Cuyamaca 100K

Descanso, United States • 4 Oct 2025

The Cuyamaca 100K is an ultramarathon held in Cuyamaca Rancho State Park near Julian, California, about an hour east of San Diego. The race features a challenging 100-kilometer course composed of three distinct loops starting and ending at Camp Cuyamaca. The first loop covers 31.5 miles on the park's western side, including a climb to Cuyamaca Peak at 6,500 feet. The second loop spans 12.6 miles near Oakzanita Peak, while the final 18.3-mile loop traverses the northern park area, briefly entering Anza Borrego and following the Pacific Crest Trail with stunning desert views. The event offers a scenic, varied trail experience and serves as a qualifier for the 2026 Western States Endurance Run. Visit the organization's website for the most recent information.

Race information

100 km
6500 m+
100k
Visit the organization's website for the most recent information.
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