Canada is a federal state like the US, and it similarly delegates much of the power to regulate driving to the provinces.

The main highway going East-West (Trans-Canada 1) requires you to put on snow tires during the winter.

I think it might only be an Alberta, BC provincial thing though.

British Columbia mandates winter tires on highways going through the mountains, and chains for trucks. I wish other provinces would put in similar mandates, because it's a bit of a clown show on the roads right now in Saskatchewan.