Races in CO, United States
148 upcoming races in CO, United States.
148 races found
Run the Ranch
For the 6th year running and partnering with the Sylvan Dale Guest Ranch, we are bringing back an amazing and beautiful trail race to Loveland, CO. You will have 6 distances to choose from.
Mountain Ridge
Mountain Ridge is a 10 km trail race held in Highlands Ranch, CO. The event takes place in April 2026.
RMRR Spring Marathon Training Series #2
RMRR provides consistent and individualized marathon training opportunities for runners of all abilities. All races in the series are low cost, friendly, fully supported, and officially timed.The first two races, March 29 & April 11, are 10 Mile and 20 Mile races (runners choice for distance).
CRMAC Uplift Her - 5K Run/Walk
Run or walk with purpose and help us take steps toward ending period poverty in Northern Colorado. Did you know that in the US 1 in 5 girls miss school because she does not have access to the products she needs when she has her period?
ASDAsh 5K to Beat Tooth Decay
ASDAsh 5K to Beat Tooth Decay is a 5K road race held in Aurora, CO. We are excited to share that our 5K course has been revamped this year to offer a fresh new route through campus.
Run Through The Decades 6K/7K/8K/Half - Colorado Springs
Step back in time and hit the streets to the soundtrack of three iconic eras at Run Through the Decades—a race that celebrates the unforgettable music of the 60s, 70s, and 80s. Whether you love the soulful rhythms of the 60s, the funky grooves of the 70s, or the neon-charged energy of the 80s, this event brings each decade to life—one mile at a time.
Dash for Detection: Oral Cancer Awareness 5K
***RACE POSTPONED TO 2027*** We regret to inform you that the 2026 Dash for Detection: Oral Cancer Awareness 5K has been canceled. Due to circumstances beyond our control, we were unable to secure the necessary credentialing to move forward with the event this year.
Rockin on the River 5K
Dust off your well-loved t-shirts and show 'em off at the Rockin' on the River 5K. Pre and post-race music from Vinyl Nation and entertainment for all.
Donut Dash
The Donut Dash 5K is Denver’s race that ends with donuts. Runners and walkers can take advantage of a flat and fast course, and then enjoy fresh donuts at the finish.
Hop Into Spring 5K - Denver
Hop Into Spring 5K - Denver is a 5K road race held in Denver, CO. Shake off winter and welcome the sunshine at the Hop Into Spring 5K.
Healthy Kids Running Series Spring 2026 - Denver, CO
Who We Are: Healthy Kids Running Series is a five (5) week running program in the spring and fall for kids Pre-K through 8th grade. Each HKRS Series takes place once a week and offers age-appropriate running events including the 50 & 75 yard dashes, the 1/4 mile, the 1/2 mile and the 1 mile run.
RMRR April Trophy Series
April is a lovely time to run with RMRR, and the City Park 4 mile run is a great way to celebrate spring. We usually have fabulous spring weather for this run, and it’s fun to run around the park and the zoo.
Healthy Kids Running Series Spring 2026 - Fort Collins, CO
Who We Are: Healthy Kids Running Series is a five (5) week running program in the spring and fall for kids Pre-K through 8th grade. Each HKRS Series takes place once a week and offers age-appropriate running events including the 50 & 75 yard dashes, the 1/4 mile, the 1/2 mile and the 1 mile run.
Boulder Track Series Meet 1
We are pleased to offer 2 x Spring track meets (4/12 and 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.
Spring Fling Prairie Dog Half, 10k, & 5k
Spring Fling Prairie Dog Half, 10k, & 5k is a 5K road race held in Arvada, CO. This spring-time event also features 10k & 5k distances.
NoCo Urban Ultra & Relay
50 Mile Solo Race 100 Mile Solo Race 50 Mile Relay Race 100 Mile Relay Race Join miles.Beyond in celebrating the Poudre River Trail. This long-distance race takes you on a sprawling tour of Northern Colorado via the picturesque Poudre River Trail.
Prairie Dog Run Series
Join Peedy the Prairie Dog in Colorado every season for the Prairie Dog Race Series.
