Castro went 2-for-2 with two RBI in Thursday's game against the Angels.
Castro signed a minor-league contract which includes an invitation to spring training with the Dodgers on Friday, Jorge Castillo of the Los Angeles Times reports.
Castro was designated for assignment by the Rockies on Saturday.
Castro was optioned to Triple-A Albuquerque on Tuesday, Patrick Saunders of The Denver Post reports.
Castro is hitting just .140 with the Rockies this season hasn't started since May 23.
Castro is in the lineup for the third game in a row Friday against the Mets, Patrick Saunders of The Denver Post reports.
Castro was reassigned to minor-league camp Sunday, Jenny Cavnar of AT&T SportsNet Rocky Mountain reports.
Castro seems to be in line for a roster spot to start the season if Pat Valaika (oblique) isn't healthy by then, Thomas Harding of MLB.com reports.
Castro was reassigned to minor league camp Monday, Patrick Saunders of The Denver Post reports.
Castro received an invite to Rockies spring training.