San Diego 100

San Diego 100 is a challenging 100-mile ultramarathon in Lake Cuyamaca, California, starting and finishing at the Lake Cuyamaca Recreation Area south parking near Julian. The loop course is about 90% single-track mountain trails, crossing four San Diego east county recreation areas and segments of the Pacific Crest Trail, Noble Canyon, Cuyamaca, and Anza-Borrego parks, with Mt. Laguna included.

Runners face hot, dry, technical terrain with roughly 15,400 feet of climbing and the same amount of descent, capped by a 32-hour limit. It’s a Western States 100 qualifier, celebrated for superb volunteers and support. Notable features include a 60+ early start and a Solo Division with unique awards. Visit the organization's website for the most recent information.