menu account_circle

San Diego 100 Mile Endurance Run

Quick facts

Distance Ultra marathon

About San Diego 100 Mile Endurance Run

About an hour’s drive from San Diego, Lake Cuyamaca is a picture-book 110 acre lake that is proof positive that good things come in small packages. Situated at an elevation of 4600 feet in an Oak and Pine forest, it is surrounded on three sides by the 26,000 acre Cuyamaca Rancho State Park, which is 52% wilderness. Lake Cuyamaca is the perfect getaway for one day or up to ten nights. Few places in San Diego County offer the pristine views that greet your eyes wherever they may wander. 

Lake Cuyamaca is host to the The San Diego 100 ultramarathon. San Diego 100 starts and ends at Lake Cuyamaca, up in the mountains, with the majority of the race at 4-5,000 feet of elevation. The course covers four recreational areas in the east county mountains of San Diego: The Pacific Crest Trail (PCT), Noble Canyon, the Cuyamaca and the Anza Borrego State Parks, and Mt Laguna Recreational Areas.


San Diego 100 Mile Endurance Run

  • 160.934km



Lodging is available at Mt Laguna Lodge. Lake Cuyamaca has rental facilities for campsites and RV's. Cuyamaca Rancho State Park (Paso Picacho Campground) is only 3 miles from Lake Cuyamaca and has campsites and cabins to rent.There are several lodging options avaialble in the nearby town of Julian which is only 9 miles from the start. The Julian Chamber of Commerce website has many possibilities.

After Race Services

There is one outdoor shower which uses Lake Cuyamaca pumped water so you can use it to clean off near the finish line.

Aid Stations

There are 16 Aid stations that will have a minimum, water, electrolyte drink (Tailwind Nutrition), Clif Shots and Clif Blocs, coke, mountain dew, ginger ale, ice, electrolyte pills, fruit, salty food (eg chips, pretzels), cookies, sandwiches (PB&J), and some candies. Night time aid stations will have hot soup and hot drinks.

Award Medals

Sub 24-hour runners will earn the brass belt buckle and all sub-32 hour finishers will receive the bronze belt buckle. All finishers receive the embroidered race hoodie, finishers medal, and finisher's coffee cup.

Equipment Storage

Drop Bags must be deposited at appropriate aid station bin next to the Registration Tent. Drop bags that do not meet the size limitations will not be accepted. Drop Bags leave venue at 5:30 am. Drop bags will be returned to Lake Cuyamaca after the applicable aid station closes.

Maximum Time

32 hrs


Applicants must have completed an official 50 mile race in less than 13 hours from between January 1, 2015 through January 1, 2017. Anyone who has completed an official 100K or 100 mile run in the last 2 years (January 1, 2015 to January 1, 2017) is also qualified to apply.


Food and refreshments will be served beginning midnight Friday until the event ends. We will also have complimentary breakfast for all entrants pacers and crews on Saturday morning.


Lake Cuyamaca Recreation Area

Mount Laguna,us


Lake Cuyamaca

Mt Laguna Recreational Area

Pacific Crest Trail

Noble Canyon

Indian Creek Trails

Rancho Cuyamaca State Park 


The San Diego 100 course is a 90% single track mountain course which covers four recreational areas in the east county mountains of San Diego. The start and finish area are located at the south parking area of Lake Cuyamaca Recreational Area. The course includes trails traversing sections of the Pacific Crest Trail (PCT), Noble Canyon, the Cuyamaca and the Anza Borrego State Parks, and Mt Laguna Recreational Areas.

San Diego 100 Mile Endurance Run Trivia

San Diego is the eighth-largest city in the United States and second-largest in California.

The race information has been found on the official website of the event or through publicly available sources. Always refer to the official website the latest race information. Please let us know if any data is wrong or missing, by emailing us.