Trails Challenge 50K/Half Marathon/10K/5K

20221223
2026-04-04

Apr 04, 2026 at 6:30 AM

1700 Castle Rock Rd

Walnut Creek CA, 94598

USA

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Entry Fee $45
(Lowest or Early Registration)

Entry Fee 2 $177
(Highest or Late Registration)

Prize Money: no

Distance(s):

10K
13.1M
50K
5K

Type: Trail

Starting Elevation: 540

High Point: 2250

Percent of the course on un-paved trails: 100%

First Year of the Event: 2010

Men's Record: 50K: Brett Rivers, 4:06:21 (2014)

Women's Record: 50K: Magdelena, 4:34:22 (2015)

Description:

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 have taken us from 6,788 acres of open space to over 120,000 acres of open space on and around the mountain!
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 of us to enjoy.
The longer you go, the more you see and experience! Courses are all on dirt trails, heading out from Castle Rock park in Walnut Creek, heading into Mount Diablo State Park — all the way to the summit for the 50K.