Running Races in Colorado — 2026

There are 422 running races in Colorado in 2026 across 109 cities. The next upcoming race is the Middle School San Juan Basin League Meet in Ridgway on April 24. Popular distances include 5K races, trail runs, half marathons.

Flyin' Ryan Memorial 5k

Fri, Jul 24 · Loveland, CO Loveland

Road Flyin' Ryan Memorial 5k

From $25 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

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2nd Annual Pancreatic Cancer Awareness in Honor of Diana Cantu - 5K Fun Run/Walk

Sat, Jul 25 · Alamosa, CO Alamosa

Road 5k Run/walk - 18 & Over5k Run/walk - 16 & Under

From $18 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 Run5K Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

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CEROX + IRON

Sat, Jul 25 · Frederick, CO Frederick

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

From $45 Open

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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 RegistrationVirtual Run Registration (5K/10K/13.1) +3

From $30 Open

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The Hero's Journey 5K

Sat, Jul 25 · Aurora, CO Aurora

Virtual Kids Fun Run5K (21 and older)Virtual 5K +1

From $10 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 - 12 person team (7-12 runners)Wild West Relay - Get Your Ass Over the Pass - Ultra team (4-6 runners)Wild West Relay - Get Your Ass Over the Pass - Super Ultra team (1-3 runners) +1

From $660 Open Closing Soon

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Shootout for Soldiers Colorado

Sat, Aug 1 · Littleton, CO Littleton

Full Field RegistrationTeam RegistrationPlayer Registration with Game Jersey

From $50 Open

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Popsicle 5K/10K/Half - Colorado Springs

Sat, Aug 1 · Colorado Springs, CO Colorado Springs

Virtual 5K-No ShirtVirtual 5K5K +6

From $25 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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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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Sheep Mountain Trail Runs

Sat, Aug 1 · Fairplay, CO Fairplay

Trail Half Marathon50k50-Mile

From $70 Open Closing Soon

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Kennebec Mountain Run

Sat, Aug 1 · Hesperus, CO Hesperus

Trail 15 Mile

From $75 Open

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Bound for Boston Marathon & Half Marathon - Denver

Sun, Aug 2 · Denver, CO Denver

Virtual Half MarathonVirtual Half 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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Arapahoe Warrior 5K

Sat, Aug 8 · Centennial, CO Centennial

Road Warrior 5K

From $25 Open

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Eat. Run. Adopt. 10K

Sat, Aug 8 · Berthoud, CO Berthoud

Road 10KCHILD CARE

From $5 Open

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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 5KVIRTUAL 5KVIRTUAL 10K +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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Summer Sizzler- Denver

Sat, Aug 8 · Thornton, CO Thornton

Virtual 1 Mile5k10k +4

From $17 Open Closing Soon 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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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/10K/13.1 Eco-Registration (No Shirt) +3

From $30 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 Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run 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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Staunton Rocks! Marathon and Half Marathon

Sat, Aug 22 · Pine, CO Pine

Road Staunton Rocks! Half MarathonStaunton Rocks! Marathon

From $90 Open

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Ram Run

Sat, Aug 22 · Denver, CO Denver

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

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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CEROX IRON + IRON X

Sat, Aug 22 · Frederick, CO Frederick

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

From $45 Open

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Gunnison Valley Triathlon

Sat, Aug 22 · Gunnison, CO Gunnison

Triathlon Sprint TriathlonTeam RelayKids Triathlon +1

From $25 Open

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Rebel Run 5k

Sun, Aug 23 · Denver, CO Denver

Virtual 5k Walk5k Run5k Virtual Race

From $10 Open

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Pioneer Prairie Dog Half, 10k & 5k

Sun, Aug 23 · Westminster, CO Westminster

Road 5k10kHalf Marathon

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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TBK Bank Thirsty 13 Half Marathon

Sat, Aug 29 · Durango, CO Durango

Road Just The Race -- No Brewfest TicketRace Plus Brewfest

From $85 Open

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Rocky Mountain 5K presented by School District 11

Sat, Aug 29 · Colorado Springs, CO Colorado Springs

Road Rocky Mountain 5K

From $35 Open

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Sloth Run 5K/10K/13.1 DENVER/AURORA

Sat, Aug 29 · Centennial, CO Centennial

Virtual Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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RexRun For PAWSitivity 2026 Trail Run/Walk

Sat, Aug 29 · Aurora, CO Aurora

Road Kids 1-mile Run/Walk5K Trail RunFamily 5K Trail Walk

From $20 Open

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Run Like the Wind 5k / 2k / Dog Jog

Sat, Aug 29 · Allenspark, CO Allenspark

Road 2k Run / Walk5K Run

From $20 Open

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Run to Breast Cancer 5K/10K/13.1 DENVER/AURORA

Sat, Aug 29 · Centennial, CO Centennial

Virtual Family Fun Run 1 Mile5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration (5K/10K/13.1) +3

From $30 Open

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Run for Hope - Colorado Springs

Sat, Aug 29 · Colorado Springs, CO Colorado Springs

Virtual Memorial Mile5K Run/WalkVirtual Race

From $25 Open

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Wine Run 5k at The Winery at Holy Cross Abbey

Sun, Aug 30 · Canon City, CO Canon City

Road 5kVolunteer and Run 8:00am to 9:30amVolunteer with check-in 9:30am-11:00am then Run

From $15 Open 5 spots left

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