The Bolder Boulder 10K race, which began in 1979, achieved the fourth-highest registration in its history, totaling 53,801 entrants this year. For the first time ever, registrations had to be cut off due to reaching operational capacity. Race director Cliff Bosley noted that the pride in the race's history continues to draw participants. In the wheelchair races, Kendall Gretsch won for the second year in a row, while John Cassidy took the men's title. The event also honored late CU reporter Adam Munsterteiger with special highlights from runners.

By the Numbers
  • 53,801 total entrants for the 2026 Bolder Boulder.
  • This year’s registration is the fourth-largest in race history, trailing only the years 2011, 2008, and 2010.
State of Play
  • Organizers had to close registrations for the first time, indicating a growing popularity.
  • Participants included a team of CU alums, showcasing the event's community ties.
What's Next

With the growing number of participants, future races may continue to face the challenge of operational capacity, prompting discussions about potential changes in the registration process or race format.

Bottom Line

The Bolder Boulder’s success not only reflects its rich tradition but also underscores the need for efficient planning as interest soars, ensuring that the event remains accessible while celebrating its landmark history.