The Original Growler is an endurance mountain bike race event in Gunnison, Colorado, organized to support Gunnison Trails, a 501(c)(3) nonprofit trail advocacy organization. The event offers riders a challenging, singletrack-focused experience on trails in the Gunnison area, with the next race scheduled for May 29–30, 2027. Its broader program includes race details, schedules, course maps, camping information, results, photos, and volunteer opportunities.

The Growler serves as Gunnison Trails’ primary fundraiser. All proceeds from participant entry fees benefit the nonprofit’s work to maintain and expand local trails, including the development of more than 10 miles of singletrack in the Signal Peak area behind Western Colorado University. The event also brings participants together for post-race food, drinks, and camaraderie in downtown Gunnison. In addition to the race, the site promotes the Flow State Mountain Bike Festival, held May 27–30 at the I-Bar Ranch, with tickets available for purchase. The organization’s focus is on supporting both an engaging riding experience and the continued growth of Gunnison-area trails.