Before the NHL, he played for the Toronto Granites, a team that featured future Hockey Hall of Famer Hooley Smith. This team won the gold medal in the 1924 Winter Olympics. Team Captain Munro scored 18 goals in the Olympic tournament, which saw the Canadians outscore their combined opponents by a total of 110 to 3. As a result of the team's winning the gold medal, there was considerable interest to sign players from the team and Munro was quickly signed up by the newly formed Montreal Maroons.