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ARAPAHOE BASIN — CIRQUE SERIES
A steep off-trail push straight up Arapahoe Basin's slopes
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Grand Traverse Mountain Run
Point-to-point ultra across the Elk Mountains to Aspen
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Creede Mountain Run
Climbs into the San Juan Mountains past historic mine ruins
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American Discovery Trail Marathon
Runs along the coast-to-coast American Discovery Trail
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Flaming Foliage Relay
A 165 mile team relay from Idaho Springs to Buena Vista
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Devil on the Divide
Climb above 13,000 feet along the Continental Divide
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NedNed Trail Fest
Wind through historic Old Town Nederland on dirt and singletrack
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Black Squirrel Trail Half Marathon
Circle Horsetooth Reservoir with Rocky Mountain views throughout
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Imogene Pass Run
Cross a 13114-foot pass between historic Ouray and Telluride
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Trail Sisters Half Marathon
Twist through sagebrush and pines with Collegiate Peaks views above
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The Denver 5k
Circle iconic Sloan Lake beneath the Denver skyline
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Snow Mountain Ranch Trail Running Festival
Rolling Rockies trails with changing fall colors in Granby
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11th Annual Nun Run
Along Denver's High Line Canal Trail, hosted by nuns
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Run Rabbit Run
Hare and Tortoise starts for a Steamboat Springs ultra
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Ouray Mountain Trail Run
Trail run beneath Ouray's high San Juan peaks
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BREAK OF DAWN | NORTH TABLE MOUNTAIN RACE
Trail race atop Arvada's North Table Mountain
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Run the Rockies Road 10K & Half Marathon
A downhill mountain course through spectacular Ten Mile Canyon
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Golden Gallop
Goldens hometown race finishes under the historic Welcome arch
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Pikes Peak Marathon
The oldest continually held marathon in America, up Pikes Peak
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Red Feather Trail Jamboree
Trails in Roosevelt National Forest near Red Feather Lakes
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West Line Winder
Desert style singletrack beneath the Collegiate Peaks
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Sangre de Cristo Trail Festival
Wild Rocky Mountain trails beneath jagged Sangre de Cristo peaks
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Cougar Ridge Classic
Point to point race across Vail Mountain and golden aspens
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Deep Creek Half Marathon
Singletrack half marathon through golden aspens near Telluride
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Elevation Everest
Climb the total elevation of Everest lap by lap
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So Long to Summer 5K/10K
Finish-line pancake breakfast benefits scholarships
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Crested Butte Ultra
Singletrack through Gunnison National Forest's high meadows
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Golden Leaf Half Marathon
Point-to-point through golden aspens, Snowmass to Aspen
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Estes Epic
Rugged singletrack ultra through Rocky Mountain National Park
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Boulderthon: Downtown Boulder Marathon
Fast point-to-point marathon through downtown Boulder
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Sawatch Ascent
High alpine 50k climbing 7000 feet beneath the Sawatch peaks
Save any of these to your season in RunCalendar and hear the morning entries open. Free on iPhone, no account needed.
Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.