The Cuyamaca 100k, set for October 3, 2026, in Julian, CA, offers ultra-runners a formidable 100-kilometer challenge through the diverse and stunning landscapes of Cuyamaca Rancho and a small portion of Anza Borrego Desert State Parks. This esteemed event is not only a true test of endurance but also a qualifier for the iconic Western States 100. Runners will embark on an unforgettable journey starting and finishing at Camp Cuyamaca, known for its excellent facilities and vibrant race atmosphere.

The course is meticulously crafted into three distinct loops, designed to minimize backtracking and maximize scenic variety. The cumulative elevation gain is approximately 8,800 feet, featuring significant climbs including the park's highest point, Cuyamaca Peak, at 6,500 feet. Runners will navigate a mix of technical singletrack, rolling fire roads, and varied terrain, transitioning from lush oak woodlands and pine forests to chaparral and even experiencing breathtaking desert views along sections of the Pacific Crest Trail. Aid stations are strategically placed and highly praised, offering essential sustenance like water, Tailwind Nutrition, Huma Gels, fruit, salty foods, and sweets, supported by an exceptional volunteer crew.

What truly sets the Cuyamaca 100k apart is its unique three-loop structure, allowing runners to return to the central Camp Cuyamaca between loops, and a clear, color-coded marking system for seamless navigation. Typical race day conditions in early October are ideal for ultrarunning, with historical highs around 75°F and lows near 53°F, accompanied by a minimal 2% chance of precipitation, providing a comfortable environment for this demanding race. The event is celebrated for its world-class organization and commitment to supporting the Cuyamaca Outdoor School and Runners for Public Lands, adding a meaningful dimension to your accomplishment.