Running Races in Colorado — 2026

There are 386 running races in Colorado in 2026 across 99 cities. The next upcoming race is the HRCA Happy Hour Half K in Littleton on June 19. Popular distances include 5K races, trail runs, half marathons.

July 4th Run 5K/10K/13.1 DENVER/AURORA

Sat, Jul 4 · Centennial, CO Centennial

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

From $30 Open

Register →

Greeley Freedom 5k Walk & Run

Sat, Jul 4 · Greeley, CO Greeley

Road 5k Walk5k Run

From $30 Open

Register →

Independence Day Freedom 5K

Sat, Jul 4 · Buena Vista, CO Buena Vista

Road 3K5K

From $25 Open

Register →

Let Freedom Run 5k/10k - Louisville

Sat, Jul 4 · Louisville, CO Louisville

Road 5k10k

From $30 Open

Register →

Avery Brewing Co. 4K on the 4th

Sat, Jul 4 · Boulder, CO Boulder

Road Avery Brewing Co. 4K on the 4th

From $40 Open Closing Soon

Register →

Run For Your Life 5K

Sat, Jul 4 · Meeker, CO Meeker

Road Run For Your Life 5K

From $20 Open

Register →

6th Annual July 4th ROCK-IT RUN

Sat, Jul 4 · Castle Rock, CO Castle Rock

Road 5kHalf Marathon

From $43 Open Closing Soon

Register →

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

Sat, Jul 4 · Centennial, CO Centennial

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

From $30 Open

Register →

Red Feather Lakes 3.6 Mile Fun Run

Sat, Jul 4 · Red Feather Lakes, CO Red Feather Lakes

Road Red Feather Lakes 3.6 Mile Fun Run

From $40 Open

Register →

Palmer Lake July 4th Fun Run

Sat, Jul 4 · Palmer Lake, CO Palmer Lake

Virtual July 4 Fun Run - AdultJuly 4 Fun Run - VIRTUAL RACE - Middle School and High School StudentJuly 4 Fun Run - VIRTUAL RACE Elementary Student and Younger +3

