The deal with the 24-year-old, signed by the Blackhawks as a free agent in April 2015, runs through the 2018-19 season. Terms of the deal announced Thursday weren't disclosed.
Kero, one of seven rookies to play for the Western Conference-leading Blackhawks this season, has five goals and seven assists in 38 games. He was recalled from Rockford of the AHL on Dec. 22 when he was leading the IceHogs with 20 points on seven goals and 13 assists.
Kero played four seasons at Michigan Tech, located in Houghton, Michigan, and just across the Keweenaw Waterway from his hometown of Hancock.
A 2015 Hobey Baker Award nominee, Kero was named the Western Collegiate Hockey Association's Player of the Year during his senior year when he led the Huskies with 20 goals and 46 points.