San Diego 100
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San Diego 100 - May 1-2, 2026
The San Diego 100 is a 100 mile loop trail race based at the south parking area of Lake Cuyamaca Recreation Area, located about 9 miles southwest of Julian, CA on state Highway 79. The course is approximately 90% single track and crosses sections of the Pacific Crest Trail, Noble Canyon, Cuyamaca and Anza Borrego state parks, and Mount Laguna recreational areas. The route includes roughly 15,400 feet of ascent and the same amount of descent, runs in hot and dry mountain conditions, and has a 32 hour time limit. The event is a qualifier for Western States 100.
Distances:
- 100 Miler Crewed
- 100 Miler Solo
Registration opens January 1, 2026 at 12:01 AM and remains open until the race reaches 300 entrants on a first come, first served basis or until April 1, 2026. Applicants must show a qualifying performance: a 50 mile finish under 13 hours between January 1, 2024 and April 1, 2026, or a 100K or 100 mile finish within that race's time limits in the same period. Entrants must complete six hours of trail maintenance or volunteer service between June 1, 2025 and May 1, 2026, or donate $100 to Trailfit; this requirement is strictly enforced. The Solo division requires runners to rely on drop bags and aid stations, allows spectators only at start and finish, and includes a $10 discount for Solo entrants. Visit the organization's website for the most recent information.
