In an effort to assess the current geographic distribution of the critically endangered frog Telmatobufo bullocki Schmidt, 1952, we conducted several field surveys in the Nahuelbuta mountain range in central-south Chile. We surveyed historic localities cited in the literature, and potential new localities in private forestry areas. Telmatobufo bullocki was found in six localities: four historic and two new. The discovery of new populations and the confirmation of the persistence of the species in at least four historic localities open new perspectives for the conservation of this threatened species.