All-Out Dog Days

JUL
11
2026
Run along the Big Dry Creek Trail with views of the Colorado Front Range. This event offers 5K, 10K, and Half Marathon distances plus a special dog division and costume contest.
Sat 11 Jul 2026
13 miles 10 kilometers 5 kilometers

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All-Out Dog Days

The All-Out Dog Days is a running event held in Westminster, Colorado, situated between Denver and Boulder. The courses utilize the Big Dry Creek Trail, featuring out-and-back routes that travel northeast. Participants encounter a mix of surfaces, including soft surface sections along the longer distances, while viewing the Front Range and the Flatirons on the horizon.

Available distances include:

  • Half Marathon (13.1 Miles)
  • 10K
  • 5K

The Half Marathon course follows a gentle downhill trajectory to a turnaround point at mile 6.55. This route includes 10 aid station stops and 4 restroom facilities. The 10K participants follow the same trail to a turnaround at mile 3.1, with 4 aid stations and 2 restroom stops available. The 5K route reaches its turnaround at mile 1.55 and provides one aid station with a toilet facility near that point.

This event includes a dog division with awards for the fastest dogs at each distance, as well as a dog-themed costume contest. In addition to the in-person races, virtual options are available for the 5K, 10K, and Half Marathon. Virtual participants receive a distance medal and maintain eligibility for series awards, such as the Run Amok Championship and alumni tags. Visit the organization's website for the most recent information.

13 mi
Half Marathon
10 km
10k
5 km
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