Calling all cold-blooded runners, rebels, and fitness junkies!

The ColderBOLDER 5K is open to everyone. So layer up, grab a hat, and join us. Oh yes you can!

Race, Run, Jog, or Walk

We want you to have the time of your life no matter how fast you are, even while freezing your buns off!

The Course

Wind through the scenic University of Colorado campus, the course finishes inside the toasty Balch Field House.

CB Expo

After you finish, check out the expo for great food and drink samples, and tons of other schwag.

Finish Line Party

The perfect way to end your 5K is running into the Balch Field House to celebrate with friends and family. Watch the Cold Medal Ceremony while you enjoy your free goodies.

The ColderBolder

This 5K is a little different, but so are those of us who enjoy running in the cold. It is actually 13 individual races. The top three men and women in each race win Cold Medals and an ice-cold YETI Rambler. That’s 78 medalists total. 

The First 12 Races

These are for people who participated in the last BolderBOULDER. Each individual race puts people together who are about the same speed. Why? So everyone has a shot at winning. For example, if you finished the BolderBOULDER in 52 minutes you would race against people who finished between 52-54 minutes. It’s your chance at personal glory and eternal fame. You got this. 

The 13th and Final Race 

This is open to everyone, runners, joggers and walkers. We all want to stay fit over the holidays, and we want everyone to be able to participate. So, break out in a cold sweat with us. Let’s pour cold water on those winter blues. 

We’ve Got Your Back

We know how you like to be treated.

No hidden fees!

That’s right.

We’re a little different.
Learn more. 

Can’t make it?

No problem!

No other race offers this. Learn more.

Early Bird Bonus Shirts. First-come, First-served.

We’re giving these away to the first people who sign-up until we run out!

Shirts and sizes are limited.

Register While You Still Can

This race is capped at 3,000. Snow or shine, this will sell out. First-come, first-served.

Hat Package

Check It Out

Start Winter on the Right Foot.

ColderBOLDER 2016 Countdown. Dec. 3, 2016.









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We Couldn’t Do It Without Our Partners


Our Presenting Sponsor. Apex carries nothing but the very best Performance Sunglasses.

Oskar Blues

Official Brewery and Anti-official Recovery Drink of the ColderBOLDER.

Boulder Running Company

Gear up for the cold with our Official Running Company Sponsor.

King Soopers

Our Official Fuel-up Center for Training and Perfect Running Performance.


Officially the Coolest (and Coldest) Cooler Sponsor Ever.