All-Out Dog Days
About this race
Get ready for a sun-soaked adventure and a fantastic mid-season challenge with our 13th Annual Dog Days 5K, 10K & Half Marathon, benefiting Do Over Dogs! Held in a central location between Denver and Boulder, our courses wind northeast along the scenic Big Dry Creek Trail. As you run, you’ll enjoy breathtaking views of the Flatirons on the horizon. Our trail is perfect for dogs, featuring a generous amount of soft surface along the 10K and half marathon routes. Plus, we have a special dog division to award the fastest pups at each distance and a dog-themed costume contest for extra fun! And continue the challenge by participating in the endless series counterpart, Fa La La, in December.
Pick your distance
Running
Half Marathon
Half marathon athletes will join up with Big Dry Creek Trail and go along the gentle downhill course to the turnaround at mile 6.55, then return, enjoying views of the Front Range on this out-and-back course. There are 10 aid station stops for refueling along the route, along with 4 restroom stops.
10K
10K athletes will join up with Big Dry Creek Trail and go along the gentle downhill course to the turnaround at mile 3.1, then return, enjoying views of the Front Range on this out-and-back course. There are 4 aid station stops for refueling along the route, along with 2 restroom stops.
5K
5K athletes will join up with Big Dry Creek Trail and go along the gentle downhill course to the turnaround at mile 1.55, then return, enjoying views of the Front Range on this out-and-back course. There is 1 aid station/toilet stop near the turnaround.
VIRTUAL Half Marathon
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
VIRTUAL 10K
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
VIRTUAL 5K
Participate virtually! Get all of the SWAG, including a distance medal, shipped to you the week after the event, maintain eligibility for series finisher award and alumni brag tags, and get distance credit towards the Run Amok Championship!
Typical race-day weather
Based on 14 years of historical conditions on this event's race dates in Westminster.
About Westminster
All-Out Dog Days takes place in Westminster, Colorado, United States. The local timezone is America/Denver.
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🏃 Plan Your Next Race in Westminster
Find upcoming events by distance:
- Westminster 5K Races Best Westminster routes for beginners and speed work.
- 10K Run Events in Westminster The most popular local distance in Colorado.
- Westminster Half Marathons Top-rated 21.1K courses in the Westminster area.
- Westminster Running Calendar 2026 See all upcoming race dates.
Race information has been sourced from the event's official website and other publicly available resources. For the most up-to-date details, please refer to the official website directly. If you notice any incorrect or missing information, don't hesitate to reach out to us by email.
Other races in the area
All-Out Fall Fest
All-Out Fa La La
