Trail Running calendar near Golden 2025-2026

Niwot's Challenge is a unique, invitation-only endurance event held annually near Sedalia, Colorado, along the South Platte River in the Front Range. Unlike typical races, it emphasizes self-reliance, navigation, and mental toughness over speed. The course is a secret, off-trail gauntlet requiring m..

The Greenland Trail Races, held annually in May at Greenland Open Space in Larkspur, Colorado, offer four race distances: 4 miles, 8 miles, 25K, and the 50K ultramarathon, known as Colorado's fastest 50K. The course features wide, smooth dirt trails through native grasslands, oak hills, and ponderos..

The Valkyrie Trail Race, held in Cheyenne Mountain State Park near Colorado Springs, Colorado, is a women-focused trail running event offering multiple distances ranging from 4 miles to 50 kilometers. The course begins on crushed limestone meadows before transitioning to singletrack trails ascending..

Endure Trail Runs, part of the Human Potential Running Series, is held annually at Mueller State Park near Divide, Colorado. The event offers multiple distances including a unique 12-Hour timed run, a marathon, half marathon, and 10k, all featuring scenic courses on double-track and single-track tra..

The Summits Trail Runs, held at Granby Ranch Resort in Colorado’s Rocky Mountains, offer a challenging series of trail races with distances from 6 miles to ultra distances including a 50k and a 12-hour Elevation Challenge. The courses feature rugged alpine terrain, single-track trails, alpine meadow..