Challenge yourself on America's most rugged ultra-endurance mountain bike race.

The Maah Daah Hey 100 is an iconic mountain bike race traversing the remote and picturesque Badlands of North Dakota along the legendary Maah Daah Hey Trail—the longest contiguous single-track trail in the U.S. The 2025 event kicks off on August 2 at 6:00 AM MDT, offering ultra-endurance racers and adventurous riders the chance to tackle 13, 25, 50, 75, or the full 100-mile course. Riders can expect strenuous climbs, thrilling descents, and endless views, making this a true test of determination and grit. Whether you're chasing a belt buckle, a personal best, or the sheer thrill of finishing, this event is considered one of the most challenging—and rewarding—mountain bike races in America.

The course covers portions of the Maah Daah Hey Trail, with distances of 13, 25, 50, 75, or 100 miles, each featuring a variety of rugged single-track trail, steep climbs and descents, and exposed grassland. The 100-mile route offers over 13,000 feet of elevation gain, winding through the most scenic and demanding stretches of the Badlands. Riders must be self-sufficient, and the remoteness of the trail adds an extra layer of challenge and adventure.

• Traverses the longest contiguous single-track trail in the U.S. (Maah Daah Hey Trail).
• Extreme challenge: over 13,000 feet of climbing on the 100-mile course.
• Spectacular Badlands scenery and panoramic vistas.
• Finish the 100-mile race under 10 hours to earn a custom belt buckle.
• Renowned as one of the nation’s toughest ultra-endurance MTB events.
• Multiple race distances for all skill and endurance levels.