All-Out Dog Days

JUL

11

2026

Dog Days in Westminster offers 5K, 10K and half marathon courses plus virtual options along Big Dry Creek. Support Lifeline Puppy Rescue, meet adoptable pups, join the costume contest and chase a 2027 BOLDERBoulder 10K qualifier.

Sat 11 Jul 2026

Westminster, Colorado

Registration

Half Marathon 10 kilometers 5 kilometers

Always double-check with the organizer's website! This page may contain affiliate links.

All-Out Dog Days : event overview

All-Out Dog Days is scheduled for July 11, 2026, in Westminster, Colorado. The event offers multiple distance options, including virtual choices. It is the 14th annual running of Dog Days and is described as being in a central location convenient to both Denver and Boulder. The event benefits Lifeline Puppy Rescue; attendees can meet some of the rescue puppies at the venue. Dog-themed activities include a costume contest and a separate dog division for each distance, with the first three finishing dogs in each division receiving a medal, award, and prize. Owners are asked to register their dog on the morning of the event.

Course, distances, and qualifying status

The courses run along the Big Dry Creek Trail and wind northeast. The route provides views of the Flatirons on the horizon. The trail includes a generous amount of soft surface, especially along the 10K and half marathon routes. Finishing times from any distance may be used to qualify for the 2027 BOLDERBoulder 10K waves. Visit the organization's website for the most recent information.