Trail Running Calendar Colorado 2026-2027

Welcome to Colorado's premier trail running calendar for 2026-2027! Recognized as a trail runner's haven, Colorado seamlessly blends bustling urban settings with pristine mountain terrains. Whether you're a native, a newbie, or a visitor exploring the Centennial State's running trails, our calendar ensures you don't miss out on any event.

Denver, the renowned Mile High City, beckons runners with its urban-meets-nature charm. Iconic routes like the Cherry Creek Trail zigzag right through the city's pulse. Venturing south, Colorado Springs, dubbed the "Olympic City", boasts of trails skirting the monumental Garden of the Gods. Here, a run transcends the ordinary, offering an experience akin to striking gold.

For those seeking a quiet escape, Aurora presents peaceful reservoir paths, making urban detox achievable. If the allure of academic vibes mixed with nature captivates you, Fort Collins and its famous Horsetooth Reservoir trails won't disappoint. Meanwhile, Lakewood introduces runners to nature's canvas with the Red Rocks painting every run. And let's not forget Boulder, offering a diverse range of trails set against the stunning backdrop of the Flatirons.

Kessel Run Ultra in Fruita Colorado on Nov 7 2026 offers 10 to 50 mile options on fast flowing singletrack through high desert and Colorado National Monument scenery. Expect steep climbs, flowing trail and big mountain views.

Nov 7, 2026 in Lone Tree CO, tackle a scenic single loop 13.1 mile course on dirt and singletrack through Highlands Ranch Backcountry Wilderness. Aid stations, tech shirt, finisher medal, pancake breakfast, post race beer and cash prizes.

Join the Louisville Trail Race on November 14, 2026 in Louisville, Colorado, with half marathon, 10K and 5K trail distances over scenic dirt paths and rolling climbs. This cupless race offers timed courses for all levels.

The Colorado Cold Rush Ultra will take place in West Colorado Springs on Saturday 21 November 2026. You can run between 10 and 50 kilometers.

December 2026

The Sawmill Trail Runs will take place in Pine Junction Area on Saturday 5 December 2026. You can run between 8 and 50 kilometers.