McCoshen got off to a strong start in his NCAA campaign at Boston College with a 13-point year as a top defensemen for the Eagles ice hockey team. He scored Boston College's first goal of the season and was on SportsCenter's Top-10 plays for his goal-saving effort in a game against the University of Minnesota. He also earned rookie of the week honors for his game-winning goal against the University of Massachusetts Lowell during the NCAA tournament. McCoshen played at the 2014 World Juniors for the United States.