September 7 - Soldiers of the 70th Regiment subdue a fire, which consumes over eighty buildings, in Montreal.
September to October: The Great Miramichi Fire destroys at least 10 000 km ² to 20,000 km ² and killing at least 280 people.
October 26 - US finishes ambitious Erie Canal from Buffalo to Hudson River and New York City. It puts competitive pressure on Montreal and Toronto merchant elites to finish canals.