Trail Races in Colorado

Run the Ranch

Fri, Apr 10 · Loveland, CO Loveland

Trail 5k10k (heavy)Virtual 4HR/6HR12HR +6

From $45 Open Closing Soon

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The Great CO74 Trail Run

Sat, May 9 · Kittredge, CO Kittredge

Trail The Great CO74 Trail RunThe Great CO74 Kids Run

From $20 Open Closing Soon 35 spots left

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Quad Rock 25 & 50 Mile Trail Races

Sat, May 9 · Bellvue, CO Bellvue

Trail Quad Rock 25Quad Rock 50

From $125 Open

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Endure Trail Runs

Sat, May 16 · Divide, CO Divide

Trail 10kHalf MarathonMarathon +2

From $60 Open

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Farish Trail Race

Sat, May 23 · Woodland Park, CO Woodland Park

Trail Kids Run5K10K +1

From $0 Open

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Summits Trail Runs

Sat, Jun 6 · Granby, CO Granby

Trail 6-MileHalf MarathonMarathon +2

From $60 Open

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Garden of the Gods 10 Mile/10K and Trail Run

Sun, Jun 14 · Colorado Springs, CO Colorado Springs

Trail 10K10 MileTrail Run

From $60 Open

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Sunset Trail Running Festival

Sun, Jun 21 · Boulder, CO Boulder

Trail Kids 1K5K12K +1

From $15 Open

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Race in the Clouds - Alma Dirt Festival 2026

Thu, Jun 25 · Alma, CO Alma

Trail Highschool/Middle School Short Course (6.1miles)Trail 10KNEW 26 Mile Mountain Bike Relay (Teams of Two) +8

From $0 Open

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The Sunlight Showdown

Sat, Jun 27 · Glenwood Springs, CO Glenwood Springs

Trail 5k Trail Run10k Trail Run1/2 Marathon Trail Run

From $35 Open

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Silverheels Trail Runs

Fri, Jul 10 · Como, CO Como

Trail 10-Mile19-Mile60k +3

From $50 Open

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Audi Power of Four Trail Run

Sat, Jul 18 · Aspen, CO Aspen

Trail 10K Run25K Run50K Run

From $105 Open 75 spots left

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Sheep Mountain Trail Runs

Sat, Aug 1 · Fairplay, CO Fairplay

Trail Half Marathon50k50-Mile

From $70 Open

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Kennebec Mountain Run

Sat, Aug 1 · Hesperus, CO Hesperus

Trail 15 Mile

From $75 Open

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Into the Hills Eltuck 10k

Tue, Aug 11 · Bellvue, CO Bellvue

Trail Into the Hills Eltuck 10k

From $25 Open

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The Cheyenne Mountain Run

Sat, Aug 15 · Colorado Springs, CO Colorado Springs

Trail 5K10K25K

From $40 Open

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Into the Hills Eltuck 5k

Tue, Aug 18 · Bellvue, CO Bellvue

Trail Into the Hills Eltuck 5k

From $25 Open

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Eltuck Valley 12K - Lory Summer Trail Series

Tue, Aug 25 · Bellvue, CO Bellvue

Trail Eltuck Valley 12k

From $25 Open

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Cirque Series - Arapahoe Basin, CO

Sat, Sep 5 · Keystone, CO Keystone

Trail Pro DivisionExpert DivisionSport Division (beginner / intermediate)

From $90.15 Open

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Trail Sisters Women's Half Marathon & 10k

Sat, Sep 12 · Buena Vista, CO Buena Vista

Trail Trail Sisters Women's 10kTrail Sisters Women's Half Marathon

From $55 Open

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Red Feather Trail Jamboree

Fri, Sep 25 · Red Feather Lakes, CO Red Feather Lakes

Trail Red Feather Trail Jamboree Half MarathonRed Feather Trail Jamboree 50 MileRed Feather Trail Jamboree 50km +1

From $90 Open

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Estes Epic

Sat, Sep 26 · Estes Park, CO Estes Park

Trail Heavy Half Marathon50k Bike50k Run +1

From $80 Open

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Sangre de Cristo Trail Festival

Sat, Sep 26 · Westcliffe, CO Westcliffe

Trail 8-Mile27k50-Mile +3

From $40 Open

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West Line Winder

Sat, Sep 26 · Buena Vista, CO Buena Vista

Trail 50k30k

From $105 Open

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HRCA Wildcat Mountain Trail Races

Sat, Oct 3 · Littleton, CO Littleton

Trail 10K10MKid's Race

From $10 Open

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Rubey Rescue Run

Sun, Oct 4 · Aspen, CO Aspen

Trail 3.1M Trail Run

From $60.38 Open

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Blue Sky Trail Marathon & Half Marathon

Sat, Oct 17 · Fort Collins, CO Fort Collins

Trail Blue Sky Trail Half MarathonBlue Sky Trail Marathon

From $90 Open

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Indian Creek Trail Runs

Sat, Oct 17 · Sedalia, CO Sedalia

Trail 5-Mile15-Mile55k +1

From $30 Open

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HRCA Backcountry Wilderness Half Marathon

Sat, Nov 7 · Lone Tree, CO Lone Tree

Trail Half Marathon

From $65 Open

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