Denver's Colfax Marathon

09/08/2026

This Saturday runners take to the runway at Denver International Airport for only the 2nd time!

The 5K On The Runway is scheduled for Saturday, Sept. 12, when runners will gather at 7 a.m. for a sunrise 5K on a runway at the Denver International Airport.

09/08/2026

Your first race should be exciting - not stressful

A little preparation can go a long way. From tapering and fueling to knowing the course and race-day logistics, avoid these common mistakes and set yourself up for a great race.

And veteran runners, we want to hear from you: What’s the one piece of advice you’d give a first-time racer? 👇

09/07/2026

Would you rather? 👀🏃‍♀️

A marathon is already a challenge… but which would make it harder?
No spectators cheering you on OR no aid stations along the way? 😅

Drop your choice below 👇

09/06/2026

Happy Read a Book Day! 📚🏃‍♀️

Today’s reading list is for the runners:
📖 The Front Runner - Brendan O’Meara
📖 The Rise of the Ultra Runner - Adharanand Finn
📖 Daniels’ Running Formula - Jack Daniels

What running book are you reading right now? 👇

09/05/2026

This International Charity Day, we’re celebrating the incredible impact of the Colfax community.

Each year, the Colfax Marathon partners with 150+ nonprofits, whose runners have collectively raised more than $5 million for causes that matter. Colfax also donates more than $200,000 each year to charities.

Together, we’re proving that every mile can make a difference ☺️

09/05/2026

Get your own personal safari with a mile through Denver Zoo on the Half Marathon course!
https://www.runcolfax.org/races/half-marathon/
The race has sold out the past 4 years and going faster than ever already!

09/04/2026

Run past some of the city’s most iconic sights, including the Capitol, Civic Center Park, Denver Zoo, and Fire Station #1 - then celebrate with a finish line party on the lake. 🏙️🎉

The Colfax Half Marathon is more than a race. It’s 13.1 miles through the heart of Denver.

Ready to make it your next race? 👟🏁
Register for the Denver Colfax Half Marathon at RunColfax.org

09/04/2026

Grab your Relay Team spot now to save 💰and runner names later!
https://www.runcolfax.org/races/marathon-relay/
Choose your favorite leg of Denver's only marathon with a team of 5 and get your medal, lunch, drinks, and more at the finish line!

09/03/2026

Sometimes, having a race on the calendar is all the motivation you need!🏁

Sign up early, set a goal, start training, and give yourself something to look forward to.

Register today at RunColfax.org

09/03/2026

Our ambassadors help bring the Colfax mission to life year-round - connecting with runners, supporting our charity partners, sharing their Colfax journey, and growing the running community 🤩👟

Get to know the team and what they’re all about ⬇️
https://www.runcolfax.org/runner-info/ambassador-program-2027/