Events
Race Directors

Ultra Running Events in Colorado

All 50 KM 50 Miles 100 KM 100 Miles 6 Hours 12 Hours 24 Hours

Upcoming Events

Date Event City Distances
06/06/26 Summits Trail Runs Granby 14 Hours , 27.8 Miles , 50 KM
06/06/26 Mace’s Hideout 100 Beulah 50 Miles , 100 Miles
06/06/26 The Great Divide Ultra Divide 50 KM , 50 KM , 50 KM , 100 KM , 100 Miles
06/06/26 Haul Ass Ultra Running Festival Erie 6 Hours , 9 Hours , 12 Hours , 50 KM , 50 Miles
06/13/26 Barr Lake Brighton 50 KM
06/20/26 Ring the Springs Colorado Springs 50 KM , 100 KM
06/20/26 San Juan Solstice Lake City 50 Miles
06/27/26 John Cappis 50K Fat Ass Silverton 19 Hours , 50 KM
06/27/26 Chase the Moon Endurance Run Highlands Ranch 6 Hours , 12 Hours , 50 KM
06/27/26 Estes Park's Backyard Ultra Estes Park Backyard
07/10/26 Silverheels Trail Runs Fairplay 60 KM , 50 Miles , 100 KM , 106.5 Miles
07/10/26 Hardrock 100 Endurance Run Silverton 100 Miles
07/11/26 Silver Rush 50 Leadville 50 Miles
07/17/26 Ouray 100 Mile Endurance Run Ouray 100 Miles
07/17/26 High Lonesome 100 Salida 100 Miles
07/18/26 Power of Four Trail Run Aspen 50 KM
07/18/26 Silverton Alpine Silverton 50 KM
07/18/26 Thumbs Up Summer Slam Estes Park 12 Hours
07/24/26 Never Summer Gould 60 KM , 100 KM
07/25/26 Grand Mesa Ultras Grand Mesa 55 KM , 50 Miles
07/25/26 Creede 100 Creede 100 Miles
07/25/26 Pikes Peak Ultra Colorado Springs 50 KM , 50 Miles
07/27/26 The Summit 200 Frisco 200 Miles
08/01/26 Aspen Backcountry Marathons Aspen 14.6 Miles , 26.2 Miles , 50 KM
08/01/26 Winter Park 50K Winter Park 50 KM
08/01/26 Sheep Mountain Trail Runs Fairplay 50 KM , 50 Miles
08/07/26 HighFive100 Lake City 100 Miles
08/14/26 San Juan Softie 100 Durango 100 Miles
08/15/26 Westminster Trail Race Westminster 50 KM
08/15/26 Roxborough Ultras Littleton 50 KM , 50 Miles
08/19/26 La Garita 200 South Fork 200 Miles
08/22/26 Leadville Trail Leadville 100 Miles
08/22/26 Telluride Mountain Run Telluride 40 Miles , 100 KM
08/29/26 Ouray 50 Mile Endurance Run Ouray 50 Miles
08/29/26 Continental Divide Trail Run Steamboat Springs 50 KM
