Ottawa school bus delays & cancellations

Ottawa Student Transportation Authority (OSTA) · Weather decisions announced by 6:15 AM

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How it is decided	All or nothing: when OSTA cancels for weather, transportation is cancelled to every school in the city at once — its four zones are used for other purposes, not weather splits.
When	Cancellations are posted by 6:15 AM.
Schools	Schools stay open when buses are cancelled unless your board (OCDSB or OCSB) announces a closure.