During an 18-month sampling effort along the Río Sabinas in Coahuila, Mexico (December 2004–August 2006), we observed eight confirmed and three potentially new breeding records, nine new non-breeding records, and eight rare records of birds for Coahuila. We also identified the Río Sabinas as a potential new breeding site in the state for five species. These data illustrate the considerable conservation value of this understudied area in northern Mexico.