08/29/26 Rock Hawk Castle Rock 50 KM
09/03/26 Front Range Ultra Dayze Loveland 12 Hours , 24 Hours , 48 Hours , 100 Hours , 50 KM , 100 Miles , 200 Miles
09/05/26 Grand Traverse Mountain Run Crested Butte 40 Miles
09/05/26 Raising the Barr Brighton 6 Hours , 12 Hours
09/05/26 Creede Mountain Run Creede 50 KM
09/11/26 American Heroes Run Longmont 6 Hours , 9 Hours , 24 Hours , 100 Miles
09/12/26 Snow Mountain Ranch Granby 50 KM
09/12/26 Devil on the Divide 50K Empire 50 KM
09/18/26 Run Rabbit Run Steamboat Springs 50 Miles , 100 Miles , 100 Miles
09/26/26 Red Feather Trail Jamboree Red Feather Lakes 50 KM , 50 Miles
09/26/26 WILD Wahatoya Runs La Veta 50 KM
09/26/26 24 Hours of Palmer Lake Palmer Lake 24 Hours
09/26/26 West Line Winder Buena Vista 50 KM
09/26/26 Sangre de Cristo Trail Festival Westcliffe 50 KM , 50 Miles , 100 KM , 101.3 Miles
09/26/26 Crested Butte Ultra Crested Butte 55 KM , 50 Miles
09/27/26 Estes Epic Estes Park 50 KM
09/27/26 Sawatch Ascent Nathrop 50 KM
10/03/26 Above the Clouds Ultra Woodland Park 50 KM
10/03/26 Sage Burner 50k Gunnison 50 KM
10/03/26 The Bear Chase Lakewood 50 KM , 50 Miles , 100 KM
10/03/26 Castle Rock Trail Festival Castle Rock 50 KM
10/10/26 Suffer Better Fall Trail Run Pine 50 KM
10/17/26 Bobcat Trail Races Colorado Springs 50 KM
10/17/26 Indian Creek Trail Runs Sedalia 55 KM , 50 Miles
10/24/26 Bridge Burner Ultra Canon City 50 KM , 35 Miles
11/07/26 Kessel Run Ultra Fruita 50 KM , 40 Miles , 50 Miles
11/07/26 Colorado 24 Hour Run Fort Collins 6 Hours , 12 Hours , 24 Hours
11/21/26 Colorado Cold Rush Ultra Colorado Springs 50 KM
12/05/26 Sawmill Trail Runs Pine 50 KM
02/06/27 Stories Trail Runs Colorado Springs 6 Hours , 15 Hours
04/09/27 Desert Rats Trail Running Festival Fruita 50 KM , 100 KM
04/11/27 NoCo Urban Ultra and Relay Greeley 50 Miles , 100 Miles
04/17/27 Rattler Trail Race Colorado Springs 50 KM
05/01/27 Greenland Trail Races Larkspur 50 KM
05/02/27 The Pilgrimage Mack 150 Hours , 150 Hours
05/08/27 Valkyrie Trail Race Colorado Springs 50 KM
05/15/27 Endure Trail Runs Divide 12 Hours

