About This Race
The Mammoth Trailfest takes runners through the stunning Eastern Sierra high country, where volcanic peaks meet alpine meadows at elevation. Set against the dramatic backdrop of Mammoth Lakes, this race showcases some of California's most spectacular mountain terrain, with courses winding through forests of lodgepole pine and across granite slabs carved by ancient glaciers. The race draws runners seeking a true mountain experience in one of the West's most iconic trail running destinations. With its September timing, participants enjoy crisp mountain air and the possibility of early fall colors painting the aspen groves. The 12-hour cutoff for the 50K provides a reasonable challenge for most trail runners, while the technical terrain and sustained elevation demand respect. Mammoth Lakes sits at 7,880 feet elevation, making this a high-altitude event that tests runners' acclimatization as much as their fitness. The volcanic landscape offers unique geological features rarely found in other trail races, creating a distinctive racing experience in the heart of the Sierra Nevada range.
The 50K course traverses predominantly singletrack trails through diverse Eastern Sierra terrain, from dense coniferous forests to exposed volcanic ridgelines. Runners navigate 90% trail with minimal road sections, experiencing the full character of Mammoth's backcountry. The course design creates a challenging loop with significant elevation variation, though specific route details are not provided in the available data.
The terrain reflects Mammoth's unique volcanic geology, with runners likely encountering everything from pumice-covered trails to granite formations. Six aid stations provide support throughout the course, strategically positioned to assist runners through the most demanding sections of this high-altitude challenge.
Aid Stations
6 stations along the course
Aid Station 1
Aid Station 2
Aid Station 3
Aid Station 4
Aid Station 5
Aid Station 6
Practical Info
Cool to mild September mountain weather with temperatures typically ranging from 30s-40s°F at start to 60s-70s°F midday, with possible afternoon thunderstorms.
MMH - Mammoth Yosemite Airport
Mammoth Lakes offers extensive lodging from budget motels to luxury resorts, with many options within walking distance of the village core.
Best For
Notable Features
Set in the Eastern Sierra Nevada at high altitude, this race showcases Mammoth Lakes' unique volcanic landscape and alpine environment. The September timing offers ideal mountain weather and potential fall foliage, while the technical terrain and 7,880-foot base elevation create a distinctive challenge that tests both fitness and mountain running skills.