This challenging 27-mile single-track loop around Lake Sonoma delivers over 4,300 feet of elevation gain with no bailout points, making it strictly for experienced mountain bikers. The clockwise route starts at South Vista overlook and follows sections of the historic Tevis Cup horse race trail, combining flowing Northern California singletrack with relentless climbs and thrilling descents.

The course demands both physical endurance and technical skill as it winds through rugged terrain punctuated by steep, punchy climbs. A temporary bridge at Rancheria Creek ensures accessibility regardless of water levels, while the single-lap format with no turnaround keeps riders committed to the full distance. The route showcases Lake Sonoma’s natural beauty through captivating landscapes that provide visual rewards between the demanding segments.

Race organization includes comprehensive age group categories from U18 through 60+, plus M/F Pro divisions. A fully stocked midway aid station offers essential nutrition and hydration support during the grueling loop. The event atmosphere balances serious competition with community celebration, featuring a lakeside post-race lunch and Sierra Nevada beer for finishers.

For those seeking a less intense option, a shorter northern course provides Lake Sonoma’s signature terrain without the full endurance commitment, though it still delivers genuine challenge and shares the same finish line energy.

Part of the six-event Grasshopper Adventure Series, this race has earned recognition for its uncompromising course design that pushes experienced riders to their limits while maintaining the flowing singletrack that makes Northern California mountain biking legendary.