Past Events

Date Event City Distances
06/05/26 Ragnar Trail Colorado Individual Snowmass Village 6 Hours , 24 Hours
05/30/26 North Fork 50 Mile/50K Pine 50 KM , 50 Miles
05/30/26 Weld Your Mettle Running Festival Windsor 6 Hours , 9 Hours , 12 Hours , 24 Hours , 36 Hours , 48 Hours , 50 KM , 50 Miles , 100 KM , 100 Miles
05/23/26 Samson's Revenge Estes Park 55 KM
05/16/26 Ram Party Colorado Springs 29.4 Miles , 50 KM , 60 KM , 50 Miles , 50 Miles , 55 Miles
05/16/26 Sky Pilots Ouray Backyard Ultra Ouray Backyard
05/09/26 Quad Rock 50 Fort Collins 50 Miles
05/02/26 Collegiate Peaks Trail Run Buena Vista 50 Miles
05/02/26 Colorado Brewery Running Series - Denver Beer Company 50K Arvada 50 KM
04/25/26 Runs With Scissors Races - CO Brighton 50 KM
04/25/26 Falcon 50 Colorado Springs 26.3 Miles , 50 Miles
04/25/26 Royal Gorge Groove Cañon City 50 KM , 55 KM , 60 KM
04/25/26 Cheyenne Mountain Trail Race Colorado Spring 50 KM
04/11/26 Run the Ranch Loveland 6 Hours , 12 Hours
02/06/26 Running Up for Air Pine - Staunton Rocks Pine 6 Hours , 12 Hours , 24 Hours
12/06/25 Thumbs Up Vertical Challenge Estes Park 8 Hours
11/08/25 BINGO! Trail Runs Byers Backyard
10/18/25 Sheriff's Shootout Mancos 6 Hours , 12 Hours
10/18/25 Rabbit Valley Ultras Mack 50 KM , 100 KM
10/11/25 Rocky's Backyard Ultra Race Estes Park Backyard
10/04/25 Taco Bell 50K Denver 50 KM
10/04/25 Hanging Flume 50k Uravan 50 KM
08/23/25 Rio Grande 100 South Fork 100 Miles
07/19/25 Powderhorn Mountain Ultra and Vert Challenge Mesa 6 Hours , 12 Hours
06/21/25 Red, White, and Brew (12 Hour "Last Person Standing" Race) Windsor 12 Hours , 50 Miles
06/07/25 Broken Brain Backyard Craig Backyard
06/05/25 Vail Ultra Benefiting 50 For The Fallen Vail 50 Miles
05/24/25 The Ol' College Try 24 Hour Ultra Denver 6 Hours , 12 Hours , 24 Hours
01/18/25 Resolve to Run 5K & Ultra Challenge Greeley 12 Hours
11/27/24 Mountain Peacock 50k Golden 50 KM
09/21/24 Silver Creek Mountain Runs (Divide 100) Georgetown 50 KM , 50 Miles , 100 KM , 100 Miles
08/09/24 Jess' Backyard Ultra Greeley Backyard
06/29/24 Methodist Mountain Ultra Salida 50 KM
06/16/24 Desert Rats Kokopelli Stage Race Fruita 150 Miles
06/15/24 Cuchara Trail Runs La Veta 55 KM , 60 KM , 50 Miles , 55 Miles
06/15/24 Madness on the Mountain BYU Canon City Backyard
06/15/24 The Crooked Mile - State 48 LMS Canon City Backyard
06/01/24 Latino Ultra Nature Adventure Boulder 55 KM
10/07/23 The Crooked Mile - The Satsang LMS Canon City Backyard
09/16/23 Mountain Rats Festival Eagle 55 KM
07/09/23 Last Call Fifties Fairplay 55 KM , 53.5 Miles
07/01/23 The Crooked Mile - The Sundance LMS Canon City Backyard
06/03/23 South Park Trail Runs Fairplay 24 Miles , 28 Miles , 38 Miles
05/20/23 Tava Canons Colorado Springs 50 Miles
03/11/23 Cuchara Snowshoe Races La Veta 50 KM
10/08/22 Rough Canyon Trail Runs Grand Junction 50 KM , 50 Miles
09/25/22 Pikes Peak APEX Colorado Springs 50 KM
09/17/22 Tava's Shadow Ultra Divide 50 KM , 100 KM
07/30/22 Ole School 50/50 Steamboat Springs 50 KM , 50 Miles
06/18/22 Aspen Loop Ultra Mancos 40 Miles
06/04/22 Durango Skyline Trail Runs Durango 50 KM , 50 Miles
06/03/22 Golden Gate Dirty 30 Black Hawk 50 KM
04/30/22 Front Range Backyard Ultra Arvada Backyard
04/23/22 Smith Mountain Ultra Marathon Delta 20 Miles , 40 Miles
10/23/21 Fox Run Endurance Run Colorado Springs 12 Hours , 50 Miles
10/03/21 Rad Dirt Fest Trinidad 50 KM
10/02/21 Bear Creek Endurance Run Colorado Springs 5 Hours , 10 Hours , 12 Hours
09/12/21 Elevated Running Retreat Salida 30 Miles
