Diablo Trails Challenge

APR
4
2026
Read all about the Diablo Trails Challenge on 4 Apr 2026 in Walnut Creek.
Sat 4 Apr 2026
50 kilometers Half Marathon 10 kilometers 5 kilometers

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Diablo Trails Challenge : April 4, 2026

The Diablo Trails Challenge is a trail running event on Mount Diablo in Walnut Creek, California, held on April 4, 2026. It is organized by Brazen Racing and takes place at 1700 Castle Rock Road. The event includes multiple trail race distances and supports the land-conservation group Save Mount Diablo; a portion of entry fees is donated to that organization. The race is part of the Brazen Ultra Half Series, and half marathon runners are invited to participate in the series.

Distances, entry and extras

  • 50K
  • Half Marathon
  • 10K
  • 5K

There is also a Remote Runner option and a purchasable BBQ lunch plate. Registration fees are listed with staged price increases; current starting prices shown on the entry page include: 50K $159.17, Half Marathon $105.80, 10K $86.58, 5K $76.98, Remote Runner $50.29, and BBQ plate $23.60. The event provides race information pages for course details, bib pick-up, photos, results, and volunteer opportunities. Visit the organization's website for the most recent information.

50 km
50k
Half Marathon
Half Marathon
10 km
10k
5 km
Remote Runner

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