Costilla County lies in south-central Colorado within the San Luis Valley. It covers nearly 1,227 square miles and ranges in elevation from 8,400 to 10,300 feet. Costilla County borders Conejos County to the west, Alamosa County to the northwest,…

Covering nearly 8,000 square miles in southern Colorado, the San Luis Valley is the largest valley in the state and the largest high-altitude desert in North America. Known as “the Valley” by locals and other Coloradans, the San Luis Valley is bordered…