Top 25 Races in Colorado

The Hardrock 100 is one of America's most legendary 100-mile endurance runs, completing a stunning loop through Colorado's San Juan Mountains from Silverton. With over 100,000 feet of climbing and altitudes exceeding 14,000 feet, this iconic race attracts the most competitive ultrarunning field in the country. A bucket-list event for serious mountain runners seeking the ultimate test of endurance and grit.

The Leadville Trail 100 Run is America's oldest and highest 100-mile ultramarathon, where runners literally race across the sky reaching 12,600 feet at the legendary Hope Pass. This historic 'Race Across the Sky' demands serious endurance and requires qualifying standards for entry, attracting only the most dedicated ultrarunners. Set in Colorado's historic mining town at extreme altitude, it's the ultimate test for mountain runners seeking to conquer one of the world's most legendary 100-milers.

Experience the ultimate mountain running challenge at the Pikes Peak Marathon, where you'll climb from Manitou Springs to the awe-inspiring 14,110-foot summit of Pikes Peak. As one of America's oldest mountain marathons since 1956, this grueling race tests runners with brutal altitude, steep grades, and relentless vertical gain. Not for the faint of heart, this iconic event is reserved for experienced mountain runners ready to conquer one of the most legendary endurance events in the world.

Experience the ultimate test of endurance on the Pikes Peak Ascent—the world's most iconic uphill race. This legendary half marathon climbs 13.3 miles straight up Pikes Peak, ascending from 6,300 feet to the breathtaking 14,110-foot summit. Whether you're an elite mountain runner or a determined amateur, this bucket-list race delivers an unforgettable challenge.

Run through America's running capital with the iconic Flatirons and Colorado mountains as your backdrop during the Boulderthon Marathon. This October race captures the heart of Boulder — a city renowned for its legendary running culture, scenic trails, and fitness-focused community. Whether you're chasing a personal best or soaking in the mountain views, Boulderthon delivers an unforgettable marathon experience through one of America's most scenic cities.

Colorado's original road marathon takes runners on a scenic 26.2-mile journey from Fort Collins to Greeley along the beautiful Poudre River. With a net 300-foot downhill course and ideal May timing, this race is perfect for runners seeking a fast, picturesque marathon or a Boston qualifier. The stunning spring scenery and downhill advantage make this Colorado classic a must-run for any serious marathoner.

Experience Colorado's premier point-to-point mountain run on the Imogene Pass Run 2024, a breathtaking 17.1-mile journey from Telluride to Ouray crossing the stunning 13,114-foot Imogene Pass. This sold-out annual event showcases the raw beauty of the San Juan Mountains while challenging runners with altitude, technical terrain, and unforgettable alpine vistas. Whether you're an experienced mountain runner seeking elevation glory or a trail enthusiast chasing bucket-list adventures, Imogene delivers an iconic Rocky Mountain experience.

This marathon in Leadville, CO, organized by Leadville Race Series, the leadville trail marathon shares the leadville race. It's a solid choice for runners of all levels looking for a marathon in the Leadville, CO area.

Tackle one of America's most challenging marathons from America's highest incorporated city at 9,318 feet! The Silverton Alpine Marathon sweeps runners through the rugged San Juan Mountains on technical alpine trails in August, offering breathtaking high-altitude scenery and serious altitude training for experienced runners seeking a bucket-list mountain race.

This marathon in Steamboat Springs, CO combines competitive racing with scenic views, featuring point-to-point through routt county national forest outside steamboat springs — beautiful mountain marathon with yampa river valley views. It's a solid choice for runners of all levels looking for a marathon in the Steamboat Springs, CO area.

Run the Breckenridge Road Marathon through Colorado's historic gold-mining streets at 9,600 feet of elevation. This summer mountain marathon combines the challenge of high-altitude running with breathtaking views of the Rocky Mountains in a world-famous resort town. Perfect for experienced marathoners seeking an unforgettable scenic challenge.

The Rim Rock Marathon takes runners through the breathtaking Colorado National Monument, where towering red rock formations and sweeping canyon vistas create an unforgettable racing experience. This October event combines challenging rimrock terrain with the warm glow of fall colors, making it perfect for experienced marathoners seeking scenic beauty and a true test of endurance. The dramatic canyon country and panoramic rim views transform every mile into a visual masterpiece.

The Colfax Marathon traces the length of America's longest commercial street, running from Aurora to Denver along the iconic Colfax Avenue. Runners experience Denver's most famous landmarks, scenic parks, and beautiful lakes during this unique May race. Perfect for runners seeking an unforgettable urban marathon that showcases the Mile High City from end to end.

