Starting at 8,074 feet in the Sierra mountains, the Mammoth Gran Fondo delivers one of cycling’s most spectacular high-altitude experiences. What sets this event apart is that 75% of the route is closed to through traffic, allowing riders to fully absorb the stunning views of the Sierra Nevada, Mono Lake, and White Mountains without interruption.

The event offers three distinct challenges. The flagship Gran Fondo covers 102 miles with 6,643 feet of climbing, featuring a pro-style mass start and six fully stocked rest stops. The Medio spans 70 miles with 3,601 feet of elevation gain, highlighted by a narrow eight-foot bike path overlooking the Eastern Sierra and the climb to Watterson Summit—a 5% grade with 10% pitches that delivers one of Central California’s finest vistas. The accessible Piccolo route runs 42 miles through Jeffrey Pine forests with sweeping Eastern Sierra views.

Each course presents its own character of climbs and descents, with rest stops stocked with everything from boiled eggs and pizza to energy snacks. Unchained Bicycle Garage provides free on-course mechanical support, though riders should carry basic repair essentials.

Mammoth’s mountain climate demands preparation—cold mornings can shift to warm afternoons, with potential rain and persistent wind. The high elevation adds another layer of challenge that makes the stunning scenery feel well-earned.

After more than 30 years, this event has built a reputation for combining serious cycling with a welcoming atmosphere, capped by a post-ride celebration that brings together cyclists from across the region.