Racing Underground

Racing Underground Racing Underground has been producing and timing endurance sport events in Colorado since 1995. Experience the Racing Underground Difference!!!!

Beautiful weather is on tap for this Sunday's Three Creeks Half Marathon! Bring the whole family along to cheer you on,...
03/31/2026

Beautiful weather is on tap for this Sunday's Three Creeks Half Marathon! Bring the whole family along to cheer you on, and the Easter Bunny will make an appearance with candy for the kids!
www.ThreeCreeksHalf.com

The Chilly Cheeks Duathlon kicks off at 10am at Cherry Creek State Park. Perfect conditions. Race day registration is ...
02/21/2026

The Chilly Cheeks Duathlon kicks off at 10am at Cherry Creek State Park. Perfect conditions. Race day registration is available. www.ChillyCheeksDu.com

Chilly Cheeks Course Conditions:* Bike Course - road is damp but no snow* Run Course - damp bike path. Dusting of snow ...
02/21/2026

Chilly Cheeks Course Conditions:
* Bike Course - road is damp but no snow
* Run Course - damp bike path. Dusting of snow on dirt section
* Transition - damp pavement.
Conditions are fantastic!

02/20/2026

The CHILLY CHEEKS DUATHLON is just a day away!!! There might be some flurries today, but they aren't forecasting much (if anything) in the way of accumulation -- nothing like this snowfall that came in the night before the race a few years back!

You can still register online up until race start time! Tomorrow's forecast calls for a beautiful and sunny winter morning.
www.ChillyCheeksDu.com

Registration is open until race start time on Sunday morning. Please register online at www.RalstonCreekHalf.comEarly p...
02/13/2026

Registration is open until race start time on Sunday morning. Please register online at www.RalstonCreekHalf.com
Early packet pickup takes place today at Runners Roost Lakewood from noon until 6:30pm, with great in-store deals!

DISCOUNT EXPIRES TONIGHT! Save 10% on your entry fee when you register before 11:59pm on Monday using coupon SUNSHINE -...
02/09/2026

DISCOUNT EXPIRES TONIGHT! Save 10% on your entry fee when you register before 11:59pm on Monday using coupon SUNSHINE -- Don't miss out on this beautiful day for a half marathon!!!
www.RalstonCreekHalf.com
Coupon does not apply to already discounted youth 5k pricing.

Colorado's favorite winter run-bike event - The Chilly Cheeks Duathlon! Save 10% with coupon code 'CHILLYCHEEKS' when y...
02/08/2026

Colorado's favorite winter run-bike event - The Chilly Cheeks Duathlon! Save 10% with coupon code 'CHILLYCHEEKS' when you enter by 11:59pm on Tuesday February 10th.
www.ChillyCheeksDu.com

What's not to like! One week to go until the Ralston Creek Half Marathon and 5K. Save 10% on your entry fee when you r...
02/07/2026

What's not to like! One week to go until the Ralston Creek Half Marathon and 5K. Save 10% on your entry fee when you register before 11:59pm on Monday using coupon SUNSHINE -- Coupon does not apply to already discounted youth 5k pricing.
www.RalstonCreekHalf.com

Congratulations to Andrew Sager, winner of the Yeti Chase - SummitCove Lodging $500 summer stay at one of their 300 beau...
01/30/2026

Congratulations to Andrew Sager, winner of the Yeti Chase - SummitCove Lodging $500 summer stay at one of their 300 beautiful properties in Keystone!!! Have fun Andrew!

Registration is open for the 2026 Rumble at the Ranch 6 Hour MTB Relay. Teams or 2, Teams of 3, and Solos are welcome! ...
01/30/2026

Registration is open for the 2026 Rumble at the Ranch 6 Hour MTB Relay. Teams or 2, Teams of 3, and Solos are welcome!

See how many laps of the 7.6 mile course you can complete in 6 hours. Course is 65% flowy and fun single-track and 35% double-track for easy passing. Total elevation gain per lap is 658 feet.

Join us in Highlands Ranch for a super-fun late-August day of playing on bikes!
www.RumbleAtTheRanch.com

DON'T MISS OUT!!! Register for the Three Creeks Half Marathon before February 1st and you will receive a Three Creeks P...
01/12/2026

DON'T MISS OUT!!! Register for the Three Creeks Half Marathon before February 1st and you will receive a Three Creeks Pint Glass with your entry!

Join us on April 5th for Colorado's best spring half marathon. Enjoy the most scenic parts of Cherry Creek State Park as you cover an equal mix of road, paved bike path, and well manicured dirt trails.

We look forward to seeing you cross our finish line!
www.ThreeCreeksHalf.com

Save 10% on your entry fee when you enter using coupon code ROCK26Make this the year you cross America's Highest Road Ra...
01/03/2026

Save 10% on your entry fee when you enter using coupon code ROCK26
Make this the year you cross America's Highest Road Race off your bucket list! Coupon expires at 11:59pm on Monday January 5th.
www.TheBlueSkyAscent.com

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