i've spotted a likely juvenile bald eagle at Leslie Spit 3 winters ago. it landed and, due to a long hike before that point, i didn't investigate.
but at least once a winter, i've spotted a bald eagle circling above the Toronto skies and it is usually near the Humber. I was at my friend's house in High Park a few years ago and saw once circling overhead. also saw one on a highway drive to Burlington.
but at this point, no bald eagles winter in Toronto.