Chacón was Colorado's All-Star representative, having won 11 games before the All Star break; the only other Rockies pitchers to have done so through 2015 are Aaron Cook (2008), Jason Marquis (2009), and Ubaldo Jiménez (2010). He never got to pitch in the All-Star game due to a nagging elbow injury. He returned after the All-Star break and was winless in six starts, going 0-4. Chacon was then shut down for the rest of the season. He wound up finishing 11–8 with a 4.60 ERA.