Dog-gone fun for humans and dogs!
All-Out Dog Days
Saturday, July 12, 2025 7:00a
Big Dry Creek Trail, Westminster, CO
Half Marathon
166 spots left. Price increases after June 28, 2025 at 11:59pm MDT
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
Location
Now featuring Exact Fuel
We're excited to now feature Exact Fuel as the electrolyte drink at our aid stations! Exact Fuel is a clean, science-backed electrolyte mix for athletes who want to hydrate smarter. Unlike most drinks filled with sugar and fillers, our scoop-based powder lets you adjust your serving to match your workout and taste. With less waste and more value, you’re in control of how you fuel. We offer a free mobile app that syncs with Strava and calculates the precise ratios of electrolytes based on what you lose in sweat, providing personalized hydration guidance for every session. As a local brand from Lakewood, Colorado, we’re committed to clean ingredients and sustainable practices. No more guesswork just the right fueling, every time.
Visit their website to learn more and to get their app.

An official BOLDERBoulder qualifying event!
We are thrilled to announce that Summer Breeze has been designated as an official BOLDERBoulder Qualifier event! You can use your finishing time from any distance of this race to qualify for one of the 2026 BOLDERBoulder's qualified waves. For more details on the BB10K qualifying waves, please visit this link.

Lifeline Puppy Rescue is a true and 100 percent no-kill shelter. They keep every puppy until they find a home and their vision is to create a world where every puppy has the safety of home and every family has the love of a puppy. Lifeline rescues puppies and mom dogs from 5 states in the Rocky Mountain Region, from a network of 33 shelters and rescue groups, particularly in small towns and rural areas, to prevent euthanasia and has saved over 55,000 lives. Your donation will go a long way to saving these puppies!