It was first staged at Mosport Park in Bowmanville, Ontario, as a sports car event, before alternating between Mosport and Circuit Mont-Tremblant, Quebec, after Formula One took over the event. After 1971, safety concerns led to the Grand Prix moving permanently to Mosport. In 1978, after similar safety concerns with Mosport, the Canadian Grand Prix moved to its current home at Circuit Gilles Villeneuve on Notre Dame Island in Montreal.