The Rockies selected Kitchen's contract from Triple-A Albuquerque on Saturday.
Across 23 games in Triple-A this season, Kitchen has a 3.00 ERA and 1.27 WHIP over 33 innings. He will provide the Rockies with a southpaw option out of the bullpen. To make room for Kitchen, Colorado designated right-hander Geoff Hartlieb for assignment in a corresponding move.