Denver Colfax Marathon

20th year May 16-17 2026! The Colfax Marathon: 2 days, 8 races. Including Denver’s only Marathon & Half Marathon through Denver Zoo. #RunColfax

[Denver Colfax Marathon @runcolfax]

🎉 Registration is opening this month for the 20th year of Colfax 🎉

If you want to find out and get a 24 hour early start, get your name on the early notify list:
https://t.co/NfRkJVVNLj
The first 500 that register get the best price of the season!

#RunColfax #Marathon #HalfMarathon #10Mile #MarathonRelay #RunnerDeal

[Denver Colfax Marathon @runcolfax]

Who is getting in some weekend miles?

#WeekendRun #RunningLife #RunnerTraining

[Denver Colfax Marathon @runcolfax]

Good weather, good company, good run - smiles all around for the weekend ☀️

#runcolfax #denverunning #summerrunning

[Denver Colfax Marathon @runcolfax]

🎉 It's #InternationalFriendshipDay so post a pic of your friends you run with!

#RunColfax #Marathon #HalfMarathon #Runner #Running #FriendDay #InternationalFriendDay

[Denver Colfax Marathon @runcolfax]

Running is a relatively inexpensive sport...

...until you add up the shoes, race registrations, gels, watches, recovery gear, coffee stops, and the "just one more" purchase 😅

What's your biggest running splurge?

#runcolfax #runnerhumor #runnerlife

[Denver Colfax Marathon @runcolfax]

🎉 Registration is opening in a few weeks 🎉

If you want to find out and get a 24 hour head start, get your name on the early notify list:
https://t.co/YAwqiQqaZY
The first 500 that register get the best price of the season!

#RunColfax #Marathon #HalfMarathon #MarathonRelay #10Miler #5Krun #ColfaxMarathon

[Denver Colfax Marathon @runcolfax]

If your summer needs a little more mountain air… start here ⛰️

These are some of the best Colorado trails to explore right now: Apex Park, Deer Creek Canyon Park, Lair O the Bear, Golden Gate Canyon Park, and Mount Falcon.

Which one are you hitting first?

#runcolfax #runningtrails #coloradorunning trails

[Denver Colfax Marathon @runcolfax]

Applications for the 2027 Ambassador Team are now being accepted!
👉 https://t.co/53srvp7B2f

We’re asking all hopeful Ambassadors to submit a 1-minute video telling us a bit about yourself & why you’d be a great fit for the team. No fancy editing needed - be you!
Deadline is August 5th!

#ColfaxMarathon #RunColfax #Ambassador #BrandAmbassador #RunningCommunity #Marathon #HalfMarathon #MarathonRelay #10Miler #5Krun

[Denver Colfax Marathon @runcolfax]

You don’t realize how much a sign can mean… until you’re deep in the miles and it makes you laugh, smile, or keep going 🏃‍♂️💫 Here’s your reminder that you’re stronger than you think!

#runningmotivation #runnerlife #runcolfax

[Denver Colfax Marathon @runcolfax]

For nearly 20 years, our race has been bringing runners together from all over the country.

From first-time 5K participants to marathon veterans and relay teams, every runner has helped shape the story of race weekend.

Swipe through to see how it all started and why so many runners keep coming back year after year!

What's your favorite Colfax memory? 💬

#runcolfax #denverrunning #denvercolfaxmarathon

[Denver Colfax Marathon @runcolfax]

✈️‼️ 5K on the Runway is SOLD OUT ‼️✈️

That was record fast! Thank you, runners, for signing up. This is going to be a one-of-a-kind race experience, and we can't wait to welcome you to the runway on September 12th!

See you on the tarmac 👋

#5kontherunwway #denverairport #denverrunningraces

[Denver Colfax Marathon @runcolfax]

After a 4-year hiatus, the 5K on the Runway is BACK! ✈️🏃

On September 12, runners will race on an actual runway at Denver International Airport, one of the world's busiest airports, while a runway is temporarily closed just for the event.

Last time it sold out in just one day, so don't wait to register ‼️
https://t.co/yOydrh7pZm

Registration includes:
🏅 Finisher medal
👕 Airplane-themed race shirt
🕶️ Aviators (register by July 21)
🍳 Hot breakfast
🎧 Pre- and post-race DJ party

Ready for takeoff? Register at https://t.co/lQ6v2Jqa7H.

#5KOnTheRunway #RunColfax #DENAirport

[Denver Colfax Marathon @runcolfax]

Fall races don’t just happen, they’re built 🍂 Your 2026 Fall Race prep checklist:

🍂 Stay consistent with training
🍂 Practice fueling strategies
🍂 Build strength + prevent injuries

What part of race prep challenges you most? 👇

#2026FallRaces #DenverRunning #DistanceRunning

[Denver Colfax Marathon @runcolfax]

Hot weather running hits different ☀️ Here are a few reminders to help you stay strong, safe, and consistent all summer:

💧 Hydrate + add electrolytes for longer runs
👟 Wear breathable gear + protect your skin
🐢 Slow your pace and run by effort

#SummerRunningTips

[Denver Colfax Marathon @runcolfax]

Shoutout to all the Denver runners out there putting in those hot summer miles right now. The sun is blazing, the pavement is warm, and the alarm clocks are probably too early - but you’re still showing up!

#runcolfax #summertraining #distancetraining

[Denver Colfax Marathon @runcolfax]

Who else looks forward to reading the signs along the course? 🙋‍♀️

The creativity, the jokes, the unexpected laughs... they're all part of what makes race day so memorable.

💬 What's the funniest sign you've ever seen during a race?

#runcolfax #denvercolfaxraces #coloradorunning

[Denver Colfax Marathon @runcolfax]

Lets see your selfies from your running adventures this week!

#RunColfax #Running #Marathon #HalfMarathon #Denver #Colorado #Selfies

[Denver Colfax Marathon @runcolfax]

The Denver Colfax Marathon is more than a race - it's a tour through the heart of Denver. 🎨 From colorful murals & public art to iconic landmarks, every mile showcases the city's creativity. What's your favorite spot along the course?

#DenverColfaxMarathon #RunColfax #DenverArt

[Denver Colfax Marathon @runcolfax]

Marathon training has a way of keeping you humble 😅

You expect every run to feel great... then reality shows up: early alarms, bad weather, and long runs that don't always go as planned. But that's all a part of the journey 💪

#MarathonTraining #RunColfax #RunningJourney

[Denver Colfax Marathon @runcolfax]

Every starting line has them 👀

The runner chatting with everyone. The one locked into race mode. And the one doing pace math until the last second 😂

Which one sounds most like you?

#runcolfax #runnerhumor #runnertypes