Elevation: 2,225 ft (678 m)
San Marcos Pass is a mountain pass in the Santa Ynez Mountains in California.
It is traversed by State Route 154. The pass connects Los Olivos and the Santa Ynez Valley with Santa Barbara, California. The road has been designated as a daylight-headlight highway by the California Highway Patrol and Caltrans because of frequent accidents, particularly around the exit for Lake Cachuma.
The pass is one of three passages across the steep Santa Ynez Mountains, and the nearest to Santa Barbara. The Painted Cave community and Laurel Springs Ranch near Chumash Painted Cave SHP is four miles east of San Marcos Pass via East Camino Cielo Road, which intersects with SR 154 right at the summit.