The Rockies purchased Freeland's contract from Double-A Hartford on Sunday.
An encouraging spring training performance (3.48 ERA over 20.2 innings) landed Freeland a spot in the team's Opening Day starting rotation. The 23-year-old posted a 3.91 ERA over 73.2 innings with Triple-A Albuquerque in 2016. He's scheduled to make his MLB debut in the Rockies' home opener April 7 against the Dodgers.