Pajarito was originally established by workers and soldiers at the Los Alamos Laboratory, who during World War II found themselves stuck in the area while working on the Manhattan Project. They formed the Los Alamos Ski Club in 1944. This member-driven operation first started on a nearby hill but moved to 10,441-foot Pajarito Mountain in 1957.

Pajarito is open Friday through Sunday, Federal holidays, and throughout the Christmas holiday period except for Christmas itself. The broad profile of the mountain encompasses about 280 acres of terrain and 40 named trails. A quad, a triple, three doubles, and two rope tows serve up to 1440 vertical feet.

The skiing and riding are mostly in the upper intermediate to advanced vein, with a few long green trails that will delight solid beginners who would like a long and satisfying run. True novices had best stick to the learning terrain above the lodge. The black diamond terrain lies in the center of the mountain on either side of the Aspen Lift where a steep fold harbors favorites like Wildcat, Lumberyard, and Mal's Run. Much of the black diamond stuff is allowed to get bumped up.