Running Races in Colorado — 2026

There are 435 running races in Colorado in 2026 across 107 cities. The next upcoming race is the Dash for Detection: Oral Cancer Awareness 5K in Denver on April 11. Popular distances include 5K races, trail runs, half marathons.

RMRR July Trophy Series

Sun, Jul 12 · Lakewood, CO Lakewood

Road 2mi

From $10 Open

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PNAAF 5K Wellness Challenge

Thu, Jul 16 · Colorado Springs, CO Colorado Springs

Virtual PNAAF 5K Wellness ChallengeVirtual 5K

From $35 Open

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High Lonesome 100

Fri, Jul 17 · Nathrop, CO Nathrop

Ultra 100 Miler

From $465 Open

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2026 OCA Colorado 5K Panda Run

Sat, Jul 18 · Denver, CO Denver

Road 2026 OCA Colorado 1K Panda Walk2026 OCA Colorado 5K Panda Run

From $35 Open

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Festival in the Clouds Firefighter 5K, Fun Run and Doggie Dash

Sat, Jul 18 · Alma, CO Alma

Road 5K Fun Run and Doggie Dash5K Fun Run and Doggie Dash - Youth Racer 6-125K Fun Run and Doggie Dash - Youth Racer 5 and Under

From $0 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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Heritage Eagles 5K

Sat, Jul 18 · Littleton, CO Littleton

Road Heritage Eagles 5K

From $25 Open

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Expedition Maroon Bells

Sat, Jul 18 · Aspen, CO Aspen

Freedom ExpeditionFreedom Expedition DepositFreedom Expedition Leadership Team

From $0 Open 5 spots left

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Summer Splash Prairie Dog Half, 10k, & 5k

Sat, Jul 18 · Castle Rock, CO Castle Rock

Road 5k10kHalf Marathon

From $25 Open

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Spring Creek Memorial Trail Run

Sat, Jul 18 · Steamboat Springs, CO Steamboat Springs

Road 5k9.5 Mile

From $25.75 Open 100 spots left

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Barr Trail Mountain Race

Sun, Jul 19 · Manitou Springs, CO Manitou Springs

Road Aid Station Challenge SponsorBTMR

From $75 Open 16 spots left

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14er Challenge

Thu, Jul 23 · Buena Vista, CO Buena Vista

14er Challenge 2026

From $249 Open 40 spots left

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BRR All-Comers Summer Track & Field Series #4

Thu, Jul 23 · Boulder, CO Boulder

Road 100M200M400M +10

From $20 Open 15 spots left

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Never Summer 100km & 60km

Fri, Jul 24 · Walden, CO Walden

Ultra Never Summer 60kmNever Summer 100kmThe Double (60km & 100km)

From $175 Open 20 spots left

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Flyin' Ryan Memorial 5k

Fri, Jul 24 · Loveland, CO Loveland

Road Flyin' Ryan Memorial 5k

From $25 Open

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The Hero's Journey 5K

Sat, Jul 25 · Aurora, CO Aurora

Virtual Kids Fun Run5K Under 21Virtual 5K +1

From $10 Open

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CEROX + IRON

Sat, Jul 25 · Frederick, CO Frederick

Cerox Iron Teams of 2Cerox IndividualCerox Teams of 2 +1

From $45 Open

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Aspen Valley Marathon

Sat, Jul 25 · Aspen, CO Aspen

Road Aspen Valley Marathon 5KAspen Valley HALF MarathonAspen Valley Marathon

From $55 Open Closing Soon

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Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA

Sat, Jul 25 · Centennial, CO Centennial

Virtual Family Fun Run 1 Mile5K Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

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Run for Donuts 5K/10K/13.1 DENVER/AURORA

Sat, Jul 25 · Centennial, CO Centennial

Virtual Family 1 Mile Fun RunVirtual Run Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

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Spirit of the West 5K Run/Walk

Sun, Jul 26 · Golden, CO Golden

Road 5K Run/Walk

From $35 Open

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World Championship Pack Burro Race