Healthy Kids Running Series Spring 2026 - Aurora, CO
Who We Are: Healthy Kids Running Series is a five (5) week running program in the spring and fall for kids Pre-K through 8th grade. Each HKRS Series takes place once a week and offers age-appropriate running events including the 50 & 75 yard dashes, the 1/4 mile, the 1/2 mile and the 1 mile run.
Donot Stop Half Marathon (5k/10k) - Colorado Springs
Question: Is it supposed to be DO NOT STOP, or DONUT STOP? A donut-themed event that is perfect for the whole family.
All-Out Beat the Heat
Unleash your inner superhero at the 14th Annual Beat the Heat event. This year, we're calling all champions to assemble where one of Colorado's favorite trails joins one of its most glorious parks, and support the vital mission of Adaptive Adventures.
Great Western Trail Race
We're not hosting this race in 2026 but stay tuned...it may be back in the future. The NOCO Urban Ultra features a 50 Mile and 100 Mile Solo or Relay option.
Earth Day 5K
The race will be on 04/18/26 at 8:30 AM at Rotary Park in Durango. Runners and walkers will go north on the Animas River Trail from Rotary Park, and will run or walk 1.55 miles north to just before 32nd Street.
Woody's Tortoise And Hare
Woody’s Tortoise and Hare is a true handicap event in that it measures your fitness level based on your age, gender, height and weight. Factor out age, size, and gender and what do you have left?
Rattler Trail Race
Rattler Trail Race is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in April 2026.
The Rocky Run by Eldorado PK-8 PTO
By participating, you will directly benefit over 700 children in our community, enriching their education and supporting an array of extraordinary programs that make Eldorado PK-8 a standout school. This event is one of our main fundraising efforts for the school.
2026 Fairmount Fit Fest
Fairmount Fit Fest (formerly the Fairmount 5K) is back — with more ways for the whole family to join the fun . The 5K is one of Fairmount's favorite long-standing community traditions.
DoNot Stop Half Marathon (5k/10k) - Denver
Question: Is it supposed to be DO NOT STOP, or DONUT STOP? A donut-themed event that is perfect for the whole family.
Horsetooth Half Marathon - Presented by Fort Collins Connexion
Horsetooth Half Marathon - Presented by Fort Collins Connexion is a half marathon trail race held in Fort Collins, CO. Your race will take you on a scenic point-to-point journey from the location of Hughes Stadium, the former home of the CSU Rams, to the finish line party at New Belgium Brewery.
Hot Laps - Denver
When : April 24, 2026 | Meet up : 5:30pm, Race : 6:30pm, Finals : 7:30pm, End :10pm Where : Little Machine Join us for the fourth round of Hot Laps sponsored by Runners Roost and Citius RC powered by . The rules stay the same this year, but the course takes steps elsewhere.
Cheyenne Mountain Trail Race
Cheyenne Mountain Trail Race is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in April 2026.
Falcon 50
Falcon 50 is a 81 km ultra trail race held in Colorado Springs, CO. The event takes place in April 2026.
Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA
☕️For all the Coffee Lovers, this run is for you. You’ll love the shirt we send you.
Royal Gorge Groove
Royal Gorge Groove is a 50 km ultra trail race held in Cañon City, CO. The event takes place in April 2026.
Run for Donuts 5K/10K/13.1 DENVER/AURORA
♂️♂️♂️ Running for donuts is worth the pain. You'll get a run for donuts shirt to show off what you run for.
5Point 5k
5Point 5k is a 5.0 km trail race held in Carbondale, CO. The event takes place in April 2026.
Greenland Trail Races
The Greenland Trail Race offers four outstanding distances in southern Douglas County. Run the 4 Miler, the 8 Miler, the 25K, or tackle the 50K ultramarathon, Colorado’s fastest 50K.
Take 5 in the Garden
Take 5 in the Garden is a 5.0 km trail race held in Colorado Springs, CO. The event takes place in May 2026.
Collegiate Peaks Trail Run
Collegiate Peaks Trail Run is a 81 km ultra trail race held in Buena Vista, CO. The event takes place in May 2026.
The Pilgrimage
The Pilgrimage is a trail race held in Mack, CO. The event takes place in May 2026.
