The 2026 Mt. Diablo Summit Challenge is scheduled to take place on March 21 in Clayton, United States, within the scenic Diablo National Park in Northern California. The event will start at Mitchell Canyon Road, offering participants a unique opportunity to traverse an out-and-back mountain trail that ascends to the summit of Mt. Diablo. On this date, the expected weather in Clayton is likely to be mild, with temperatures ranging between 50°F and 60°F (10°C to 15°C) and partly cloudy conditions. The 14-mile (22.5-kilometer) course features a significant elevation gain of 3,280 feet (1,000 meters), combining trail running and mountain hiking elements. Participants can expect a physically demanding but rewarding route that offers panoramic 360° views of the Bay Area from the summit. Aid will be available at the summit with water and drinks, and a hot meal and drinks will be provided at the start and finish area.
What is the format of the Mt. Diablo Summit Challenge?
→The event is an out-and-back mountain trail, starting at Mitchell Canyon Road and ascending to the summit of Mt. Diablo before returning along the same route.
What is the distance and elevation gain for this event?
→14 miles (22.5 kilometers)
→3,280 feet (1,000 meters) of elevation gain
What type of terrain will participants encounter?
→Mountain trail combining elements of trail running and mountain hiking; the route profile is simple but physically challenging due to the sustained climb.
What aid and support will be available during the event?
→A "NOMADIC AID STATION" at the summit will provide water and drinks.
→A traditional hot meal and drinks will be served at the start/finish area upon completion of the course.
When is the event scheduled to take place?
→The event is scheduled for March 21, 2026, starting at 9:00 AM.
What is the registration process for the event?
→Registration is only available through UltraSignup at Register Here ↗.
→No race-day registration is available; advance registration is required.
How much does registration cost?
→The entry fee is $30.00, with taxes and fees bringing the total to $33.50.
Are there any restrictions on participation?
→Participant limits are strictly enforced due to limited permits from Diablo National Park.
→Parking regulations also apply, and advance registration is required to ensure compliance.
Who organizes the event?
→The event is organized by the Nomadic Adventure Club.
What is the purpose of the Mt. Diablo Summit Challenge?
→The event is designed to welcome both trail runners and hikers, encouraging exploration of ultra/trail running while honoring the club's mountain hiking roots.
What can participants expect from the course?
→Participants can expect a challenging out-and-back route that ascends to the summit of Mt. Diablo, offering 360° views of the Bay Area from the iconic summit.
