Diablo Marathon 2025

• Scenic Challenge: Trail through Mount Diablo State Park with stunning Bay Area views.
• Distance Options: Choose from 4 miles, 10 miles, half marathon, marathon, or 50K.
• Course Navigation: Clearly marked with ribbons; follow blue ribbons to avoid wrong paths.
• Essential Logistics: $6 parking fee; check-in 45 minutes before start at Mitchell Canyon.
• Safety Rules: No headphones on single-track trails; be courteous to others.

The Diablo Marathon offers a breathtaking challenge to trail-running enthusiasts with its rugged and scenic path on the trails of Mount Diablo. This marathon isn’t just a test of endurance, but also an opportunity to immerse oneself in the natural beauty of the San Francisco Bay Area and surrounding valleys.

Runners will face a course that is as demanding as it is rewarding, with a total elevation gain of 6,760 feet. Expect a varied terrain: the marathon blends single-track trails (28%) with dirt roads (70%), and a small section of asphalt (2%), each segment promising its own unique challenges and views.

Navigational aids in the form of color-coded ribbons appear approximately every 200 yards, guiding participants through a summit loop and several scenic sections. The event not only caters to seasoned marathoners but also welcomes trail running newcomers with its diverse distance options (4 miles, 10 miles, half marathon, and 50K).

In addition to being a physically demanding race, the Diablo Marathon is a philanthropic effort supporting Save Mount Diablo, an organization devoted to conserving this unique natural area. Participants will not only conquer physical peaks but contribute to the protection of one of California’s great natural treasures.

Every finisher earns a custom medal, with top performers receiving further accolades. The marathon’s community spirit, coupled with its magnificent setting and challenging terrain, promises a memorable experience for anyone up for the challenge.

For the Diablo Marathon in Clayton, California, during early September, expect temperatures between 57-81°F (14-27°C), with minimal precipitation and moderate humidity. Mornings are typically clearer, providing comfortable conditions for runners.

The Diablo Marathon offers an exhilarating adventure through the stunning landscapes of Mt. Diablo State Park. This challenging course begins and ends at the Mitchell Canyon Trailhead, taking runners on a journey through a mix of single track, dirt roads, and a touch of asphalt. With a formidable elevation gain of 6,760 feet, participants will experience both demanding climbs and exhilarating descents.

As you traverse the mountainous terrain, you'll be rewarded with breathtaking views of the San Francisco Bay Area and surrounding valleys—a true feast for the eyes. The course is well-marked, with ribbons every 200 yards and polka-dot flags at intersections to guide your way. Aid stations are strategically placed to support you, though their exact locations are a surprise along the journey.

In contrast to the REVEL Mt Diablo Half Marathon, which is known for its downhill profile, the Diablo Marathon's diverse elevation changes demand careful pacing and energy management. This race is not just about speed; it's about savoring the experience and tackling the terrain with strategy and resilience. Whether you're a seasoned marathoner or a trail enthusiast, the Diablo Marathon promises a memorable and rewarding challenge.

Visiting Clayton, California for the Diablo Marathon offers a delightful mix of outdoor adventure and cultural charm. Nestled near Mount Diablo, this area is a haven for nature enthusiasts. Mount Diablo State Park provides breathtaking views of the San Francisco Bay Area and is a must-visit for its panoramic vistas and vibrant spring wildflower displays. For those who love hiking, the Shell Ridge Open Space and Morgan Territory Regional Preserve offer additional trails and scenic landscapes.

Clayton's cultural scene adds another layer to the experience. The annual Clayton Art & Wine Festival celebrates local art and wine, while the Clayton Community Theatre and Clayton Museum provide insights into the town's rich heritage. Dining in Clayton is a treat, with local favorites like the Clayton Club Saloon and Clayton Pizza offering a taste of the region’s flavors.

While Clayton itself is a quaint town, nearby Walnut Creek and Concord provide a range of accommodations, making it easy to explore the area. Remember to check weather conditions and fire safety rules before hitting the trails. Embrace the community spirit by participating in local events, and enjoy the unique blend of natural beauty and cultural experiences Clayton has to offer.