 Folin scored 6 goals and 14 assists in 41 games during the 2013–14 season with the UMass Lowell River Hawks.On 1 April 2014, the Minnesota Wild of the National Hockey League (NHL) signed Folin as an undrafted free agent to a two-year, entry-level contract, and he made his NHL debut on 10 April 2014, notching an assist for the Wild in a 4–2 win over the St. Louis Blues.On 1 July 2017, Folin left the Wild as a free agent, opting to sign a one-year, $850,000 contract with the Los Angeles Kings.