2008-09: Chris Casto played in 31 games for Hill-Murray School in Minnesota. He scored 4 goals with 27 assists as the Pioneers advanced to the high school state tournament after winning the Section 4 AA title. Hill-Murray lost to eventual state champion Eden Prairie, 3-2 in overtime in the state quarterfinals.
2009-10: Casto returned to Hill-Murray for his senior season — skating in 25 games as the Pioneers finished third in the Minnesota State AA tournament. He scored 11 goals with 17 assists and was an Honorable Mention all-state selection. Hill-Murray defeated White Bear Lake, 5-1, in the Section 4 AA championship game. After defeating Duluth East, 5-3, in the quarterfinals, the Pioneers lost to Minnetonka, 2-1, in a four overtime game in the semifinals. Hill-Murray defeated Apple Valley, 6-3, in the third place game. Castro committed to playing college hockey at Minnesota-Duluth in 2011-12 in January 2010.
2010-11: Casto was the second-leading scorer amongst defensemen for Lincoln in his first USHL season. He scored 6 goals with 19 assists and was +15 with 40 penalty minutes in 58 games for the Stars. Lincoln finished fourth in the Western Conference and was swept by Lincoln in a first round playoff series. Casto had no points and was -3 in the two-game series.
2011-12: Casto skated in all 41 games for Minnesota-Duluth as a freshman. he scored 2 goals with 11 assists and was +21 with 14 penalty minutes. The Bulldogs finished second in the WCHA and received an at-large bid to the NCAA tournament after a double overtime loss to Denver in the WCHA semifinals. The defending national champions topped Maine, 5-2, before a 4-0 loss to eventual national champion Boston College in the NCAA Northeast final.
2012-13: Casto signed a three-year entry-level contract with Boston in March 2013 and made his pro debut with Bruins AHL affiliate Providence following his sophomore season at Minnesota-Duluth. He had no points nor penalty minutes and was an even plus-minus in four AHL games. Providence finished first in the Atlantic Division and reached the second round in the playoffs.Casto did not play in any playoff games. In 36 games for Minnesota-Duluth in his final college season he scored 3 goals with 6 assists and was +1 with 16 penalty minutes. Minnesota-Duluth struggled for much of the season, finishing ninth in the WCHA, and was swept by Wisconsin in the first round of the WCHA tournament. The Bulldogs failed to win 20 games for the first time since 2007-08.
2013-14: Casto appeared in 53 games with Bruins AHL affiliate Providence in his first pro season, appearing in one game with the ECHL’s South Carolina Stingrays. A frequent healthy scratch for the P-Bruins early in the year, his role increased through the season. Casto scored 3 goals with 8 assists and was +8 with 23 penalty minutes. Providence finished third in the Atlantic Division and reached the second round in the playoffs. Casto played in all 12 playoff games and had an even plus/minus with 2 assists and 13 penalty minutes. He had no points nor penalties and was -2 in his only ECHL game with the Stingrays.
2014-15: Casto attended training camp with the Bruins before being assigned to AHL affiliate Providence. Skating in 62 regular season games in his second pro season, he scored 1 goal with 11 assists and was +17 with 35 penalty minutes. The Bruins finished second to Manchester in the Atlantic Division and lost to Hartford in a first-round playoff series. Casto was -2 with no points and 2 penalty minutes in five playoff games.
Casto is a big and smooth-skating defenseman whose skill level suggests he can be an effective two-way player at the NHL level one day. He does not play the punishing style often associated with a player his size and his defensive game remains a work in progress. He has improved in staying constantly involved in the play — an area of his game that was a concern early in his pro career.
Casto is skating for the AHL's Providence Bruins in 2015-16. Now in the third year of his original entry-level contract, he is the second-leading scorer amongst defensemen for Providence behind former San Jose Shark Matt Irwin. Yet to appear in an NHL game, Casto is still a work in progress in terms of consistency on the defensive end of the ice but his scoring ability suggests he can be an effective puck-moving defenseman. With the depth in the Bruins' organization he may have to head elsewhere to get that opportunity.