Deciding to go the NCAA route, Fox headed to Harvard in the fall of 2016 for his freshman year with head coach Ted Donato and the Crimson. Given he would be playing against skaters up to four or five years his senior as a true freshman, many expected there to be a bit of a learning curve for the 5-foot-11, 181-pound rearguard.
As it turned out, he fit right in.
Fox posted 40 points through 35 games and was a key cog on the Crimson's blueline all year. He helped lead Harvard to a Beanpot title, a ECAC Championship and into the Frozen Four, where they fell in the semi-finals.
His list of accomplishments as a freshman are as follows: Ivy-League Rookie of the Year, New England Best Defenceman, NCAA East First All-American Team selection, ECAC All-Rookie Team selection, ECAC All-Tourament Team selection, ECAC First All-Star Team selection, New England D1 All-Star selection, and Ivy-League First Team selection.
He also captured gold with the USA at the 2017 IIHF World Junior Championship, amassing four assists in seven games.