I have a balcony facing north in Toronto
I receive afternoon sun.
Any recommendations for trees that would endure our winters in a pot and what type of pot should I use?
Could I keep a tree like this indoors?
Balcony gardening is becoming more and more popular.
Below is a question similar to yours answered by a Toronto Master Gardeners which you may find helpful.
Here is another question answered by Toronto Master Gardeners which also deals with condo terrace pot planting.
Lastly, although this answer deals with cedars specifically, the considerations would apply to most potted trees which you might consider bringing inside.
We wish you every success with your potted tree on your balcony project.