whendoes fall season begins and ends in Ontario Canada?

Question

question is comprehensive enough.

Answer 1

Fall begins on or about September 21 (autumnal equinox) and ends on or about December 21 (winter solstice). From a practical point of view, I think it begins when the threat of frost is imminent and ends when the lakes begin to freeze over for the winter.

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Answer 2

It begins when it gets cold. It ends when it gets colder.