Boulderthon Marathon & Half Marathon

Located in northwestern Colorado just 30 miles from downtown Denver, the Boulderthon Marathon and Half Marathon is part of Colorado’s largest Fall race series and is dubbed one of the top-rated marathons in the United States. Destination Race, Large Crowds. Voted the #1 Most Beautiful marathon and half marathon in Colorado, and among the most beautiful in the world, Boulderthon brings in over 10,000 participants annually from 50 states and 18 countries. Tucked away in the foothills and Valleys of the Rockies, Boulderthon is a destination race for a reason. With awe-inspiring backdrops of the mountains and beautiful trails throughout, the landscape alone makes it worth running. Not to mention, Boulder is often named the Happiest Place in the United States, so when you’ve completed the race and ran through Downtown Boulder, be sure to celebrate and enjoy the joy of the state! Boulderthon was ranked among the top 10 races in the country by USA Today.