What distances are available at Diablo Trails Challenge?

The listed distances are 5K, 10K, Half, 50K.

Diablo Trails Challenge 2026–2027: Date, Distances & Registration

Q: How do I register for Diablo Trails Challenge?

Use the official registration link. Save Mount Diablo handles registration, payment, waivers, transfers, cancellations, and refunds.

Trail race guide

Diablo Trails Challenge: date, distances, elevation, and registration

Diablo Trails Challenge is a very hard trail race organized by Save Mount Diablo. It offers 5K, 10K, Half, 50K distances on Saturday, April 3, 2027.

Date: Saturday, April 3, 2027
Location: Castle Rock Recreation Area · Walnut Creek
Distances: 5K · 10K · Half · 50K
Elevation gain: 5K ~280′ · 10K ~910′ · Half ~2,400′ · 50K ~7,010′
Difficulty: Very hard
Registration: Registration open
Official source: Save Mount Diablo · Verified Aug 30, 2026

Questions about Diablo Trails Challenge

When and where is Diablo Trails Challenge?

Diablo Trails Challenge is scheduled for Saturday, April 3, 2027 at Castle Rock Recreation Area · Walnut Creek.

How do I register for Diablo Trails Challenge?

Use the official registration button on this page. Registration, payment, waivers, transfers, cancellations, and refunds are handled by Save Mount Diablo.

What distances are available?

Diablo Trails Challenge currently lists 5K, 10K, Half, 50K.

Can I invite a friend?

Yes—use the prefilled text or email invitation. It includes the race date, a suggested distance, and this guide.