San Juan Solstice 50

2026

The San Juan Solstice 50 takes place on the summer solstice in Lake City, Colorado, offering runners 16 hours to complete 50 miles through the San Juan Mountains. The course features long stretches between aid stations, including a 10-mile gap from Carson to Divide and a 9-mile stretch from Divide to Slumgullion, with limited crew access until later in the race. Running at altitude in the San Juans means dealing with thin air and the potential for rapidly changing mountain weather, even in June. The route passes through varied terrain typical of this rugged range, from forested sections to exposed high country. One aid station, Alpine Gulch, requires runners to pack everything they need, adding a self-sufficiency element to the early miles. Pacers are allowed starting at mile 40, which coincides with the Slumgullion aid station where crews can finally provide support. This race suits experienced ultrarunners comfortable with long, unsupported stretches and high-altitude running. The lottery system and 300-runner cap reflect its popularity among those seeking a challenging mountain ultra without excessive crowds. Runners who prefer frequent aid or struggle with altitude should consider other options.