Adventure Fest at 18 Road
Adventure Fest at 18 Road is a half marathon trail race held in Fruita, CO. The event takes place in May 2026.
Quad Rock 25 & 50 Mile Trail Races
Quad Rock 25 & 50 Mile Trail Races is a 50 mile trail race held in Bellvue, CO. Taking place on the trails and hills west of Fort Collins in Lory State Park and Horsetooth Mountain Park, the Quad Rock loop will take you on a tour of the Fort Collins skyline, situated on the.
The Great CO74 Trail Run
Kittredge Park → Columbine → Private Kittredge Land → O’Fallon → Back to the Park Join us for a one-of-a-kind community trail race through the heart of Kittredge. This 7.4-mile route starts at Kittredge Park, runs down Columbine, crosses through a special stretch of private Kittredge property, winds through the beautiful canyon trails of O’Fallon, and loops.
Valkyrie Trail Race
Valkyrie Trail Race is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in May 2026.
Western Colorado Trail Running Camp
Western Colorado Trail Running Camp is a trail race held in Palisade, CO. The event takes place in May 2026.
Endure Trail Runs
The Human Potential Running Series Presents: The Endure Trail Runs @ Mueller State Park The Endure 12-Hour is a one-of-a-kind 12-Hour timed event designed by YOU… and tiny colorful balls. Each runner will pull colored balls from a bucket, which determines the loop they’ll next run.
Ram Party
Ram Party is a 60 km ultra trail race held in Colorado Springs, CO. The event takes place in May 2026.
Sky Pilots Ouray Backyard Ultra
Sky Pilots Ouray Backyard Ultra is a ultra trail race held in Ouray, CO. The event takes place in May 2026.
MT SOPRIS RUN-OFF
MT SOPRIS RUN-OFF is a 28 km trail race held in Carbondale, CO. The event takes place in May 2026.
Samson's Revenge
Samson's Revenge is a 50 km ultra trail race held in Estes Park, CO. The event takes place in May 2026.
Farish Trail Race
Date: May 23, 2026 Location: Farish Recreation Area at 12005 Rampart Range Rd Woodland Park, CO 80863 Start times: 7:00 am – 8:00 am Distance: Half Marathon, 10K, 5K 1 Mile Kids Fun Run (Free). USAFA, CO, 80840 Base access ID is required for USAFA ODR.
Weld Your Mettle Running Festival
Weld Your Mettle Running Festival is a trail race held in Eaton, CO. Whether you're tackling the events individually or teaming up for relays: 14 mile, full marathon, 50k, 5 miles 100k,100 miles, or taking on a 7K Run or Ruck, - there's an event for everyone.
Durango Trails Backyard Ultra
Durango Trails Backyard Ultra is a ultra trail race held in Durango, CO. The event takes place in May 2026.
North Fork 50 Mile/50K
North Fork 50 Mile/50K is a 50 km ultra trail race held in Buffalo Creek, CO. The event takes place in May 2026.
Leadville Turquoise Lake 20K
Leadville Turquoise Lake 20K is a 20 km trail race held in Leadville, CO. The event takes place in May 2026.
Fish Hatchery 5K Trail Run
Fish Hatchery 5K Trail Run is a 5.0 km trail race held in Leadville, CO. The event takes place in May 2026.
The Great Divide Ultra
The Great Divide Ultra is a 100 km ultramarathon trail race held in Divide, CO. The event takes place in June 2026.
Haul Ass Ultra Running Festival
Haul Ass Ultra Running Festival is a 5.0 km trail race held in Erie, CO. The event takes place in June 2026.
Mace’s Hideout 50/100
Mace’s Hideout 50/100 is a 161 km ultramarathon trail race held in Beulah, CO. The event takes place in June 2026.
Summits Trail Runs
The Human Potential Running Series Presents: The Summits Trail Runs @ Granby Ranch Resort The Summits Trail Runs occur at Granby Ranch Resort in Colorado's beautiful Rocky Mountains. These challenging trail races offer a variety of distances ranging from shorter runs to ultra distances, each course showcasing sweeping mountain vistas, dense forests, and rugged alpine terrain.
