I know that Florida and many of the provinces of Canada have reciprocity agreements where they have agreed to recognize each other's handicap parking permits as valid.
I don't know if Ontario has reciprocity and I was not able to come up with a combination of search words on google that would tell me. The easiest would probably be to call the agency that issued the permit to you and ask them. They should know that and be able to point you towards a resource so that you can check for yourself.