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. Event Schedule: 6:30 AM - 50K 7:30 AM - Hiker Division (Half
Early Start) 8:30 AM - Half Marathon 9:00 AM - 10K 9:30 AM - 5K Click
Here for Registration:
Free time
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09/07/2025 Last update