Boulder Co 2024 Marathon Schedule. On sunday, september 29th, 2024 for the fourth annual boulderthon marathon in stunning boulder, colorado. Find and register for your next full marathon race with our calendar.
On sunday, september 29th, 2024 for the fourth annual boulderthon marathon in stunning boulder, colorado. In 2024, usa today named boulderthon’s 5k the #5th best in the country, while simultaneously announcing its half marathon as the #8th best in the us, in its 2024.
