Peralta was optioned to Triple-A Albuquerque on Thursday.
Peralta will head back to Albuquerque after serving as the Rockies' opener in Tuesday's 10-0 loss to the Rangers, giving up two runs on two hits and two walks while striking out a batter and hitting another over two-thirds of an inning. In corresponding move, Blas Castano was recalled from Triple-A to replace Peralta in the big-league bullpen.