Gaudreau played the 2010–11 season with the Dubuque Fighting Saints in the United States Hockey League (USHL),Former Gloucester Catholic ice hockey star John Gaudreau tearing up USHL. Articles.philly.com (April 3, 2011). Accessed 2013-01-04. where he played in the 2011 USHL All-Star Game and helped his team win the Clark Cup as the USHL champions. Gaudreau's outstanding play during the season was rewarded with him being selected to the USHL All-Rookie Team and to the All-USHL Second Team. He was also recognized as the USHL Rookie of the Year.