Gold Roots Trail Series
Run the Mighty ARGO hill this summer in a 4 race series. This is a grass(gold)roots, backyard style event.
Barr Lake
Barr Lake is a 50 km ultra trail race held in Brighton, CO. The event takes place in June 2026.
Garden of the Gods 10 Mile/10K and Trail Run
The Garden of the Gods Ten Mile, 10K, and Trail Run® is the premier race of Colorado Springs, coursing through the 300′ towering sandstone rock formations of Garden of the Gods Park, including the. For over 45 years, the Garden of the Gods races offers a spectacular setting, a physically demanding course, competition in almost every age-group, excellent runner support, unique awards and great.
San Juan Solstice 50
San Juan Solstice 50 is a 81 km ultra trail race held in Lake City, CO. The event takes place in June 2026.
Ring the Springs
Ring the Springs is a 100 km ultramarathon trail race held in Colorado Springs, CO. The event takes place in June 2026.
Red, White and Brew 5k, 10k & Half Marathon
Walk, run or ruck, a 5k, 10k or Half Marathon to celebrate the Red, White and Brew in Windsor, CO. Starting and ending at The Grainhouse at Hoedown Hill in Water Valley, this race has fun for the whole family.
Sunset Trail Running Festival
Sunset Trail Running Festival is a trail race held in Boulder, CO. Hosted by The Boulder Watershed Collective and in collaboration with T.E.A.M Boulder, all money raised from the event will be donated to the town of Gold Hill, and will fund wildfire preparation and.
Race in the Clouds - Alma Dirt Festival 2026
Race in the Clouds - Alma Dirt Festival 2026 is a trail race held in Alma, CO. June 26 - 28 2026 | Alma, Colorado | Elevation: 10,600 ft Get ready for a weekend of epic outdoor adventure at 10,600 feet in beautiful Alma, Colorado—the highest incorporated town in North America.
Estes Park's Backyard Ultra
Estes Park's Backyard Ultra is a ultra trail race held in Estes Park, CO. The event takes place in June 2026.
The John Cappis
The John Cappis is a 50 km ultra trail race held in Silverton, CO. The event takes place in June 2026.
Chase the Moon
Chase the Moon is a 50 km ultra trail race held in Highlands Ranch, CO. The event takes place in June 2026.
The Sunlight Showdown
The Sunlight Showdown is a trail race held in Glenwood Springs, CO. Are you ready to take on the challenge?
Leadville Firecracker 5K
Leadville Firecracker 5K is a 5.0 km trail race held in Leadville, CO. The event takes place in July 2026.
Silverheels Trail Runs
The Human Potential Running Series Presents: The Silverheels Trail Runs @ COMO ROUNDHOUSE The Silverheels Trail Runs take place at an average elevation of over 10,000’, in one of the most visually. The course features a mixture of single track trails and fire roads, with a few stretches of dirt road; it takes runners through high alpine and sub-alpine meadows loaded with wild flowers, with.
Hardrock 100 Endurance Run
Hardrock 100 Endurance Run is a 161 km ultramarathon trail race held in Silverton, CO. The event takes place in July 2026.
Hardrock 100
100 miles through the San Juan Mountains.
High Lonesome 100
The High Lonesome 100 is a high flying endurance race in the Sawatch range of the Colorado Rocky Mountains. With 23,500' of vertical gain and reaching an elevation of 13,100', it's a hell of a course.
Ouray 100 Mile Endurance Run
Ouray 100 Mile Endurance Run is a 161 km ultramarathon trail race held in Ouray, CO. The event takes place in July 2026.
Silverton Alpine Runs
Silverton Alpine Runs is a 50 km ultra trail race held in Silverton, CO. The event takes place in July 2026.
Audi Power of Four Trail Run
The Audi Power of Four Trail Run offers runners a scenic mix of trails across the mountains of Aspen Snowmass. Registrants can choose between the 3 distances offered including 50K, 25K & 10K.
Thumbs Up Summer Slam
Thumbs Up Summer Slam is a trail race held in Estes Park, CO. The event takes place in July 2026.
TransRockies Run - Pass to Pub
TransRockies Run - Pass to Pub is a half marathon trail race held in Leadville, CO. The event takes place in July 2026.
