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.

The 2023 event is scheduled for Saturday, 10/7, and registration will open April 1st at 6am PST.

Runner FInishing Loop 2, awards for top 3 runners, right and above, photos by Ilian Moctezuma

Teresa Kaiser descending from Cuyamaca Peak, photo by Paksit Photos.

Cuyamaca Outdoor School
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

San Diego Ultra Slam
The RD's of San Diego's mountain ultra races have put together a special award for those runners who complete four races of each iconic ultra distance; 50k, 50 miles, 100k, and 100 miles. Please visit for more information.