The Aspen Valley Marathon takes runners through the breathtaking Roaring Fork Valley with iconic views of the Maroon Bells—one of Colorado's most photographed peaks. This small-field race offers an intimate, world-class mountain running experience through the heart of Aspen's stunning alpine landscape. Perfect for runners seeking uncrowded trails and jaw-dropping scenery, this race showcases the best of Colorado's mountain beauty.

Run through time and wildflowers on this unforgettable Colorado marathon through Crested Butte, the state's wildflower capital. Every July, historic mining town trails transform into a breathtaking canvas of columbine and alpine blooms, creating a bucket-list running experience for those who want their marathon to be as scenic as it is challenging. This is mountain racing at its most beautiful, where every mile feels like running through a postcard.

The Mt. Sneffels Marathon delivers an unforgettable technical mountain running experience beneath the awe-inspiring shadow of Colorado's iconic 14,150-foot Mt. Sneffels. This challenging high-country marathon showcases Telluride's most dramatic alpine scenery across rugged terrain that rewards experienced mountain runners with views most people never see. Whether you're chasing altitude PRs or seeking the ultimate Colorado bucket-list race, the Mt. Sneffels Marathon offers a truly legendary high-mountain challenge.

Run the Durango Marathon through Colorado's stunning Animas River Valley, where golden aspens paint the historic railroad town in brilliant fall colors. This October marathon combines high desert trails with mountain terrain for an unforgettable Rocky Mountain experience that draws runners seeking scenic beauty and challenge.

Experience the ultimate Colorado mountain marathon without the long drive. The Staunton Rocks! Marathon winds through Staunton State Park's stunning forest trails and granite rock formations, offering runners spectacular Rocky Mountain scenery just minutes from Denver. This trail marathon is perfect for runners seeking challenging terrain with breathtaking views.

The Blue Sky Trail Marathon winds through Fort Collins' most breathtaking landscapes, where runners traverse single-track paths through rolling prairie, dense forest, and along the scenic foothills. As Fort Collins' premier trail marathon, this race offers 800 runners an unforgettable journey through Colorado's natural beauty. Whether you're a seasoned trail runner or seeking your first marathon, the Blue Sky Trail's stunning terrain and welcoming atmosphere create an experience unlike any other.

The Telluride Mountain Run takes runners on an unforgettable 24-mile journey through one of America's most spectacular mountain landscapes. This August event traverses high country singletrack surrounding the famous historic mining town, offering breathtaking alpine scenery and a true test of endurance at elevation. Perfect for experienced trail runners ready to conquer Colorado's legendary mountain terrain.

Test your limits on the historic Silver Rush mining trail at over 10,000 feet of elevation. This 50-mile endurance challenge through Colorado's legendary Leadville Race Series pushes runners to their absolute max as you climb to nearly 12,000 feet at the midway point. If you're seeking a true high-altitude test of physical and mental fortitude, this rugged mountain race delivers an unforgettably brutal experience.

Conquer Pikes Peak's legendary slopes at ultra distance with the Pikes Peak Ultra, offering 20K, 50K, and 100-mile options around the iconic Pikes Peak Massif. This August event delivers extraordinary alpine scenery and extreme mountain running challenge for experienced ultrarunners seeking the ultimate Colorado endurance test. With options ranging from challenging 20K to grueling 100 miles, this race is built for athletes who want to push their limits in one of America's most storied mountain running destinations.

Test your limits on the technical Front Range trails surrounding Horsetooth Reservoir in this iconic September trail race. The Quad Rock 50 Mile combines punishing climbs with breathtaking panoramic ridgelines, offering true Colorado mountain running through rugged terrain. With 450 runners across both distance options, this endurance test has become a bucket-list event for serious trail runners seeking authentic Rocky Mountain challenges.

The Never Summer 100K threads the Continental Divide near Grand Lake, Colorado, delivering an untamed mountain ultra experience through alpine lakes, high tundra, and rugged technical terrain. With only ~625 runners on course, this intimate field tackles one of Colorado's most remote high-altitude environments—a true test for those seeking wilderness solitude and epic alpine beauty.

Run through the extraordinary landscape of Mesa Verde National Park on this unique 12-hour timed event, where ancient Ancestral Puebloan cliff dwellings stand as silent witnesses to your endurance journey. Challenge yourself on high desert mesa terrain as you test how far you can go in 12 hours in one of America's most culturally and naturally significant landscapes. Perfect for ultra runners seeking a one-of-a-kind running experience that combines historical wonder with serious endurance testing.