Logo

Cuyamaca 100K

Descanso, United States • 3 Oct 2026

Event

The Cuyamaca 100K is a 100-kilometer trail race in Julian, CA, held within Cuyamaca Rancho State Park. The race is a Western States qualifying event. The start and finish are at Camp Cuyamaca off Highway 79. The park is approximately one hour east of San Diego.

Course

The course is made up of three distinct loops that start and end at Camp Cuyamaca, with minimal backtracking or repetition.

  • First loop - 31.5 miles; western side, approaches Cuyamaca Peak (6,500 ft)
  • Second loop - 12.6 miles; southeast corner near Oakzanita Peak
  • Third loop - 18.3 miles; northern park section, briefly enters Anza Borrego and follows the PCT, then returns to the northern meadows

Registration and volunteers

Registration opens Wed. Apr 1, 2026 at 6:00 AM PT. A volunteer form is available for those who wish to help at the race. Visit the organization's website for the most recent information.

United States California Descanso

Race information

Website Registration
100 km
100k
Visit the organization's website for the most recent information.
Trail runs nearby

Sycamore Canyon

Poway

Challenge yourself at Sycamore Canyon in Poway CA on Feb 28, 2026 with looped 100K and 50K ultradistance options plus a half marathon at Goodman Ranch Preserve. Solo and 4 person relay entries available for the ultras.

Ranch to Ranch

Alpine

Ranch to Ranch brings you rugged single track trails between working ranches in scenic Japatul Valley, with distances from a fun kids 2K to a challenging 15K. Enjoy a lively ranch vibe, team competition, and sweet swag including long sleeve..

Old West Trail Runs

Julian

Run 50K, marathon, or half marathon in Anza Borrego Desert State Park, starting and finishing at Stagecoach Trails RV Resort. Sandy jeep roads and singletrack deliver stunning desert scenery and a SoCal Ultra Series qualifier.

Pirate's Cove 6/12/24 Hour Run/hike

Julian

Test your endurance at Pirate's Cove, a timed run and hike at scenic Lake Cuyamaca with 6, 12 and 24 hour options. Cupless event with campground HQ and camping; bring your own cup or buy a souvenir. Military and veteran discounts available.