Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA is run in Centennial, Colorado, on October 31, 2026. The half marathon (13.1 miles), the 10K, the 5K and a family one-mile fun run all go off at 7:30 a.m.

Racing at Front Range altitude asks for a slightly conservative first mile, whichever distance you have entered, because the effort that feels normal at sea level will cost you more here. Locals will already be adapted; if you are visiting, treat your goal time as flexible and race by feel. The half marathon rewards a twelve-week build with a weekly long run, the 10K and 5K fit inside ordinary training, and the family mile is a short, low-pressure way to bring children to the start line on Halloween morning.