How much winter range do EVs lose in Ontario?

Typically 20–35% in the coldest weeks, depending on the vehicle, cabin heat, and preconditioning.

🇨🇦 Canada

EVs in Ontario Winter

Humid continental cold with lake-effect snow near the Great Lakes and long freezing spells. Road salt is heavy.

Specification	Value	Source
Country	Canada	Public data
Winter temperature range	-5°C to -20°C (23°F to -4°F)	Climate normals
Climate profile	Humid continental cold with lake-effect snow near the Great Lakes and long freezing spells. Road salt is heavy.	Public data
Charging reality	Improving fast-charging network (Tesla, Flo, Petro-Canada, Ivy) along the 400-series highways and the Trans-Canada; northern Ontario is sparse.	Network coverage data

Winter tires are strongly advised and, in much of the province, effectively expected for insurance and safety.
Heavy road salt means you should keep the charge port and connectors clean and dry.
Preheat from the wall on cold mornings; Hydro One and municipal time-of-use rates make overnight charging cheap.

Yes on the main 400-series corridors; northern routes and lake-effect snow require planning and winter tires.