Monsterdash - Denver

OCT
23
2027
Halloween-themed running and family festival at Sloan's Lake Park on October 24, 2026, featuring 5k, 10k, a Kids Mile, expo and costume contest.
Sat 23 Oct 2027
10 kilometers 5 kilometers

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About the race

MonsterDash Denver takes place at Sloan's Lake Park on October 24, 2026. The event includes road race distances and a family-oriented festival in the finish area.

Distances:

  • 5k one loop
  • 10k two loops
  • Kids Mile for ages 3 to 12, parents may run with children

The 10k course has three water stops at about 1.5 miles, 3.1 miles and 4.5 miles and is led out with a cyclist. The start and finish are located at Sloan's Lake Park. Organizers describe the course as fast and flat, with mountain views and trees showing fall colors. Field size is limited to 600 runners.

Race-day amenities and festival features include a sports expo, packet and chip pickup at Sloan's Lake Park South, 12 local vendors, a coffee truck with snacks, BBQ and sponsor drinks, and themed music. The finish area operates as a MonsterDash Carnival with large inflatables such as clowns, an astronaut and an alien, a selfie wall, popcorn, cotton candy and carnival games with prizes.

Awards are presented for the 5k and 10k with results three deep in age groups. The event also includes a costume contest with categories and prizes, and roughly 60% of participants typically wear costumes. Visit the organization's website for the most recent information.

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