Do you do anything with your balcony/garden when it's too cold outside for your summer plants?

I'm thinking of getting a small cold weather tree in a pot (balcony in Canada here!) and maybe some lights and things to make it look nice! But I don't know if even a tree could survive the Ottawa winter in a pot. Darnit.

So now I'm curious! What is the weather like for your fall/winter, and do you do anything in particular or just wait for things to thaw again?