May the frost be with you!

Choose how you’d like to take part.

In-person

Join us on the CU Campus on Saturday, December 5, 2026 and enjoy all the in-person merrymaking, including our Holiday Finish Fest!

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Each entry includes:

Official COLDERBolder gear

Every entry includes an official COLDERBolder shirt and winter beanie to mark the occasion.

Race selection & availability

Choose your race

The first 13 races group runners of a similar pace, based on a verified race time.

Let's Do This is the official registration partner of COLDERBolder 2026

You are being directed from COLDERBolder 2026. All purchases made on the following pages will be from COLDERBolder 2026's third-party providers and subject to their separate terms and conditions.

Virtual

Run your 5K on your own course anytime from Friday, December 4th – Sunday, December 6th – same race, your road.

Complete your 5K and earn your official COLDERBolder finisher’s medal.

Running with us in Boulder? Celebrate afterwards with burritos, doughnuts, coffee, hot cocoa and more.

If you ran the 2025 COLDERBolder or 2026 BOLDERBoulder, we can use your previous result to place you in the right race. You can also submit a verified time from a 5K or longer completed on or after December 6, 2025.

No qualifying time? Choose the Open Race. There’s no qualifying time required.

Planning to walk? Choose the dedicated Walking Wave.

Is your race sold out?

If the race you qualify for is full, join the waitlist rather than selecting another race.

Your qualifying time will be verified and, if a space becomes available, you’ll be moved into the appropriate race.

If not, your registration will be refunded.

Add what runners should do if their preferred wave has sold out.

May the frost be with you!

Choose how you’d like to take part.

In-person

Each entry includes:

Official COLDERBolder gear

Race selection & availability

Choose your race

Start waves

Is your wave sold out?

Virtual

Finisher’s medal

Holiday Finish Fest

Is your race sold out?