Boulderthon: Boulder Marathon and Half Marathon 2023 @1420 Pearl St, Boulder, Colorado, United States on 08 October 2023

Colorado’s Largest Fall Race Series: Registration for Boulderthon 2023 is now open! Run a 5k, 10k, Half, or Full, at the foothills of the Rockies, in the stunning running mecca of Boulder. Run the streets Olympians train on, then celebrate at our epic after-party downtown!

Boulderthon is one of the top-rated marathons in the United […]

Pancake Stampede 5K @ The Hudson Gardens and Event Center, Littleton, Colorado, United States on 13 August 2023

The race is a part of Littleton’s Western Welcome Week celebration, and is held before the annual pancake breakfast at Geneva Park. Registration includes awards and entry to the Western Welcome Week Pancake breakfast.

Time: 8:00 AM – 10:00 AM

Miles For Migraine – Denver @ Centennial Park, Englewood, CO, United States on 29 July 2023

Miles for Migraine will host its 4th annual 2-mile Walk (or Intentional Movement of your choice), 5K Run and Relax Denver Event on Saturday July 29th, at Centennial Park. This event is a fundraiser for Migraine & Headache Awareness, Treatment & Research. It’s more than a walk/run – come connect with your local migraine & […]

Slacker Half Marathon-Relay-4-Mile Races @ 405 Argentine Street, Georgetown, CO, United States on 24 June 2023

Do not be misled by the name but this is the Slacker Half Marathon/4M Race – the highest downhill half marathon in the country, beginning at 10,630 feet and traveling over a rolling hill descent to 8400 feet!The half marathon begins at Loveland Ski Area (BASIN), and travels the first mile on dirt roads before […]

Impact Uganda 5K/10K @ 8085 E Harvard Ave, Denver, CO, United States on 19 August 2023

The Fourth Annual Impact Uganda Fun Run, an in-person run in Denver on August 19th at 8am, and a virtual run option for those who can’t make it (or those who don’t want to run in public). Funds raised through this race will go to help raise up the children and families that True Impact […]

Red Feather Trail Jamboree @ 2331 County Rd 68C, Red Feather Lakes, CO, United States on 22 September 2023

Welcome to the Red Feather Trail Jamboree, a three-day trail running weekend put on by trail runners for trail runners. Come enjoy the clean air and wild spaces of the Red Feather Lakes region in Northern Colorado! Take advantage of the opportunity to explore some new trails on the private land of the Ben Delatour […]

Boulderthon: Boulder Marathon and Half Marathon 2023 @ 1420 Pearl St, Boulder, Colorado, United States on 08 October 2023

Run a 5k, 10k, Half, or Full, at the foothills of the Rockies, in the stunning running mecca of Boulder. Run the streets Olympians train on, then celebrate at our epic after-party downtown!

Revel Rockies @ 303-319 CO-8, Morrison, CO, United States on 03 June 2023

This incredibly fast and remarkably beautiful downhill road race takes runners from the forests and canyons of the Rocky Mountains to the foothills of Denver, Colorado. Featuring a perfectly smooth downhill slope and spectacular scenery, this race will be sure to help you set your PR and finally hit that Boston Qualifying time. This event […]

Slacker Races @ Georgetown, CO, United States on 24 June 2023

Do not be misled by the name but this is the Slacker Half Marathon/4M Race – the highest downhill half marathon in the country, beginning at 10,630 feet and traveling over a rolling hill descent to 8400 feet!

The half marathon begins at Loveland Ski Area (BASIN), and travels the first mile on dirt roads […]

Colorado Springs Marathon, Half, 5K, and Kids K @ 215 S Tejon St, Colorado Springs, CO, United States on 30 September 2023

Come celebrate the 10 Year Anniversary of the Colorado Springs Marathon presented by Centura Health on Saturday, September 30, 2023! Whether you are a seasoned runner or looking to tackle your first 5k, we have you covered with 4 events to choose from. Beginning and ending on Vermijo at the Colorado Springs Pioneers Museum, the […]

Crazy Legs 10k Trail Run @ 1725 Hidden Valley Road, Loveland, CO, United States on 04 June 2023

-The race begins at 7:00am and held at Devil’s Backbone Open Space 1725 Hidden Valley Drive in Loveland. Trail conditions can be access through the website https://www.larimer.org/naturalresources/parks/devils-backbone -All runners will be able to select a hat with a random patch on it like I did last year. -I am flying Wednesday afternoon on May 31st […]

24 Hours of Palmer Lake @ 199 County Line Rd, Palmer Lake, CO, United States on 30 September 2023

24 Hours of Palmer Lake is back! This race features 24 hours of a gorgeous 0.82 mile loop course surrounded by mountains on top of the Palmer Divide at an Elevation of 7,240 Feet. This is a low fanfare community-driven event, simply geared towards those who love to push their mental and physical limits while […]

Ned Ned Run @ Teens Inc, Nederland, CO, United States on 09 September 2023

Embark on your journey by winding through Old Town Nederland, the epitome of Colorado mountain towns. The Half Marathon will take you on dirt roads and single track trails as you challenge yourself to be “a little more extreme“ and immerse yourself in the history and beauty of the area. This long-time race is family […]