Cuyamaca 100k
San Diego, CA
Oct 3, 2026
An adventure through the San Diego mountains
Since 2012, the Cuyamaca 100k Endurance Run has been providing runners with a scenic 100 kilometer running challenge. The course traverses a diverse landscape of oak woodlands, meadows, pine forests, and chaparral in the Cuyamaca Rancho and Anza Borrego Desert State Parks.
WSER Qualifier
The Cuyamaca 100k in 2026 is a 2027 Western States qualifier.
Runners for Public Lands
Cuyamaca 100k is a proud supporter of Runners for Public Lands, a nonprofit focused on climate action, sustainability practices, the protection of public lands, and equitable access to nature.
Supporting Outdoor Education
Since 2012, the Cuyamaca 100k has benefited from the support of the Cuyamaca Outdoor School. The venue and facilities that host our race are home to a 6th grade camp program that has inspired the love of the outdoors in thousands of students over the course of the 70+ years. Please join us in supporting the outdoor education of San Diego's youth at sixthgradecamp.org.
SPONSORS
Hero photo by race photographer Paksit Photos.