09/11/21 Fountain Creek Endurance Run Fountain 12 Hours
09/05/21 Breck Crest Breckenridge 50 KM
08/28/21 Lincoln Mountain Endurance Run Larkspur 6 Hours , 12 Hours
08/07/21 Silverton Ultra Dirty Silverton 60 KM , 100 KM , 100 Miles
07/17/21 Kickers For Kids Fun Run Palmer Lake 50 KM , 50 Miles , 100 KM , 100 Miles
07/16/21 Mount Herman Adventure Run Palmer Lake 50 Miles , 100 Miles , 200 Miles
06/19/21 Happy Camper Endurance Run Westminster 50 Miles , 100 Miles , 150 Miles , 200 Miles
05/22/21 Castlewood Canyon Fun Run Franktown 6 Hours , 10 Hours
10/03/20 Tommyknocker 12-Hour & Mine Shaft Half Golden 12 Hours , 50 KM , 100 KM
08/01/20 Dinosaur100 Trail Race Craig 50 Miles , 100 Miles
06/06/20 Lincoln Mountain Trail Run Larkspur 6 Hours
05/02/20 Cheyenne Mountain Ultra 10x5k Colorado Springs 50 KM
09/22/19 Sunset Trail Running Festival Gold Hill 50 KM
08/09/19 Pagosa Fun 10 Hour Ultra Run Pagosa Springs 10 Hours
03/02/19 Frozen Foot 50 Ultra Race Pagosa Springs 50 KM
08/25/18 Devil Mountain Pagosa Springs 50 KM , 50 Miles
08/11/18 Box Canyon 40 Telluride 55 KM , 40 Miles , 55 Miles
07/14/18 Under Armour Mountain Running Series - Copper Mountain Copper Mountain 50 KM
07/06/18 Steep Camp (Silverton 1000) Silverton 6 Hours , 12 Hours , 24 Hours , 48 Hours , 72 Hours , 144 Hours , 100 Miles
05/18/18 The Divide 135 Ultra Walden 135 Miles
09/02/17 Hideaway Hundred Winter Park 50 KM , 50 Miles , 100 KM , 100 Miles
07/18/17 Colorado 200 Mile Endurance Run Almont 200 Miles
05/07/17 Cimarron Endurance Run Cimarron 50 KM
04/29/17 The Chatfield Ultra Race - C.U.R.E ultras Littleton 50 KM , 50 Miles , 100 KM
10/11/14 24 Hours of Boulder Boulder 6 Hours , 12 Hours , 24 Hours , 50 KM , 100 KM , 100 Miles
09/06/14 Ultra Race of Champions (UROC) - CO Vail 50 KM , 100 KM
07/26/14 Mt. Werner Classic Steamboat Springs 50 KM
07/04/14 Mountain Challenge Series # 3 - July Silverton 48 Hours , 240 Hours
06/14/14 Gunnison 100k Endurance Run Gunnison 100 KM
06/13/14 Mountain Challenge Series: June Silverton 24 Hours , 48 Hours , 72 Hours , 168 Hours , 240 Hours
06/29/13 Silverton 6/12/24 Hour Mountain Runs Silverton 6 Hours , 12 Hours , 24 Hours
06/01/13 Run for Aurora Roxborough 50 KM , 50 Miles
10/03/09 Blue Sky Trail Marathon Fort Collins 50 KM
07/26/08 High Mountain Leadville 50 KM
10/09/04 Telegraph Trail Durango 50 KM
01/17/04 Frozen Ass Trail 30 Mile Littleton 30 Miles
05/25/02 Black Canyon Montrose 50 KM
06/16/01 Colorado Trail Pearl Winter Park 24 Hours
04/07/01 Mile High Metric Challenge Littleton 50 KM
03/11/00 Alfred E. Packer 50 Mile Run Littleton 50 Miles
08/05/88 Vail Valley 50 Mile Vail 50 Miles

Weekly Newsletter

A roundup of the week's content and most recent race results. Sent once a week on Thursday.

Recent Results

Weld Your Mettle Running Festival
Windsor, CO - 27 finishers
100 Miles | 100 KM | 50 Miles | 50 KM
Coz's Backyard Ultra
Holland Patent, NY - 16 finishers
Backyard
High Noon Showdown
Enoree, SC - 17 finishers
12 Hours | 6 Hours | 6 Hours
Cinderella Trail - Spring
Oakland, CA - 28 finishers
50 KM
Momentus Backyard Ultra
Monroe, NC - 74 finishers
Backyard
Rabid Raccoon 100
Beaver Falls, PA - 275 finishers
100 Miles | 100 KM
Mohican Trail Run
Loudonville, OH - 251 finishers
100 Miles | 50 Miles
Hotfoot Hamster
Buckeye, AZ - 94 finishers
24 Hours | 12 Hours | 6 Hours
Chesterfield Gorge Ultra
West Chesterfield, MA - 120 finishers
100 Miles | 100 KM | 50 Miles | 50 KM
North Fork 50 Mile/50K
Pine, CO - 255 finishers
50 Miles | 50 KM
View All Results