Event details subject to change. Please confirm all information via event website.
Week of Events
Desert RATS Trail Running Festival
Desert RATS Trail Running Festival
Desert Rats Trail Running Festival by UTMB has four unique distances, three days of racing and indescribable views of the desert. There is something for every runner. Enjoy views of the Colorado River as you race through flowy singletrack, climb up the mesa, and take in the vastness of the desert.
NoCo Urban Ultra & Relay
NoCo Urban Ultra & Relay
A collaboration event between run.Windsor and Breakaway Athletic Events celebrating the Poudre River Trail. This long-distance race takes you on a sprawling tour of Northern Colorado via the picturesque Poudre River Trail. You'll enjoy scenic views and local amenities through Fort Collins, Timnath, Windsor and Greeley. While ultra distances can be daunting, this race is an ideal option for […]
Sunday, April 12, 2026
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Featured April 12, 2026 -Featured Platte River Half Marathon
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April 12, 2026 -Spring Fling Prairie Dog Half
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April 12, 2026 -Elevate Kids 5K/10K
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Featured April 12, 2026 -Featured Donut Dash
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April 12, 2026RMRR City Park 4M
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April 12, 2026 -Boulder Track Series #1
Platte River Half Marathon
Denver's oldest half marathon runs along the Platte River Trail, covering parts of Littleton and Denver.
Spring Fling Prairie Dog Half
Welcome to the SPRING FLING Prairie Dog Half, part of the Prairie Dog Half Race Series. This spring-time event also features 10k & 5k distances!
Elevate Kids 5K/10K
Our mission is to help elevate kids' lives by using unique fundraising efforts to raise awareness for and donate the funds to non-profits that help kids. We do what we do with Elevate Kids because we have a big warm spot in our hearts for Kids Aid. They provide a service to help kids in […]
Donut Dash
The Donut Dash 5K is Denver’s race that ends with doughnuts. Runners and walkers can take advantage of a flat and fast course, and then enjoy fresh doughnuts at the finish. Our mission is to bring people together to have a fun, fit morning.
RMRR City Park 4M
Everyone – slow, fast, or in-between – can win at RMRR Trophy Series races. With our handicap scoring system, we predict YOUR finish time based on recent running results, giving you a great goal to shoot for whatever your speed. Just show up an hour before the start and we’ll get you ready for your race. It’s an […]
Boulder Track Series #1
We are pleased to offer 2 x Spring track meets (4/12 & 5/3), for middle distance and distance runners, that will be conducted similarly to the BMC (British Milers Club) meets. All meets will be held at Niwot High School (8989 Niwot Rd, Niwot, CO 80503). ADDITIONAL NOTES There are NO age restrictions for the […]
Monday, April 13, 2026
No events on this day.
Tuesday, April 14, 2026
No events on this day.
Wednesday, April 15, 2026
No events on this day.
Thursday, April 16, 2026
No events on this day.
Friday, April 17, 2026
No events on this day.
Saturday, April 18, 2026
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April 18, 2026 -Rattler Trail Race
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April 18, 2026 -All-Out Beat the Heat
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April 18, 2026 -Polar Plunge 5K
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April 18, 2026 -Do Not Stop Half Marathon
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April 18, 2026 -Great Western Trail Race
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April 18, 2026 -Sky Rim Duathlon
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April 18, 2026 -Earth Day 5K
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April 18, 2026 -Woody’s Tortoise And Hare 5K
Rattler Trail Race
Rattler was created to feature one of Colorado Springs' best city parks, Palmer Park. Runners will enjoy views of the city and Pikes Peak from the sandstone bluffs, while running all of the best trails the park has to offer! Even though the course does not have much vertical gain, it will test runners with […]
All-Out Beat the Heat
One of Colorado's favorite trails meets one of its most glorious parks at our 11th annual Beat the Heat! As courses wind southwest along Big Dry Creek Trail, the remarkable sight of Standley Lake with the Flatirons on the horizon will come into view. Its Endless Series sidekick in September is Fallfest. 5K, 10K, Half Marathon
Polar Plunge 5K
Are you ready for the COOLEST event of the season! Whether you're a daring plunger, a speedy 5K runner/walker, or a thrill-seeker ready to do BOTH, the Polar Plunge & 5K promises non-stop excitement and heart-pumping fun - all while supporting Special Olympics Colorado. Take the plunge into a chilly pool, dash through the 5K, or double […]
Do Not Stop Half Marathon
Question: Is it supposed to be DO NOT STOP, or DONUT STOP? Answer: YES! Like Running or Walking? Love Donuts? This race is for you! Join us for the annual Donot Stop 5k/10k and half marathon! A donut-themed event that is perfect for the whole family. The fun includes great swag (designer shirt, custom medal), […]
Great Western Trail Race
The Great Western Trail is a wide unpaved trail located in rural Weld County in Northern Colorado. The trail connects to the Windsor Trail system on the northeast edge of the Town of Windsor, traveling north to the Town of Severance. From Severance, the trail curves east, and runs through open agricultural lands 7.5 miles […]
Sky Rim Duathlon
FORMAT: 3 mile run - 12.5 mile bike - 3 mile run WHERE: Fort Lewis College. Most of the bike and run courses utilize FLC roads/grounds and Rim Drive. See Course maps.
Woody’s Tortoise And Hare 5K
This race is a true handicap event in that it measures your fitness level based on your age, sex, height and weight! Following a victory at the Boston Marathon, Bill Rodgers said that his effort to run a 2:10 was not nearly as difficult as the effort of those who were “out there for 4 […]
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