Get ready for a fantastic mid-season challenge and a sun-soaked adventure at our 15th Annual Dog Days 5K, 10K, and half marathon, proudly benefiting Lifeline Puppy Rescue! Held in a central location convenient to both Denver and Boulder, our courses go along the scenic concrete-paved Big Dry Creek Trail as it winds northeast. You'll enjoy breathtaking views of the Flatirons on the horizon while you run.
This event is perfect for both human and dog athletes! The trail offers a generous amount of soft surface, especially along the 10K and half marathon routes, making it ideal for dogs. We celebrate our canine competitors with a separate dog division for each distance, where the first three finishing dogs will receive a medal, award, and prize. (Just remember to register your dog the morning of the event!) . For extra fun, join our dog-themed costume contest!
After conquering Dog Days, keep the challenge going by participating in the "endless series" counterpart, Fa La La, held in December.
Jul 10, 2027
Distance — 21.1K
Type — Running
07:00
$65.00
Jul 10, 2027
Distance — 10K
Type — Running
07:00
$25.00
Jul 10, 2027
Distance — 5K
Type — Running
07:00
$20.00
Jul 10, 2027
Distance — 21.1K
Type — Running
07:00
$35.00
Jul 10, 2027
Distance — 10K
Type — Running
07:30
$45.00
Jul 10, 2027
Distance — 5K
Type — Running
07:40
$35.00
These values represent the 3-year monthly averages for July in Westminster.
Learn more about the host city, Westminster.
Westminster is a city of about 115,000 in the Denver Metropolitan Area of the western U.S. state of Colorado. The city lies northwest of Denver in Adams and Jefferson counties.
Read more launchTours and activities near Westminster, powered by Viator.
Read what other athletes have to say about their experience at the All-Out Dog Days.
Be the first to share your experience with the community!
Spotted an error or missing detail about the All-Out Dog Days? Help us improve.
Explore other exciting events happening in this same region.
Hand-picked events we think you’ll love.
Oct 05, 2026
Fall 2026 After-School Clubs Offerings Sponsored by the Mott Road HSA
Read more
Oct 05, 2026
Running With Giants: Pumpkins to Paws A Virtual Half Marathon for Great Danes 🎃🐾 Big strides. Big hearts. Big impact. J…
Read more
Oct 05, 2026
A virtual 6k run/walk competition honoring those women who blazed the trail for the next generation of engineers in STE…
Read more
