I'm from Ontario. There is a message board that you can join which has a Canadian perspective. Most of the members are from Ontario, but not all. The message board is for the Association for Bright Children of Ontario.
Most Ontario Boards will recognize an evaluation done by a qualified psychologist, and can be pushed to provide some sort of differentiation, if there is no gifted program available. They tend to start in grade 4 or 5. Apparently, there is a shortage of school psychologists in Ontario, so the waiting lists are getting longer.