Kendall Mountain Run
Kendall Mountain Run is a 11 km trail race held in Silverton, CO. The event takes place in July 2026.
Never Summer 100km & 60km
The Never Summer 100km, 60km and Dirty Double 100 miler will take place almost entirely within the boundaries of State Forest State Park and run between the Never Summer Mountains on the northern. The first 20 miles of each race will offer a tour of the peaks and alpine lakes of the northern Never Summer Mountains, before the route crosses below Cameron Pass and heads north into the southern.
Creede 50/100
Creede 50/100 is a 161 km ultramarathon trail race held in Creede, CO. The event takes place in July 2026.
Box Canyon Trail Races
Box Canyon Trail Races is a 30 km trail race held in Telluride, CO. The event takes place in July 2026.
Grand Mesa Ultras
Grand Mesa Ultras is a 55 km ultra trail race held in Grand Mesa, CO. The event takes place in July 2026.
Pikes Peak Ultra
Pikes Peak Ultra is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in July 2026.
World Championship Pack Burro Race
The first year of the World Championship Pack Burro Race in 1949 saw 21 entrants with only 8 finishing the race. These days there are nearly 100 racers and burros that take on this historic challenge.
The Summit 200
The Summit 200 is a trail race held in Frisco, CO. The event takes place in July 2026.
Winter Park 50K
Winter Park 50K is a 50 km ultra trail race held in Winter Park, CO. The event takes place in August 2026.
Kennebec Mountain Run
Kennebec Mountain Run is a trail race held in Hesperus, CO. Test your alpine running skills on this rugged course that features 3,100 feet of elevation gain, topping out at 12,200 feet through Kennebec Pass.
Sheep Mountain Trail Runs
The Human Potential Running Series Presents: The Sheep Mountain Trail Runs @ Fairplay, CO Come ready my friends, this mountain throws everything it has at trail and ultra runners alike, challenging. You’ll run amongst these “beautifully difficult” mountains and hills lining the western slope of the South Park Valley.
Aspen Backcountry
Aspen Backcountry is a 50 km ultra trail race held in Aspen, CO. The event takes place in August 2026.
Spartan Race Trifecta Weekend
Spartan Race Trifecta Weekend is a 45 km obstacle race held in Breckenridge, Colorado.
Eltuck Valley 5K - Lory Summer Trail Series
Eltuck Valley 5K - Lory Summer Trail Series is a 5K trail race held in Fort Collins, CO. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their toes into the trail racing waters, and to offer more experienced trail racers a.
High Five 100
High Five 100 is a 161 km ultramarathon trail race held in Lake City, CO. The event takes place in August 2026.
Dirt Circus - Boulder
Dirt Circus - Boulder is a trail race held in Boulder, CO. The event takes place in August 2026.
Into the Hills Eltuck 10k
Into the Hills Eltuck 10k is a 10K trail race held in Bellvue, CO. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their toes into the trail racing waters, and to offer more experienced trail racers a.
San Juan Softie 100
San Juan Softie 100 is a 161 km ultramarathon trail race held in Durango, CO. The event takes place in August 2026.
Roxborough Ultras
Roxborough Ultras is a 50 km ultra trail race held in Littleton, CO. The event takes place in August 2026.
Westminster Trail Races
Westminster Trail Races is a 50 km ultra trail race held in Westminster, CO. The event takes place in August 2026.
The Cheyenne Mountain Run
The Cheyenne Mountain Run features three scenic trail races inside Cheyenne Mountain State Park: 25K Mountain Challenge – for advanced trail runners 10K Trail Race – for experienced runners 5K.
MOCO Trails Wild West Backyard Ultra
MOCO Trails Wild West Backyard Ultra is a ultra trail race held in Craig, CO. The event takes place in August 2026.
Leadville Trail 100 Run
100 miles at altitude in the Colorado Rockies.
Into the Hills Eltuck 5k
Into the Hills Eltuck 5k is a 5K trail race held in Bellvue, CO. Our goal is to offer a fun, low-key series of races designed to give newer trail runners an opportunity to dip their toes into the trail racing waters, and to offer more experienced trail racers a.
