After commissioning and trials, "Montcalm" was assigned to the 4th Cruiser Division at Brest. Pre-war activities included being stationed in Saigon (now Ho Chi Minh City), French Indochina for two months from January 1938. Once back in France and part of the French Atlantic Fleet, her peacetime routine included a review for King George VI at Calais in July 1938 and she represented France at the New York World's Fair, in 1939.