Little Costilla Peak is a 12,589-foot summit in the Culebra Range of northern New Mexico, in Carson National Forest northeast of Red River. It stands on the hydrological divide between Colfax and Taos counties and is the highest point in Colfax County. As the sixth highest major summit in New Mexico, it is especially notable both for its elevation and for its popularity as a hiking destination. Nearby Big Costilla Peak rises somewhat higher but is less prominent and lies to the northwest.