Find My Ultra

Ultramarathons in Colorado

All 116 ultramarathons in Colorado, from 50K to 200 miles, with the climb, the cutoff and the date for each. Every race links to its own page, where you can see how it fits the runner you are now.

RaceDistanceWhereDateClimbCutoff
American Heroes Run100 MilesLongmont, COSep 11, 2026—30.183 h
Devil on the Divide 50K50KEmpire, COSep 12, 20266,500 ft11 h
Snow Mountain Ranch 50K50KGranby, COSep 12, 20264,236 ft8.5 h
Run Rabbit Run 100100 MileSteamboat Springs, COSep 18, 202620,391 ft36 h
Run Rabbit Run 50 Mile Endurance Run50 MilesSteamboat Springs, COSep 18, 20267,822 ft15 h
Crested Butte Ultra 50 Mile50 MileCrested Butte, COSep 26, 20268,301 ft15 h
Crested Butte Ultra 55K55KCrested Butte, COSep 26, 20264,567 ft12 h
Elevation Everest41.8 MilesWinter Park, COSep 26, 202630,400 ft17 h
Red Feather Trail Jamboree 50K50KRed Feather Lakes, COSep 26, 20264,200 ft11 h
Red Feather Trail Jamboree 50 Mile50 MileRed Feather Lakes, COSep 26, 20268,500 ft16 h
Sangre de Cristo 100K100KWestcliffe, COSep 26, 202612,400 ft24 h
Sangre de Cristo 100100 MileWestcliffe, COSep 26, 202620,000 ft38 h
Sangre de Cristo 50K50KWestcliffe, COSep 26, 20266,200 ft16 h
Sangre de Cristo 50 Mile50 MileWestcliffe, COSep 26, 202610,000 ft20 h
West Line Winder 50K50KBuena Vista, COSep 26, 20264,000 ft10 h
Wild Wahatoya Runs50 KMLa Veta, COSep 26, 20266,700 ft12 h
Estes Epic Trail 50K50KEstes Park, COSep 27, 2026—12 h
Sawatch Ascent50 KMNathrop, COSep 27, 20267,000 ft10 h
Above the Clouds Ultra50 KMWoodland Park, COOct 3, 20264,137 ft11 h
The Bear Chase 100K100KLakewood, COOct 3, 20264,336 ft16 h
The Bear Chase 50K50KLakewood, COOct 3, 20262,036 ft14 h
The Bear Chase 50 Mile50 MileLakewood, COOct 3, 20263,470 ft15 h
Castle Rock Trail Festival50 KMCastle Rock, COOct 3, 20263,223 ft8 h
Grand Valley BackyardBackyard (4.167-mile yards)Loma, COOct 3, 2026500 ft—
Sage Burner 50K50KGunnison, COOct 3, 20264,500 ft11 h
Bobcat Trail Race 50k50 KMColorado Springs, COOct 17, 20263,838 ft10 h
Indian Creek Fifties 50 Mile50 MileSedalia, COOct 17, 202610,122 ft14 h
Indian Creek Fifties 55K55KSedalia, COOct 17, 20267,185 ft14 h
Bridge Burner Ultra 35 Mile35 MileCanon City, COOct 24, 20264,400 ft9.5 h
Bridge Burner Ultra 50K50KCanon City, COOct 24, 20264,200 ft9.5 h
The Barnyard Backyard UltraBackyard (4.167-mile yards)Erie, COOct 24, 2026200 ft—
11th Hour Bear Creek Backyard UltraBackyard (4.167-mile yards)Lakewood, COOct 31, 2026——
Kessel Run 50 km Ultra Race50 KMFruita, CONov 7, 20263,438 ft10 h
Kessel Run Ultra Race40 MilesFruita, CONov 7, 20264,090 ft12 h
Kessel Run Ultra Race50 MilesFruita, CONov 7, 20265,177 ft14 h
Colorado Cold Rush 50K50KColorado Springs, CONov 21, 20265,500 ft10 h
Sawmill Trail Runs50 KMPine, CODec 5, 20267,490 ft12 h
Desert RATS 100K100KFruita, COApr 10, 20276,632 ft20 h
Desert RATS 50K50KFruita, COApr 10, 20273,660 ft10 h
NoCo Urban Ultra and Relay100 MilesGreeley, COApr 11, 20271,200 ft30.5 h
NoCo Urban Ultra and Relay50 MilesGreeley, COApr 11, 2027400 ft15.75 h
Rattler Trail Race 50K50KColorado Springs, COApr 17, 20273,838 ft10 h
Cheyenne Mountain Trail Race 50K50KColorado Springs, COApr 24, 20273,700 ft10 h
Falcon 5050 MilesColorado Springs, COApr 24, 2027——
Royal Gorge Groove50 KMCanon City, COApr 24, 20273,532 ft—
Runs With Scissors Races - CO50 KMBrighton, COApr 24, 2027—9 h
Collegiate Peaks 50 Mile50 MileBuena Vista, COMay 1, 20277,000 ft12 h
Greenland Trail 50K50KPalmer Lake, COMay 1, 20271,873 ft8 h
Quad Rock 5050 MileFort Collins, COMay 8, 202711,000 ft14 h
Valkyrie Trail Race 50k50 KMColorado Springs, COMay 8, 20274,500 ft10 h
Ram Party 50K50KColorado Springs, COMay 15, 20274,412 ft17 h
Ram Party 55 Mile55 MileColorado Springs, COMay 15, 20276,964 ft17 h
Ram Party 60K60KColorado Springs, COMay 15, 20273,279 ft15 h
Sky Pilots Ouray Backyard UltraBackyard (4.167-mile yards)Ouray, COMay 15, 2027140 ft—
Samson's Revenge50 KMEstes Park, COMay 22, 20276,000 ft9 h
