East End Mile

Oddfellows Hall 1543 Pearl St., Boulder, CO, United States

Join us on Thursday July 13th, for the Downtown Boulder East End Mile. Our multi-lapped 1-Mile course starts and finishes on Pearl and 16th St., and goes up to 20th St. and back. There will be a Kids 800m, 1-Mile wave for those that run or walk slower than 7-min mile pace, 1-Mile wave for […]

Canceled Storm The Castle Half Marathon

Lorrayne Rance 10591 County Rd 102, Guffey, CO, United States

Human Trafficking is a serious problem across the world and here in the United States. We can help right here, right now. It has become common knowledge that women are trafficked on a regular basis, but sadly, not many realize that young boys are also trafficked but have far less help, allies, and resources. 100% […]

Canceled Black Hawk Trail Half Marathon and 10K

Golden Gate Canyon State Park Crawford Gulch Rd, Black Hawk, CO, United States

If you are looking for one of the best "hill" courses the ERS has to offer, than look no further! You can bet this course will keep your HR high, while you take in the surrounding mountain views and terrain.  The Black Hawk Trail Half Marathon and 10K is not for the faint of heart, […]

Summer Six Pack Series #6 – 5K/10K

Westbrook Park 9650 W 97th Ave., Westminster, CO, United States

Run/Walk 1 mile at the first event through 6 miles at the final event in the series! We will be cheering for you the whole way. If you are a seasoned runner, this series is perfect for testing your limits, getting faster, and stronger with each race. Run a 5k at each event if that […]

Canceled Tracy Vsetecka Memorial 5K

Widefield Parks and Recreation 705 Aspen Dr, Colorado Springs, CO, United States

The annual Tracy Vsetecka Memorial 5K is hosted by Widefield Parks and Recreation. The event is to honor the memory of Tracy who was a longtime teacher and administrator for Widefield School District 3 and to raise funds for the Tracy Vsetecka Scholarship Fund. The scholarship is awarded to a Widefield School District 3 graduate […]

Rocky Mountain Trail Camp

Freight Leadville 201 West 8th Street, Leadville, CO, United States

The Rocky Mountains are a magical and breathtaking place. From our basecamp in Leadville we will soak in views of nearby towering 14,000 foot peaks as we explore a variety of challenging trails during the beautiful mountain summer in Colorado. The crew from Becoming Ultra and your expert coaches will host special clinics and accommodate […]

$500 – $1950

Washington County Cattlewomen 5K

Washington County Event Center 552 W 2nd Ave, Akron, CO, United States

Annual Washington County Cattlewomen 5k Poker Run Come join us for this fun twist on a 5K run! A 5K POKER RUN! Collect a playing card at all 5 check points to build the best 5 card stud poker hand. Runner with the best hand will receive a prize! This year's county fair theme is […]

St. Ignatius 5K

Piinu Nuuchi Skate Park 591 Ute. Rd, Ignacio, CO, United States

In coordination of the St. Ignatius Fiestas, the Ignacio High School Cross Country Team will be hosting a 5K fundraiser to support our XC season. All proceeds will be applied to our teams travel, meals, training gear and next years 5k event.

Living Journeys Half Marathon

Crested Butte Mountain Resort 12 Snowmass Rd, Crested Butte, CO, United States

Hikers and runners are all invited to join us for the Annual Summit Hike, Half Marathon, and the NEW 10k Trail Run on Saturday, July 29th at Crested Butte Mountain Resort Base Area. We're thrilled to be back at Crested Butte Mountain Resort and we're adding a new, mellower trail run option! This is always […]

Pancakes for PDCD 5K/10K

deKoevend Park 6315 S. University Blvd., Centennial, CO, United States

Annual Pancakes for PDCD 5K/10K to raise money to fund research into Pyruvate Dehydrogenase Complex Deficiency (PDCD), a rare mitochondrial metabolic disorder.  100% of the profits are donated directly to Rainbow Babies Children's Hospital in Cleveland, OH; currently, the only hospital conducting research specifically into PDCD. This event is hosted by The Elizabeth Watt PDCD […]

Please click here to submit your event for FREE to our online calendar.
We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.