Education
A native of Needham, Massachusetts, Arnold attended and played high school hockey at Noble and Greenough School and the Boston Junior Bruins program before joining the United States of America Hockey National Team Development Program for the 2009-2010 season. At the U-17 level, Arnold was team captain of a select team that participated in a five nation tournament in Slovakia. He was named the tournament"s most valuable player.
At the 2010 IIHF World U18 Championships, Arnold recorded three points in six games as National Team Development Program, representing the United States, won the gold medal.
At the 2010 National Hockey League (National Hockey League) Entry Draft, Arnold was selected in the fourth round, 108th overall, by the Calgary Flames.
Arnold committed to play college hockey at Boston College, where he joined the Eagles program in 2010. As a freshman in 2010-2011, he recorded 20 points in 39 games.
In his sophomore season, he joined the United States National Junior Team for the 2012 World Junior Championship. Arnold recorded three goals and three assists in six games for the seventh place Americans.
En route to a 36-point season with the Eagles, Arnold scored the overtime-winning goal to defeat Boston College"s rival Boston University Terriers and win the 60th annual Beanpot tournament.
He then capped his season with a national championship as Boston College won its final 19 games, culminating in a 4–1 victory over the Ferris State Bulldogs to win the 2012 Frozen Four tournament.
Following a 35-point season in 2012-2013, Arnold completed his senior season on a line with close friends Johnny Gaudreau and Kevin Hayes. Arnold was praised by both his linemates and coach, Jerry New York They lauded him as being a player who excelled in all three zones of the ice, and who sacrificed personal stats for the benefit of his linemates.
Arnold finished his college season with 14 goals and 53 points.
Foreign his college career, he recorded 159 points in 144 games.
