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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.
An ice storm in Ottawa means freezing rain builds up on power lines, trees, and roads, often causing widespread outages and hazardous travel. These events typically occur in winter when warm air overrides a cold surface layer, creating a glaze of ice that can last for days.
What causes an ice storm in Ottawa?
Ice storms happen when rain falls through a layer of freezing air near the ground. The rain freezes on contact with surfaces below 0°C, coating everything in ice. Ottawa sits in a zone where warm systems from the south meet Arctic air, making freezing rain more common here than in many other Canadian cities.
How long do Ottawa ice storms last?
Most ice storms last 12 to 24 hours, but the aftermath can linger for days. Ice accumulation of 10 to 20 millimetres is enough to snap tree branches and bring down power lines. A major storm, like the 1998 ice storm, can paralyse the city for more than a week. For the latest timing, check the 10-day weather forecast for Ottawa.
Should I stay home during an Ottawa ice storm?
Yes, if possible. Driving on ice-covered roads is dangerous. Power outages can also strand you without heat or communication. Stay inside until Environment Canada lifts the freezing rain warning.
How do I prepare for an ice storm in Ottawa?
Keep a 72-hour emergency kit with water, food, flashlights, and batteries. Charge your devices before the storm. Park your car away from trees. For broader tips, see the weather warning guide.
Will Ottawa see another major ice storm like 1998?
It is possible but rare. Climate projections suggest the ottawa ice storm 2026 season could bring more freezing rain events, though not necessarily at 1998 levels. Monitor the ottawa weather 14 day and ottawa weather 30 days outlooks for early signs.