Cherry Creek Sneak (Awaiting 2028 Race Date)
Estimated date — the 2028 date has not yet been announced by the organizer. We've kept this event visible on the calendar around its usual weekend so you can plan ahead. Please check the official race website (linked below) before booking travel.Course Highlights The Cherry Creek Sneak is one of Denver’s oldest and most beloved springtime running traditions, held annually the last Sunday of April in the vibrant Cherry Creek North neighborhood. Courses of five distances wind through the tree-lined streets
Georgetown to Idaho Springs Half Marathon
Course Highlights The Georgetown to Idaho Springs Half Marathon — affectionately known as the GTIS Half — has been a Colorado running institution for nearly five decades. The point-to-point course follows the historic path of the Argentine Central Railroad through the stunning Clear Creek Canyon, connecting the Victorian mountain town of Georgetown to the gold-rush heritage town of Idaho Springs. The route follows the canyon’s gentle contours along Clear Creek, offering dramatic rock wall scenery, rushing whitewater, and views of Colorado’s
Aspen Backcountry Marathon
Course Highlights The Aspen Backcountry Marathon is one of Colorado’s most stunning trail races, utilizing the world-class trail network that surrounds the legendary resort town of Aspen. All three distances — the 50K, marathon, and heavy half-marathon — run almost exclusively on single-track dirt trails with diverse terrain: challenging climbs through aspen groves, high ridge traverses with panoramic views of the Elk Mountains, and technical descents back into the valley. The 50K distance includes an out-and-back to the McNamara Hut, part
Vail Hill Climb
Course Highlights The Vail HillClimb is one of Colorado’s most storied mountain running traditions, celebrating its 50th anniversary in 2026. The 12.2K (7.6-mile) course is a pure uphill race from the base of Vail Village at 8,160 feet to Mid-Vail at 10,254 feet — a relentless 2,128-foot climb. The route follows the same gravel and dirt service road that has been used since the race was founded in 1976, with 80% dirt/gravel and 20% paved sections. Runners work through dense spruce-fir
Slacker Half Marathon
Course Highlights The Slacker Half Marathon earns its name — runners start at the base of Loveland Ski Area at a breathtaking 10,630 feet elevation and ride a net-downhill course all the way to Georgetown at approximately 8,400 feet, losing nearly 2,200 feet over 13.1 miles. The course is a thrilling mix of dirt and paved roads, guiding participants through pristine alpine wetlands and wildflower meadows, past natural waterfalls, dramatic views of the Continental Divide, and through remnants of Colorado’s historic
Pikes Peak Marathon & Ascent
Course HighlightsThe Pikes Peak Marathon and Ascent represent the gold standard of American mountain running. The Ascent covers 13.32 miles from downtown Manitou Springs (6,286 feet) to the 14,115-foot summit of Pikes Peak — America's most famous fourteener — gaining 7,867 feet in a single unrelenting climb over Barr Trail. The full Marathon adds the return trip, demanding runners descend the same brutal trail for a round-trip of 26.2 miles and 7,834 feet of gain and loss. The course passes
Colfax Marathon Relay
Course HighlightsThe Colfax Marathon Relay lets teams of five runners share the full 26.2-mile Colfax Marathon course through Denver's most iconic landmarks. The relay is divided into four legs, sending runners through Empower Field at Mile High on the warning track, along the bustling Colfax Avenue past the State Capitol and VooDoo Donuts, through a full mile inside Denver Zoo with live animal spectators, around Sloan's Lake with Rocky Mountain views, and through Lakewood before returning to the City Park
Colorado Marathon Relay
Course HighlightsThe Colorado Marathon Relay gives teams of runners the chance to tackle Colorado's most scenic downhill marathon course together. Relay teams are divided across the dramatic point-to-point course that descends from the Rocky Mountain foothills through the Cache la Poudre River Canyon — a designated Wild and Scenic River — all the way to the finish line in Washington Park in Old Town Fort Collins. The canyon section features rushing whitewater rapids, dramatic sandstone walls, and cottonwood groves; the
Quad Rock 50 & 25 Mile
Course HighlightsThe Quad Rock 50 and 25 mile trail races take place entirely on the premium singletrack trails of Lory State Park and Horsetooth Mountain Park, just west of Fort Collins in the northeastern Colorado Rockies. The 25-mile course features three major climbs and descents totaling over 5,500 feet of vertical gain on 85% singletrack and 15% dirt road, running clockwise from Soldier Canyon. The 50-mile course runs the 25-mile loop twice in opposite directions, accumulating over 11,000 feet of
Horsetooth Half Marathon
Course HighlightsThe Horsetooth Half Marathon is one of the most respected and competitive half marathons in the Mountain West, drawing elite runners and serious age-groupers to the foothills west of Fort Collins each spring. The point-to-point course starts on Dixon Canyon Road in the hills above Horsetooth Reservoir at approximately 6,000 feet, descends through dramatic red rock canyon scenery with views of the reservoir, and finishes at the iconic New Belgium Brewing Company in Fort Collins. The course features +917