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.
Will play his first pro-season in 2013-14. Castro could split time between the AHL and ECHL. He will need sometime in the minors, and may be a depth defenseman at best.