Telluride Mountain Run
Telluride Mountain Run is a 39 km trail race held in Telluride, CO. The event takes place in August 2026.
Eltuck Valley 12K - Lory Summer Trail Series
Eltuck Valley 12K - Lory Summer Trail Series is a trail race held in Bellvue, CO. This fourth race of the series will take place on the fast and flat Valley Trail at Lory State Park.
Continental Divide Trail Run
5 Mile, 16 Mile and 50K trail races in Steamboat Springs, Colorado.
Ouray 50 Mile Endurance Run
Ouray 50 Mile Endurance Run is a 81 km ultra trail race held in Ouray, CO. The event takes place in August 2026.
Rock Hawk
Rock Hawk is a 50 km ultra trail race held in Castle Rock, CO. The event takes place in August 2026.
Front Range Ultra Dayze
Front Range Ultra Dayze is a ultra trail race held in Loveland, CO. The event takes place in September 2026.
Cirque Series - Arapahoe Basin, CO
Cirque Series - Arapahoe Basin, CO is a trail race held in Keystone, CO. 9.4 miles featuring 2,211' ft vert.
Creede Mountain Run
Creede Mountain Run is a 50 km ultra trail race held in Creede, CO. The event takes place in September 2026.
American Heroes Run
American Heroes Run is a 161 km ultramarathon trail race held in Longmont, CO. The event takes place in September 2026.
Devil on the Divide
Devil on the Divide is a 50 km ultra trail race held in Empire, CO. The event takes place in September 2026.
Trail Sisters Women's Half Marathon & 10k
A Half Marathon and 10K that twist and turn through sage brush and ponderosa pines, all while providing stunning views of the prestige Collegiate Peaks. Located in the Rocky Mountains along the roaring Arkansas River.
53rd Annual Imogene Pass Run
REGISTRATION OPENS JUNE 1 at 6AM MDT The 53rd Annual Imogene Pass Run scheduled for Saturday September 12, 2026. Registration will open on June 1st at 6am MDT, 1550 entries will be offered and we expect to sell out quickly.
Snow Mountain Ranch
Snow Mountain Ranch is a 50 km ultra trail race held in Granby, CO. The event takes place in September 2026.
Run Rabbit Run
Run Rabbit Run is a 161 km ultramarathon trail race held in Steamboat Springs, CO. The event takes place in September 2026.
Break of Dawn North Table Trail Race
Break of Dawn North Table Trail Race is a 16 km trail race held in Golden, CO. The event takes place in September 2026.
Ouray Mountain Trail Run
Ouray Mountain Trail Run is a trail race held in Ouray, CO. The event takes place in September 2026.
CG Adventure Club - Elevation Everest
CG Adventure Trip – Mountain Experience This event is a guided CG adventure weekend designed to combine structured training, accountability, community, and an elevated mountain experience. Participants can choose from three registration options based on how much support, logistics, and included amenities they prefer.
Red Feather Trail Jamboree
Red Feather Trail Jamboree is a trail race held in Red Feather Lakes, CO. Come enjoy the clean air and wild spaces of the Red Feather Lakes region in Northern Colorado.
Crested Butte Ultra
Crested Butte Ultra is a 55 km ultra trail race held in Crested Butte, CO. The event takes place in September 2026.
Sangre de Cristo Trail Festival
The Human Potential Running Series Presents The Sangre de Cristo Trail Festival @ Music Meadows Ranch Come join us on the Rainbow Trail in the Sangre de Cristo mountains. Run beneath the watchful eye of gorgeous, jagged, and ominous peaks from the confines of the rolling Rainbow Trail.
West Line Winder
With glorious views of the Collegiate Peaks and 4,000ft of ascent along the way, these 18 or 30 miles of buttery single track and forest roads are perfect for everyone from the first time trail. Although the Arkansas Valley is famously known for its high alpine peaks, it’s a well kept secret that there’s a stash of arid, desert style trails just outside of Buena Vista (BEW-na Vista), CO -.
WILD Wahatoya Runs
WILD Wahatoya Runs is a 50 km ultra trail race held in La Veta, CO. The event takes place in September 2026.
