This species is endemic to Mexico and occurs along the Pacific coast from southern Sonora to the central coastal area of Guerrero, and part of the Balsas basin. There is an isolated population in the Cape Region of the Baja California peninsula, where it occurs in the Sierra la Laguna and from near San Jos del Cabo (Grismer 2002).
Rights Holder: International Union for Conservation of Nature and Natural Resources
Bibliographic Citation: Ponce-Campos, P. & Garca Aguayo, A. 2007.
Thamnophis valida. In: IUCN 2014 . IUCN Red List of Threatened Species. Version 2014.1 . <
www.iucnredlist.org>