Durango Trails Backyard UltraBackyard (4.167-mile yards)Durango, COMay 29, 2027——
North Fork 50K50KPine, COMay 29, 20273,670 ft13 h
North Fork 50 Mile50 MilePine, COMay 29, 20276,425 ft14 h
The Great Divide Ultra 100K100KDivide, COJun 5, 20278,500 ft22 h
The Great Divide Ultra 100 Mile100 MileDivide, COJun 5, 202716,071 ft36 h
The Great Divide Ultra 50K50KDivide, COJun 5, 20274,200 ft11 h
Haul Ass Ultra Running Festival50 KMErie, COJun 5, 2027200 ft12 h
Mace’s Hideout 100100 MilesBeulah, COJun 5, 202722,500 ft36 h
Mace’s Hideout 10050 MilesBeulah, COJun 5, 2027—13.5 h
Weld Your Mettle Running Festival100 MilesWindsor, COJun 5, 2027—36 h
Weld Your Mettle Running Festival50 KMWindsor, COJun 5, 2027—9.5 h
Weld Your Mettle Running Festival50 MilesWindsor, COJun 5, 2027—14 h
Weld Your Mettle Running Festival100 KMWindsor, COJun 5, 2027—24 h
Barr Lake50 KMBrighton, COJun 12, 2027460 ft9 h
Summits Trail Runs55 KMGranby, COJun 12, 20275,805 ft14 h
Summits Trail Runs43 MilesGranby, COJun 12, 2027—11.5 h
Ring the Springs 100K100KColorado Springs, COJun 19, 202711,000 ft22 h
Ring the Springs 50K50KColorado Springs, COJun 19, 20275,333 ft12 h
San Juan Solstice 5050 MileLake City, COJun 19, 202712,800 ft16 h
John Cappis 50K Fat Ass50 KMSilverton, COJun 26, 202719,000 ft19 h
Hardrock Hundred Mile Endurance Run100 MileSilverton, COJul 9, 202733,441 ft48 h
Silverheels 100K100KComo, COJul 9, 202711,000 ft24 h
Silverheels 100100 MileComo, COJul 9, 202718,172 ft38 h
Silverheels 60K60KComo, COJul 9, 20276,945 ft14 h
Silverheels Last Call 50 Mile50 MileComo, COJul 9, 20279,186 ft23 h
Estes Park's Backyard UltraBackyard (4.167-mile yards)Estes Park, COJul 10, 2027150 ft—
Leadville Silver Rush 5050 MileLeadville, COJul 10, 20278,000 ft14 h
Ouray 100 Mile Endurance Run100 MileOuray, COJul 16, 202740,000 ft52 h
Ouray 50 Mile Endurance Run50 MileOuray, COJul 16, 202723,582 ft24 h
Power of Four Trail Run50 KMAspen, COJul 17, 2027—9 h
Silverton Alpine 50K50KSilverton, COJul 17, 20274,569 ft11 h
High Lonesome 100100 MileNathrop, COJul 23, 202723,500 ft37 h
Creede 100100 MilesCreede, COJul 24, 202720,822 ft40.5 h
Creede 10050 MilesCreede, COJul 24, 2027—13.5 h
Grand Mesa Ultras 50 Mile50 MileCedaredge, COJul 24, 20273,971 ft14 h
Grand Mesa Ultras 55K55KCedaredge, COJul 24, 20273,376 ft11.5 h
Never Summer 100K100KGould, COJul 24, 202714,500 ft24 h
Pikes Peak Ultra 50K50KColorado Springs, COJul 24, 20278,127 ft13.5 h
Pikes Peak Ultra 50 Mile50 MileColorado Springs, COJul 24, 202711,759 ft15 h
Summit 200200 MileFrisco, COJul 26, 202740,000 ft110 h
Aspen Backcountry 50K50KAspen, COJul 31, 20275,512 ft10 h
Sheep Mountain 50K50KFairplay, COJul 31, 20276,200 ft16 h
Sheep Mountain 50 Mile50 MileFairplay, COJul 31, 20279,600 ft16 h
HighFive100100 MilesLake City, COAug 6, 202740,000 ft48 h
Winter Park 50K50 KMWinter Park, COAug 7, 20274,370 ft12.5 h
San Juan Softie 100100 MilesDurango, COAug 13, 202720,000 ft38 h
MOCO Trails Wild West Backyard UltraBackyard (4.167-mile yards)Craig, COAug 14, 2027——
Roxborough Ultras50 KMLittleton, COAug 14, 20274,180 ft10 h
Roxborough Ultras50 MilesLittleton, COAug 14, 20278,450 ft16 h
Westminster Trail Races50 KMWestminster, COAug 14, 20272,358 ft9 h
La Garita 200200 MilesSouth Fork, COAug 18, 2027—86.5 h
Leadville Trail 100 Run100 MileLeadville, COAug 21, 202715,492 ft30 h
Rio Grande 100100 MilesSouth Fork, COAug 21, 2027—38.5 h
Telluride Mountain Run 40 Mile40 MileTelluride, COAug 21, 202715,000 ft17 h
Telluride Mountain Run 65 Mile65 MileTelluride, COAug 21, 202722,500 ft32 h
Continental Divide Trail Run 50K50KSteamboat Springs, COAug 28, 20275,500 ft9 h
Rock Hawk50 KMCastle Rock, COAug 28, 20273,325 ft9 h
Front Range Ultra Dayze100 MilesLoveland, COSep 2, 2027—109 h
Creede Mountain Run50 KMCreede, COSep 4, 20275,600 ft10 h
Front Range Ultra Dayze50 KMLoveland, COSep 4, 2027——
Grand Traverse Mountain Run40 MileCrested Butte, COSep 4, 20276,000 ft12.5 h