Yes, today is Thanksgiving Monday in Canada. It is a federal statutory holiday. Government offices, banks, and most businesses are closed for the day. That includes Toronto and Ottawa. Retailers are hit or miss today, so call ahead before you go out.
In the United States, today is Columbus Day, also a federal holiday. Some states observe it under a different name. U.S. stock markets and many banks are open today, but hours may be shorter than normal.