Embark on an unforgettable trail running adventure at Mammoth Trailfest, set for September 25, 2026, in the stunning high-alpine environment of Mammoth Lakes, CA. This multi-day festival celebrates the spirit of trail running with an inclusive community atmosphere, offering both a challenging 50K and a demanding 26K race through breathtaking Eastern Sierra landscapes. Typical race day conditions in late September offer crisp mountain air, blue skies, and mild temperatures, with highs around 73°F and lows around 42°F, and a minimal 2% chance of precipitation, providing an ideal backdrop for mountain running.

The courses are meticulously designed single-loop journeys, starting and finishing in the vibrant Village Plaza. The 50K, California's highest ultra, boasts nearly 7,000 feet of vertical gain, with an average elevation exceeding 9,100 feet and topping out at 11,053 feet. Runners will navigate a diverse mix of buttery singletrack, rocky technical trails, soft pumice, and even some bike path, all while encountering seven spectacular alpine lakes and a significant climb up the world-famous Dragon's Back Trail to the summit of Mammoth Mountain. The 26K is equally rewarding, featuring over 3,800 feet of vertical gain and also summiting Mammoth Mountain, offering a faster yet intense experience. Both distances are praised for their flawless course marking and prioritization of flow and scenery over contrived difficulty, ensuring an inspiring challenge for all.

Mammoth Trailfest is renowned for its exceptional runner support and vibrant community spirit. Aid stations, strategically placed and well-stocked, offer a generous array of sweet and salty snacks, fruit, water, and GU Energy products, including "summit pancakes" on the 50K course, all while encouraging a cup-less event. The festival extends beyond the races with free live entertainment, storytelling, and local food, fostering an atmosphere where every participant, from elite athletes to first-time trail runners, feels welcomed. Many runners consistently highlight the incredible organization, the non-elitist vibe where cheers are loudest for the final finishers, and the unique experience of ultrarunner Tim Tollefson personally greeting every finisher at the line. This event promises not just a race, but a full mountain running celebration designed to leave you equally exhausted and inspired.