happens during a Montreal ice storm?
Freezing rain falls when warm air aloft meets sub-zero air at the surface. Rain droplets freeze on contact, building layers of clear ice on every exposed surface. Ice accumulation of 15 mm or more begins snapping tree branches and power lines. Environment and Climate Change Canada issues weather warnings 12–24 hours before freezing rain starts, giving you time to prepare.
Montreal’s worst ice storm on record was January 1998, when 80–100 mm of ice fell over five days. Over 1.6 million Hydro-Québec customers lost power, some for up to three weeks. Modern infrastructure is better reinforced, but heavy freezing rain still causes major disruptions.
How to stay safe when freezing rain hits
Stay indoors during the storm. If you must drive, slow down and keep extra distance — ice builds faster on bridges and overpasses. Charge devices and have flashlights ready before power goes out. Never go near downed power lines; report them to Hydro-Québec at 1-800-790-2424. Check the weather 10‑day forecast before making travel plans.
How long do Montreal ice storms usually last?
Most freezing rain events last 4–12 hours as a warm front passes. Prolonged storms that stall over the St. Lawrence Valley can persist 24–48 hours, increasing ice load and damage risk.
Does Montreal get ice storms every year?
Montreal sees at least one significant freezing rain event each winter. Major ice storms with region-wide power outages occur roughly every 5–10 years. Check the storm forecast for Ontario and Quebec during winter months.
What should I keep in my car during ice storm season?
Keep an ice scraper, blanket, flashlight, booster cables, and a small bag of sand or cat litter for traction. Check the Ottawa ice storm page for similar winter driving advice.