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Diablo Summit Stomp

Quick facts

Distance Marathon

About Diablo Summit Stomp

An urban oasis surrounded by unspoiled hillsides, Walnut Creek is embraced for its mild Mediterranean climate and picture perfect setting at the foot of Mount Diablo.

Walnut Creek offers a distinctive blend of urban flair, suburban grace and peaceful wilderness. With its central Bay Area location and easy access to BART and major roadways, Walnut Creek is your perfect getaway in San Francisco’s East Bay for shopping, dining, the arts and the outdoors.

Race organizers say runners need to be ready to “get dirty on Diablo” when they climb the sometimes steep hills and valleys at the Diablo Summit Stomp, which takes runners up the slopes of Mount Diablo, which sits at an elevation of about 3,849 feet above sea level in the middle of California’s Mount Diablo State Park.



  • 5km


  • 10km


  • 30km

Half Marathon

  • 21.097km


Aid Stations

As with all of our races, aid stations will be fully stocked with water, sports drink, gels, pretzels, candy, etc. Runners who may need more water, should carry their own water bottle.

Award Medals

Custom finisher medals will be given to all finishers. Awards will be issued to the overall male/female winners of the Half Marathon, 10K and 5K, courtesy of Forward Motion Sports. Age-group medals (3 deep) will be awarded in the following categories: 8 and under 9-12 13-17 18-24 25-29 30-34 35-39 40-44 45-49 50-54 55-59 60-64 65-69 70-74 75-79 80-84 85-89 90 and older.

Maximum Time

6.5 hours course limit.


Castle Rock Park

Castle Rock Park,us


One of the San Francisco Bay area’s most beautiful parks, Mount Diablo is known for its distinctive rock formations and is filled with miles of trails for hiking, walking, horseback riding and camping. The race is billed also as the “Save Mount Diablo” race, to raise funds to help protect the environment here on the mountain and in the surrounding park area.


The half marathon course starts at the Castle Rock Park area of the park, just off Castle Rock Road in the northwest corner of the park.

From there, the course follows a course that takes runners southward and westward along the fire roads that lead through mountainous terrain, with plenty of water crossings and muddy and rocky areas, all the way up the slopes of Mount Diablo.

The course follows an out-and-back loop route, and returns back to the starting line for the finish along Pine Ridge and through Pine Canyon.

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.