The Desert Rats Trail Running Festival by UTMB, scheduled for April 30 through May 3 in Fruita, Colorado, occupies a unique position in the ultrarunning calendar: it is one of the few races in the world that serves as both a UTMB World Series qualifier and a Western States Endurance Run qualifying race. For ultra runners chasing spots at the two most prestigious events in the sport, Desert Rats offers an efficient and scenic path to both.
The 100k race takes runners through the red rock desert landscape of western Colorado, with a course that weaves through canyons, mesa tops, and single-track trails in the high desert terrain near the Colorado National Monument. The desert environment presents its own challenges — exposed terrain, limited shade, and temperature swings that can range from near-freezing at dawn to the high twenties by midday. Runners who succeed at Desert Rats tend to be those who manage heat, hydration, and pacing with discipline rather than relying solely on cardiovascular fitness.
The dual qualification pathway has made Desert Rats increasingly popular with serious ultrarunners. Finishing the 100k in under 20 hours earns a qualifying time for the Western States lottery, while the UTMB World Series points earned at the race contribute to a runner's ranking for the UTMB World Series Finals in Chamonix. In practical terms, a single strong performance at Desert Rats can advance a runner's standing in both of the sport's two dominant competitive ecosystems simultaneously.
The festival format adds to the appeal. In addition to the 100k, Desert Rats offers shorter distances including 50k and 10k options, making it accessible to runners at different stages of their ultra careers. The town of Fruita, a mountain biking mecca that has embraced the trail running community, provides a festival atmosphere that makes the event more than just a race. For the growing number of runners who view ultrarunning as a lifestyle rather than a single-day competition, Desert Rats delivers on every front.