Diablo Trails Challenge
Walnut Creek, California, United States
Apr, 2027 (TBD)
5k, 10k, 50k, Half-marathon, Ultra
Race Information
For over 50 years, Save Mount Diablo has worked tirelessly to preserve and increase the open space on and around Mount Diablo. In that time, their efforts increased the open space on and around the mountain from 6,788 acres to over 120,000 acres!
With distances suitable for everyone, from those hitting the trails for the first time to experienced ultra-runners, the Diablo Trails Challenge was created to help celebrate and support these achievements. A portion of all entry fees will go to Save Mount Diablo to help them continue preserving open space and trails for all to enjoy.
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👍 Run Pick of the Month: Santa Cruz Marathon
📍Santa Cruz - Sunday October 25, 2026
😄 Why We Like This Run
✅ Three epic distances
✅ A world-class coastal course
✅ The ultimate surf-town vibe
Experience the magic of the Pacific coastline at the Santa Cruz Marathon, a brand-new race event celebrating the heart and soul of California’s favorite surf town. Trade the concrete jungle for ocean breezes and iconic scenery and experience a race day like no other.
Whether you're lacing up for your first race or chasing a personal best, you're invited to be part of history. Join in the inaugural 2026 edition and secure your place in the record books with an exclusive, one-time inaugural finisher medal.
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Race Facts
Race Size: 100 - 500
Elevation: Some Hills
Course Type: Trail
Boston Qualifier: No
Kids Run: No
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