Held on the Autumnal Equinox during the height of fall color, the Equinox Marathon, Half Marathon and 5-miles races are all point-to-point, net downhill, scenic courses along the Cache La Poudre River in Fort Collins. This year, the event will take place on September 18th.

Join us for a great day of running through the spectacular fall colors in the heart of the Elk Mountain Range. Run, walk, or hike the 25k loop around Lead King Basin. Zip past the famous Crystal Mill and the Town of Crystal. After the event enjoy a delicious homemade boxed lunch including Slow Groovin' BBQ […]

THE SUMMARY Did you know that the loop around Sloan's Lake in Denver Colorado is almost perfectly 2.62 miles around? Join us as we go around the lake every hour on the hour for 10 hours to complete a full Marathon or every other hour for 10 hours to complete a Half Marathon (if you decide to […]

Do you support life at all stages from conception until natural death? Do you believe every human being should be treated with the utmost dignity and the respect they deserve? Do you want to see a Culture of Life spread in our country and our world? Then this is the race for you. The Sisters […]

The Pony Express is a 16 mile trail run around Rampart Reservoir. Come out and enjoy the single track, running creeks, wildlife, and Colorado's autumn glory.

Join us for the annual Spooky Sprint 5k/10k & Half Marathon! A fun, Halloween-themed event that is perfect for the whole family.

Join us at Palmer Lake Regional Recreation Area for the Annual Colorado Run for the Fallen—a 6-hour untimed run/walk/ruck hosted by the Honor and Remember – Colorado Chapter. This moving tribute honors over 450 Colorado military service members who made the ultimate sacrifice since the start of the Global War on Terror. Event Overview: This […]

The 9/11 Heroes Run is a 5k race honoring our heroes: those lost on September 11th and in the wars since, as well as the veterans, active duty, first responders, inspired civilians and families of the fallen that support them. This race benefits the Travis Manion Foundation which empowers veterans and families of fallen heroes […]

El Grito 5K (3.1 mile run & walk) on the Auraria Campus, start and finish at the Jordan Student Success Building including, a kids fun run and post race fiesta. Entry includes signature Tarahumara tshirt, race bib, burrito & beverage (beer for 21+). Race proceeds will benefit students who have participated in cross country/track and […]

Join us for The Cabin Creek Fall 5k on September 14, 2025, for a 5k-ish, fun run event that starts and ends at this awesome taproom in Georgetown. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft brew at the finish line. Start windows will be […]

The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against others in-person on Wednesday evenings, or run the marked course on their own Tuesday-Thursday weekly for a virtual option.

Come join the Vail Recreation District for the 3rd Annual Mighty Marmot Kids Trail Race Series! Youths ages 4 to 10 are welcome to participate. Chose between 1 or 2 miles* to compete amongst your friends and celebrate with awards and ice cream after you finish! *4-year-olds can only race in the 1 mile category This series includes […]

The Pikes Peak Marathon, founded in 1956, is the oldest continually held marathon in the United States, taking runners from Manitou Springs, Colorado, to the summit of Pikes Peak at 14,115 feet, and back down for a total of 26.2 grueling mountain miles. It and its sister race, the Pikes Peak Ascent, each climb about […]

A beloved community tradition, the Superhero Run invites runners, walkers, and families of all ages to suit up in their favorite superhero costumes and race for a cause. With a 5K, 10K, 1-Mile and a free Kids Fun Run, there’s a race for everyone whether you’re a seasoned runner or just looking for a fun way […]

The Run the Rockies Road 10k and Half Marathon will feature the traditional Run the Rockies Road Race course with runners starting near Copper Mountain; runners will follow the paved recreation path through the Ten Mile Canyon. The 10k course is 100% downhill and the half marathon course is 75% downhill. This course will showcase […]

Take a step back in time and run or hike where the settlers of the west once walked! These trail races are hosted by the historic Eaton's Ranch, the country's oldest operating dude ranch located at the base of the Bighorn Mountains outside Sheridan, WY. Test your Wyoming grit on September 17th.

The Beulah Challenge, which started in 1996, is a 5K, 10K, and half-marathon run near Beulah, a small southern Colorado community located in the spectacular Beulah Valley nestled in the Wet Mountains. Start and finish for all races is at the school, 8734 School House Ln, Beulah, CO 81023. The 5K and 10K courses take you around […]

Brilliant colors will be flying at Pagosa Springs' iconic ColorFest Color Run 5k. As participants venture out on the course, vibrantly hued hot air balloons will be filling the skies along the entire course route from the annual ColorFest Weekend. ColorFest Color Run 5k participants will be transformed into a running rainbow as you run […]

Join us for the D4.9k Run/Walk, a family-friendly event open to D49 staff, students, parents, and community members! Our mission is to offer an engaging, affordable, and healthy event for everyone in our community. The event kicks off at 8:30am, with the D4.9K Run/Walk starting at 9am. Bring your little ones for the free 49-yard […]

The race benefits THE United States Marine Corps Memorial dedicated "to all Marines for all time" to "Honor Marines and remember all who serve". Lives are changed when veterans visit the Memorial - learn more on the web site at Https://USMC Memorial Foundation.org. Funds help maintain what we have until funds can be raised to remodel the […]

Join us for the Pat Mahan Memorial 5K in Wiggins, Colorado, a family-friendly event celebrating the life and legacy of Pat Mahan.  Lace up your running shoes and hit the course with us as we raise funds to support local students through the Pat Mahan Memorial Foundation, which provides scholarships to graduating seniors at Wiggins […]

Event Description: St. Jude Walk/Run is a family friendly 5K event, taking place at Dick’s Sporting Goods Park on September 23rd. Participants come together during Childhood Cancer Awareness Month to help support the lifesaving mission of St. Jude: Finding cures. Saving children®. Other details: Registration is free and participants are encouraged to share their fundraising page […]

The Move Forward 5K/10K is an event created by the Doctor of Physical Therapy students at Regis University as a community outreach project. The proceeds from the event will benefit Canine Companions for Independence and the Foundation for Physical Therapy.

Have you ever stood at the bottom of a mountain, staring up at the top, thinking to yourself: “I wonder if I could run all the way up there?” Well, now you’re going to find out! The Mountain Marmot Trail Run is an epic trail race. The course is simple — start at the bottom […]

Join us in Sterling Ranch for the Miles 4 Madison 5k/1k fun run. Miles 4 Madison is a 5K/1K fun run sponsored by Sterling Ranch Cab. Miles 4 Madison’s goal is to provide educational and recreational opportunities for families with children with special needs. The race is for all capabilities, strollers, and pet friendly! The […]

Join us for the Montbello Alive 5K, a vibrant community event that brings together runners, walkers, and families for a day of fun, wellness, and celebration. This race is part of the Montbello Alive! celebration, an annual event for our thriving community's culture, spirit, and togetherness. Whether you're an experienced runner aiming for a personal […]

The Autumn Run is held each year on the third weekend in September, in and around the historic, friendly, and picturesque town of Buena Vista, Colorado. Nestled in the upper Arkansas River Valley at the base of the Collegiate Peaks, the Autumn Run has one of the most beautiful courses in Colorado.

Join us for The Rock Cut Estes Park 5k on September 20, 2025, for a 5k-ish, fun run event that starts and ends at this awesome taproom in Estes Park. Run, walk, jog - whatever goes! Complete the course and celebrate with us and a FREE, local craft brew at the finish line. Start windows […]