Deep Creek Trail Half Marathon
Deep Creek Trail Half Marathon is a marathon trail race held in Telluride, CO. The event takes place in September 2026.
24 Hours of Palmer Lake
24 Hours of Palmer Lake is a trail race held in Palmer Lake, CO. The event takes place in September 2026.
Estes Epic
Join us for the Estes Epic on September 26-27, 2026 —a premier event featuring a 50k Bike Race, 50k Run, and Heavy Half Marathon. After a six-year hiatus, this challenging race returns, offering participants rugged trails, significant climbs, and breathtaking views of Rocky Mountain National Park.
Sawatch Ascent
A classic, high-alpine, vert-heavy Colorado 50k. Get some miles on the Colorado Trail and run all the way to 13,150' feet in elevation.
HRCA Wildcat Mountain Trail Races
The Wildcat Mountain Trail Races showcase some of the most scenic terrain in the HRCA Backcountry Wilderness Area, giving runners a true taste of the rolling hills, open views, and natural beauty. Each fall, participants take on two distances—a 10-mile and a 10K—designed to highlight the area’s unique, beautiful trails.
Above the Clouds Ultra
Above the Clouds Ultra is a 50 km ultra trail race held in Woodland Park, CO. The event takes place in October 2026.
Sage Burner Trail Race
Sage Burner Trail Race is a 50 km ultra trail race held in Gunnison, CO. The event takes place in October 2026.
The Bear Chase
The Bear Chase is a 100 km ultramarathon trail race held in Lakewood, CO. The event takes place in October 2026.
Grand Valley Backyard
Grand Valley Backyard is a trail race held in Loma, CO. The event takes place in October 2026.
Rubey Rescue Run
Rubey Rescue Run is a trail race held in Aspen, CO. This is a timed race with cash prizes for top 3 female and male finishers.
Blue Sky Trail Marathon & Half Marathon
Blue Sky Trail Marathon & Half Marathon is a half marathon trail race held in Fort Collins, CO. Taking place on the trails between Horsetooth Mountain Park and the Devil's Backbone Open Space, the course takes you on a north-south tour of the easternmost hogbacks of Northern Colorado's mighty.
Indian Creek Trail Runs
The Human Potential Running Series Presents The Indian Creek Trail Runs @ Indian Creek Campground The Indian Creek Trail Runs is the oldest official race of HPRS and is also known as our annual “Fall . Participants will travel through the lower and upper montane ecosystems of the Front Range; from the lodgepole pine forest around 6,000-8,000′ sprinkled with sprawling aspen groves, down to the.
Bobcat Trail Races
Bobcat Trail Races is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in October 2026.
Bridge Burner Ultra
Bridge Burner Ultra is a 50 km ultra trail race held in Canon City, CO. The event takes place in October 2026.
Marathon At The MAC
Marathon At The MAC is a 5.0 km trail race held in Castle Rock, CO. The event takes place in November 2026.
Kessel Run Ultra
Kessel Run Ultra is a 50 km ultra trail race held in Fruita, CO. The event takes place in November 2026.
HRCA Backcountry Wilderness Half Marathon
The 18th Annual Backcountry Wilderness Half Marathon returns to Highlands Ranch on Saturday, November 7, 2026, at 9:00 a.m. This 13.1-mile race winds through the Douglas County East/West Trail and the scenic Highlands Ranch Backcountry Wilderness Area—offering singletrack, hills, and breathtaking views at every turn.
Louisville Trail Race
Louisville Trail Race is a 10 km trail race held in Louisville, CO. The event takes place in November 2026.
Colorado Cold Rush Ultra
Colorado Cold Rush Ultra is a 50 km ultra trail race held in Colorado Springs, CO. The event takes place in November 2026.
Sawmill Trail Runs
The Human Potential Running Series Presents: The Sawmill Trail Runs @ Staunton State Park The Sawmill Trail Runs; first started as a “Fat Ass” event at White Ranch Open Space in Golden, CO in. We incorporated it into an official trail race starting in December 2017.
Sky Pilots Club Membership
Sky Pilots Club Membership is a trail race held in Ouray, CO. The event takes place in December 2026.