DU Crimson Classic 5K Run/1.5 Mile WalkRunning5k5k5k5kWalking2 km2 km2 km2 km October 22, 2025Denver, Colorado, United States
2025 Louisville Fall Festival Glow 5K Run/WalkRunning5kWalking2 km October 24, 2025Louisville, Colorado, United States
Zia 4CCX Rd 2 StadiumCycling2 km2 km2 km2 km2 km1 km1 km October 25, 2025Durango, Colorado, United States
Brain Aneurysm Foundation 5K - LouisvilleRunning5k October 25, 2025Louisville, Colorado, United States
Halloween Fun Run 5k & 1mile - Zombie ThemeRunning5k2 km October 25, 2025Idaho Springs, Colorado, United States
REAL Spooky MileRunning2 km2 km2 km2 km2 km2 km2 km2 km October 25, 2025Niwot, Colorado, United States
Apex Foundation Trick or Trot 5K & Halloween HuntRunning5k2 km5k October 25, 2025Arvada, Colorado, United States