[1] During his senior year he was team captain and recorded 35 goals and 32 assists in 30 games, and helped lead the Bulldogs to their first state championship in school history in 2016.

With a year left of eligibility for AAA hockey, he tried out for and made the Victory Honda 18U team in Plymouth, Michigan.

For the 2017–18 season, Blankenburg played defense for the Okotoks Oilers, and recorded 16 goals and 26 assists in 57 games.

[14] Following the season he was named Honorable Mention All-Big Ten, and a finalist for the Senior CLASS Award.

[18] On April 8, 2022, Blankenburg signed a one-year, entry-level contract with the Columbus Blue Jackets for the remainder of the 2021–22 NHL season.

[22][23] On April 24, in his sixth game, Blankenburg's first career NHL goal was the game-winning power play marker in a 5–2 victory against the Edmonton Oilers.

He also appeared in 24 games for the Blue Jackets' AHL affiliate, the Cleveland Monsters where he recorded three goals and ten assists.

[29] On May 5, 2022, Blankenburg was named to the United States men's national ice hockey team to compete at the 2022 IIHF World Championship.

[31] Blankenburg's older brother, Alex, played college ice hockey for Omaha from 2015–19.