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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Canada Edition Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Freezing rain in Ontario most often occurs between November and April, when a layer of warm air aloft melts snow into rain that then freezes on contact with surfaces still below 0°C. The heaviest events typically hit the Ottawa Valley, the Lake Ontario shoreline, and the Highway 401 corridor from Windsor to Kingston.
What conditions lead to freezing rain in Ontario?
Freezing rain develops when a warm front pushes across the province, overrunning a shallow pool of Arctic air trapped near the ground. The result is supercooled liquid droplets that instantly freeze on roads, trees, power lines and walkways. Events can last a few hours or, in the case of major ice storms, several days.
How should you prepare for a freezing rain event?
Stay indoors if possible and avoid driving until roads have been treated. Keep a winter emergency kit in your car, including a flashlight, blanket and charger. If you must walk, choose gritted paths and watch for falling tree limbs. Municipalities often pre-salt highways, but side streets can remain dangerously slick.
Is freezing rain the same as sleet?
No. Sleet forms when snow partially melts and refreezes into ice pellets before reaching the ground. Freezing rain falls as liquid but freezes on contact, creating a smooth glaze of ice. Both can occur in the same storm, but freezing rain is more hazardous to roads and power lines.
How long does a freezing rain warning typically last?
Environment Canada issues a freezing rain warning when at least four hours of freezing rain is expected. The warning stays active until the precipitation changes to rain, snow or drizzle, or until surface temperatures rise above 0°C. Some warnings remain in place for 12 to 24 hours during multi-day storms.
Does freezing rain damage trees and wildlife?
Yes. A heavy coating of ice adds enormous weight to branches, causing widespread breakage. This can destroy habitat and food sources for birds and mammals. The resulting debris also poses a risk to people and property. Recovery in forests and urban parks may take several years after a severe storm.