Tahoe Rim Trail Endurance Runs 2026

The Tahoe Rim Trail Endurance Runs are a series of high-altitude trail races on the Nevada side of Lake Tahoe, offering 100 Mile, 100K, 50K, and 23K distances. The longer distances are firmly in ultrarunning territory; the 100 Mile route involves over 18,000 feet of elevation change, and runners maintain an average elevation around 8,300 feet. The event typically occurs in July. Historically, the 100 Mile has been a Western States 100 qualifier, and fast 100K finishers can also earn a qualifying mark. The course crosses Spooner Nevada State Park and adjacent U.S. Forest Service land, including backcountry terrain near the Diamond Peak area. The race's slogan, “a glimpse of heaven, a taste of hell,” reflects the combination of Lake Tahoe vistas, thin air, extended climbs, and challenging footing. Participants receive buckles upon finishing. The 100 Mile, 100K, and 50K races award Ultra-Trail du Mont-Blanc index points. Race reports highlight well-supported aid stations, dedicated volunteers, and a field comprising serious ultrarunners alongside those aiming for a demanding mountain finish.