The 10 toughest Colorado ultra marathons
A Guide to Colorado’s Most Formidable Ultra Challenges
If you’re an ultrarunning enthusiast, Colorado’s breathtaking landscapes and grueling terrain offer some of the most challenging and rewarding ultra races in the world. From iconic 100-mile races to newer, lesser-known events, this guide explores the must-run ultras in Colorado. We've included links to help you learn more and take your first step toward registering for these epic adventures.
Colorado's Most Iconic Ultra Challenges
Hardrock 100 Endurance Run
The Hardrock 100 attracts elite ultrarunners from across the globe. This 100.5-mile course spans 13 major mountain passes, navigating through the rugged San Juan Mountains. With over 33,000 feet of elevation gain and an average altitude of 11,000 feet, this race is not for the faint-hearted. Finishers celebrate their accomplishment by kissing the iconic ‘Hardrock’—a tradition as enduring as the race itself.
Leadville Trail 100 Run
Nicknamed "The Race Across the Sky," the Leadville Trail 100 is legendary for its relentless climbs and altitude challenges. The course includes two punishing ascents over Hope Pass, peaking at 12,620 feet. With its combination of history, community spirit, and challenging terrain, Leadville is a bucket-list race for many ultrarunners.
The Ouray 100
The Ouray 100 is often dubbed one of the toughest ultras on the planet. Located in the San Juan Mountains, this course boasts an astonishing 40,000 feet of elevation gain over 100 miles. With its rugged trails and relentless climbs, this race challenges even the most experienced ultrarunners. The stunning views, however, make every grueling step worthwhile.
The Great Divide Ultra
The Great Divide Ultra offers a combination of beauty and toughness. Runners traverse the scenic meadows and granite outcrops of Mueller State Park, with panoramic mountain views providing a stunning backdrop. This event also includes the Dark Divide Night Run, offering a unique chance to conquer the trails under the stars.
The High Lonesome 100
One of the newer but highly regarded races, the High Lonesome 100 takes runners across the stunning Sawatch Range, which is home to eight of Colorado’s highest peaks. The course highlights include high-alpine trails, sweeping views, and plenty of vertical gain, making it a favorite among ultrarunners seeking a challenging adventure.
Emerging and Unique Ultra Events
The Summit 200
For those craving an extended test of endurance, the Summit 200 delivers a 200-mile loop around the stunning Summit County. This relatively new event pushes physical and mental limits, combining long mileage with breathtaking Colorado vistas.
Front Range Ultra Dayze
Front Range Ultra Dayze in Loveland is more than just a race—it’s a celebration of ultrarunning. This event offers multiple race distances, free camping, and a festival-like atmosphere, making it an ideal choice for those seeking camaraderie and community alongside a great race.
Ol' College Try 24 Hour Ultra
Test your endurance with the Ol' College Try 24 Hour Ultra in Denver. Participants push their limits in a full day of running, where the focus is not on the distance but on discovering how far you can go in 24 hours.
Weld Your Mettle Ultra Marathon
Claimed as Weld County’s first ultra marathon, the Weld Your Mettle Ultra Marathon takes runners along the picturesque Poudre River Trail, which connects Windsor to Greeley. This race combines accessible terrain with scenic views, making it an ideal event for first-time ultrarunners and veterans alike.
24 Hours of Palmer Lake
Set against the serene backdrop of Palmer Lake, the 24 Hours of Palmer Lake is a unique event that challenges participants to run as far as possible within 24 hours. With stunning lake views and a supportive atmosphere, it’s a race that offers both a physical challenge and a memorable experience.
Conclusion
Whether you’re a seasoned ultrarunner or just starting to explore longer distances, Colorado’s ultra races offer something for everyone. From legendary events like the Hardrock 100 and Leadville Trail 100 to emerging challenges like the Summit 200 and Weld Your Mettle Ultra Marathon, there’s no shortage of opportunities to test your limits amidst some of the most stunning scenery in the world.
Start planning your next adventure by exploring the links above, and take the first step toward your next ultra challenge!
For advice on these and all other major Colorado ultra runs, contact ultra marathon coach Maximum Mileage Coaching today for optimised ultra running tips.