Sun, Jul 26 · Fairplay, CO Fairplay

Ultra Short Course, approximately 12.3 milesLong Course, 29+ miles

From $70 Open

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Wild West Relay

Fri, Jul 31 · Fort Collins, CO Fort Collins

Wild West Relay - Get Your Ass Over the Pass - Super Ultra team (1-3 runners)Wild West Relay - Get Your Ass Over the Pass - 12 person team (7-12 runners)Wild West Relay - Get Your Ass Over the Pass - Ultra team (4-6 runners) +1

From $660 Open

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Flying Colors 5K Fun Run/Walk

Sat, Aug 1 · Craig, CO Craig

Road 5K Fun Run/Walk

From $30 Open

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Shootout for Soldiers Colorado

Sat, Aug 1 · Littleton, CO Littleton

Team RegistrationFull Field RegistrationPlayer Registration with Game Jersey

From $50 Open

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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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Popsicle 5K/10K/Half - Colorado Springs

Sat, Aug 1 · Colorado Springs, CO Colorado Springs

Virtual 5K-No Shirt5KVirtual 5K +6

From $25 Open

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Unicorn 5k (South)

Sat, Aug 1 · Highlands Ranch, CO Highlands Ranch

Road 5k Run/Walk3/4 (ish) Mile Saunter

From $13 Open

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Bound for Boston Marathon & Half Marathon - Denver

Sun, Aug 2 · Denver, CO Denver

Virtual Virtual Half MarathonHalf MarathonMarathon +1

From $25 Open

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Eltuck Valley 5K - Lory Summer Trail Series

Tue, Aug 4 · Fort Collins, CO Fort Collins

Road Eltuck Valley 5k

From $25 Open

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BRR All-Comers Summer Track & Field Series #5

Thu, Aug 6 · Boulder, CO Boulder

Road 100M200M400M +9

From $20 Open 15 spots left

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Eldorado Run for the Cure

Thu, Aug 6 · Eldorado Springs, CO Eldorado Springs

Road Eldorado Run for the Cure

From $30 Open

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RMRR August Trophy Series

Fri, Aug 7 · Centennial, CO Centennial

Road 5k

From $10 Open

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Eat. Run. Adopt. 10K

Sat, Aug 8 · Berthoud, CO Berthoud

Road 10KCHILD CARE

From $5 Open Closing Soon

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Dog Days Of Summer 2026

Sat, Aug 8 · Longmont, CO Longmont

Road Kidz DashDog Days of Summer 3.5 Loop

From $20 Open 25 spots left

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All-Out Runapalooza

Sat, Aug 8 · Arvada, CO Arvada

Virtual VIRTUAL 5K5K10K +3

From $25 Open

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HRCA Splash Mash Dash Kids Triathlon

Sat, Aug 8 · Littleton, CO Littleton

Triathlon Kids Triathlon

From $45 Open

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Arapahoe Warrior 5K

Sat, Aug 8 · Centennial, CO Centennial

Road Warrior 5K

From $25 Open

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Summer Sizzler- Denver

Sat, Aug 8 · Thornton, CO Thornton

Virtual 1 Mile5k10k +4

From $17 Open 5 spots left

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Summer Sizzler- Colorado Springs

Sun, Aug 9 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

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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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Run for PB& J 5K/10K/13.1 DENVER/AURORA

Sat, Aug 15 · Centennial, CO Centennial

Virtual Family 1 Mile Fun RunVirtual Run Registration5K Registration +3

From $30 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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Bagel Run 5K/10K/13.1 DENVER/AURORA

Sat, Aug 15 · Centennial, CO Centennial

Virtual Family Fun Run 1 MileVirtual Run Registration (5K/10K/13.1)5K Registration +3

From $30 Open

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Erie Half & 5k

Sun, Aug 16 · Erie, CO Erie

Road 5kHalf Marathon

From $30 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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CEROX IRON + IRON X

Sat, Aug 22 · Frederick, CO Frederick

Cerox Iron Teams of 2Cerox Iron IndividualCerox Iron X Individual +1

From $45 Open

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Ram Run

Sat, Aug 22 · Denver, CO Denver

Virtual Ram Run Kids Race (12 and under)Ram RunRam Run - Virtual

From $10 Open

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Byers Peak Stampede Half Marathon & 5K Run

Sat, Aug 22 · Fraser, CO Fraser

Road 5KHalf Marathon

From $45 Open

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