Ardoin next signed with the Colorado Rockies as a free agent in 2005 and began the season with the Colorado Springs Sky Sox. He was called up to the Rockies because of poor performance by the starting catcher J.D. Closser and an injury to backup Todd Greene. Ardoin set career highs in every offensive category, despite playing regularly in only the second half of the season. He compiled a .229 batting average with 6 home runs and 22 runs batted in.