Running races in Colorado, United States
Find your next race in Colorado, United States. AthRecs lists 24 events with upcoming dates here. Open a race guide for the location, listed distances and entry information where available.
Upcoming running events include 50K races, 10K races, half marathons, 5K races, marathons and 100K races.
Events to explore include Bridge Burner Ultra, Colorado 24 Hour Run and Kessel Run Ultra.
30 listed events · 24 with upcoming dates
Upcoming races
Bridge Burner Ultra
USACanon City, Colorado
Trail races through the Royal Gorge area, starting in Canon City and following riverside paths and mountain trails.
· 10K
Race details, entry and past editions →Colorado 24 Hour Run
USAFort Collins, Colorado
Timed endurance races on a flat dirt loop at Swift Ponds, with six, twelve and twenty-four-hour solo options and corresponding relay divisions.
· 12H
Race details, entry and past editions →Kessel Run Ultra
USAFruita, Colorado
High-desert trail races on the North Fruita singletrack, with five distances and separate morning starts.
· 10mi
Race details, entry and past editions →Sheriff’s Shootout
USAMancos, Colorado
Free six- and twelve-hour trail races on a rugged one-mile loop, with food contributions and a community-pantry donation required.
· 12H
Race details, entry and past editions →Colorado Cold Rush Ultra
USAColorado Springs, Colorado
Trail races from Bear Creek Regional Park, with longer routes climbing historic High Drive above Colorado Springs.
· 10K
Race details, entry and past editions →Sawmill Trail Runs
USAPine, Colorado
Winter trail races through Staunton State Park’s meadows, forests and granite outcrops near Pine.
· 16mi
Race details, entry and past editions →Stories Trail Runs
USAColorado Springs, Colorado
A weekend of timed and fixed-distance winter trail races at Cheyenne Mountain State Park.
· 15H
Race details, entry and past editions →Rattler Trail Race
USAColorado Springs, Colorado
Trail races from Palmer Park in Colorado Springs.
· 10K · Status TBC
Race details, entry and past editions →Take 5 in the Garden
USAColorado Springs, Colorado
Road and trail races in Garden of the Gods, including a combined road-and-trail Double Take course.
· 5K · Status TBC
Race details, entry and past editions →Valkyrie Trail Race
USAColorado Springs, Colorado
Women-focused trail races in Cheyenne Mountain State Park.
· 30K
Race details, entry and past editions →Endure Trail Runs (Colorado)
USADivide, Colorado
Fixed-distance trail races on singletrack and doubletrack in Mueller State Park.
· 10K · Status TBC
Race details, entry and past editions →Colfax Marathon
USADenver, Colorado
Denver May Colfax marathon weekend.
· Marathon
Race details, entry and past editions →BOLDERBoulder
USABoulder, Colorado
Boulder’s Memorial Day 10K.
· 10K
Race details, entry and past editions →Weld Your Mettle Running Festival
USAEaton, Colorado
Loop running races and timed endurance challenges near Eaton.
· 100K
Race details, entry and past editions →Summits Trail Runs
USAGranby, Colorado
Mountain trail races at Granby Ranch Resort, with shorter races and ultra distances.
· 50K · Status TBC
Race details, entry and past editions →Hardrock Hundred
USASilverton, Colorado
High-altitude 100-mile loop through the San Juan Mountains.
· 100 Mile · Status TBC
Race details, entry and past editions →Silverheels Trail Runs
USAComo, Colorado
High-altitude trail and dirt-road races around Como and the South Park Valley.
· 100K · Status TBC
Race details, entry and past editions →Pikes Peak Ultra
USAColorado Springs, Colorado
Mountain ultras and shorter trail races above Colorado Springs.
· 20K
Race details, entry and past editions →Rocky Mountain Half Marathon and 5K
USAEstes Park, Colorado
Road races based at Lake Estes, with a Friday 5K and Saturday half marathon.
· 5K · Status TBC
Race details, entry and past editions →Sheep Mountain Trail Runs
USAFairplay, Colorado
Mountain trail races and a half marathon based at Fairplay Beach.
· 50K · Status TBC
Race details, entry and past editions →Rock Hawk Trail Races
USACastle Rock, Colorado
Trail races on the Miller Park and Ridgeline trail systems.
· 10K · Status TBC
Race details, entry and past editions →Front Range Ultra Dayze
USALoveland, Colorado
Multi-day ultras on a two-mile mixed-surface loop through Centennial Park and Rivers Edge Natural Area.
· 100H
Race details, entry and past editions →Snow Mountain Ranch Trail Running Festival
USAGranby, Colorado
Trail races on Nordic tracks at Snow Mountain Ranch.
· 10K · Status TBC
Race details, entry and past editions →Sangre de Cristo Trail Festival
USAWestcliffe, Colorado
A mountain trail festival near Westcliffe with ultras on Saturday and shorter races on Sunday.
· 100K · Status TBC
Race details, entry and past editions →Planning your next race
Which running races are coming up in Colorado, United States?
Bridge Burner Ultra is listed for 24 October 2026. Colorado 24 Hour Run is listed for 7 November 2026. Kessel Run Ultra is listed for 7 November 2026. Check the race guide and organiser’s latest information before making plans.
What running distances are listed in Colorado, United States?
Look for 50K races, 10K races, half marathons, 5K races, marathons and 100K races in the upcoming listings. If an event offers several distances, check the individual race guide to choose the edition and distance you want to enter.
Where can I find race entry details for Colorado, United States?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.