From $20 Open

Register →

Loveland Liberty 5K

Sat, Jul 4 · Loveland, CO Loveland

Virtual 5KVirtual 5K

From $35 Open 1 spots left

Register →

Sheep Creek Triathlon

Sat, Jul 4 · Antonito, CO Antonito

Triathlon TriathlonShirt Purchase Only

From $20 Open Closing Soon

Register →

FireKracker 5k

Sat, Jul 4 · Fort Collins, CO Fort Collins

Road Kids 1-MileElite 5kFireKracker 5k

From $5 Open

Register →

Rendezvous Run for Independence

Sat, Jul 4 · Winter Park, CO Winter Park

Road Rendezvous Run for Independence 5K Run/Walk

From $40 Open

Register →

Hahns Peak Vertical Trail Race

Sun, Jul 5 · Clark, CO Clark

Road 8 Mile

From $40 Open

Register →

BRR All-Comers Summer Track & Field Series #3

Thu, Jul 9 · Boulder, CO Boulder

Road 5000m100M200M +10

From $20 Open 15 spots left

Register →

Silverheels Trail Runs

Fri, Jul 10 · Como, CO Como

Trail 10-Mile19-Mile60k +3

From $50 Open

Register →

Cookie Chase

Sat, Jul 11 · Denver, CO Denver

Road Virtual 5K5K

From $30 Open

Register →

DRMABPsi 1–5K Walk, Run & Roll

Sat, Jul 11 · Denver, CO Denver

Road 1k2kKids Run +3

From $10 Open Closing Soon

Register →

Pagosa Duathlon

Sat, Jul 11 · Pagosa Springs, CO Pagosa Springs

Triathlon Dusty KidsDirty SprintDirty Du

From $15 Open

Register →

Paint the Prairie

Sat, Jul 11 · Aurora, CO Aurora

Paint the Prairie Color Run

From $15 Open Closing Soon

Register →

All-Out Dog Days

Sat, Jul 11 · Westminster, CO Westminster

Virtual VIRTUAL 5K5K10K +3

From $20 Open Closing Soon

Register →

Heatwave Half Marathon - Denver

Sat, Jul 11 · Littleton, CO Littleton

Virtual 1 Mile5K10K +5

From $17 Open Closing Soon 5 spots left

Register →

Grin & Bear It

Sat, Jul 11 · Crested Butte, CO Crested Butte

Road 15 km Out and BackMountain Bike25 km Loop

From $75 Open 75 spots left

Register →

Rocky Mountain State Games - Swim / Run

Sun, Jul 12 · Colorado Springs, CO Colorado Springs

Triathlon Swim / Run - 5-8yrsSwim / Run - 9-15yrsSwim / Run - 16+ yrs

From $25 Open

Register →

Surf and Turf Triathlon

Sun, Jul 12 · Aurora, CO Aurora

Triathlon Surf and Turf Super Sprint TriathlonSurf and Turf Sprint Triathlon

From $75 Open

Register →

RMRR July 2mi & pancake breakfast

Sun, Jul 12 · Lakewood, CO Lakewood

Road 2mi

From $10 Open

Register →

Heatwave Half Marathon - Colorado Springs

Sun, Jul 12 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5 K10 K +5

From $17 Open Closing Soon 5 spots left

Register →

PNAAF 5K Wellness Challenge

Thu, Jul 16 · Colorado Springs, CO Colorado Springs

Virtual Virtual 5KPNAAF 5K Wellness Challenge

From $35 Open

Register →

High Lonesome 100

Fri, Jul 17 · Nathrop, CO Nathrop

Ultra 100 Miler

From $465 Open

Register →

Heritage Eagles 5K

Sat, Jul 18 · Littleton, CO Littleton

Road Heritage Eagles 5K

From $25 Open

Register →

Spring Creek Memorial Trail Run

Sat, Jul 18 · Steamboat Springs, CO Steamboat Springs

Road 5k9.5 Mile

From $25.75 Open 100 spots left

Register →

Parker Parks and Recreation Kids' TRY-athlon

Sat, Jul 18 · Parker, CO Parker

Triathlon 6 to 7 years8 to 10 years11 to 12 years

From $35 Open 35 spots left

Register →

Expedition Maroon Bells

Sat, Jul 18 · Aspen, CO Aspen

Freedom Expedition Leadership TeamFreedom Expedition DepositFreedom Expedition

From $0 Open 6 spots left

Register →

Denver, CO Galloway Training Program

Sat, Jul 18 · Denver, CO Denver

Road New Member - Half Marathon TrainingNew Member - MarathonAlumni Club - Galloway Member for at least 2 previous years +2

From $91 Open

Register →

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 5 and Under5K Fun Run and Doggie Dash - Youth Racer 6-12

From $0 Open

Register →

TransRockies Run Charity Bibs

Sat, Jul 18 · Buena Vista, CO Buena Vista

Trail Individual Fundraiser Charity Bib

From $0 Open Closing Soon 3 spots left

Register →

Audi Power of Four Trail Run

Sat, Jul 18 · Aspen, CO Aspen

Trail 10K Run25K Run50K Run

From $105 Open Closing Soon 75 spots left

Register →

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

Sat, Jul 18 · Castle Rock, CO Castle Rock

Road 5k10kHalf Marathon

From $25 Open

Register →

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

Register →

CU Anschutz Run Club 5K

Sat, Jul 18 · Aurora, CO Aurora

Road 5K without T-Shirt5K with T-Shirt

From $7 Open Closing Soon

Register →

Barr Trail Mountain Race

Sun, Jul 19 · Manitou Springs, CO Manitou Springs

Road BTMRAid Station Challenge Sponsor

From $75 Open 16 spots left

Register →

One Is Too Many: Veteran Suicide Awareness 5k and Kids Run

Sun, Jul 19 · Greeley, CO Greeley

Road 1 Mile5k run or walk

From $15 Open

Register →

Clear for Takeoff Virtual 5K

Mon, Jul 20 · Colorado Springs, CO Colorado Springs

Virtual Clear for Takeoff Virtual 5K

From $35 Open

Register →

14er Challenge

Thu, Jul 23 · Buena Vista, CO Buena Vista

14er Challenge 2026

From $249 Open Closing Soon 25 spots left

Register →

BRR All-Comers Summer Track & Field Series #4

Thu, Jul 23 · Boulder, CO Boulder

Road 100M200M400M +10

From $20 Open 15 spots left

Register →

Flyin' Ryan Memorial 5k

Fri, Jul 24 · Loveland, CO Loveland

Road Flyin' Ryan Memorial 5k

From $25 Open

Register →

Never Summer 100km & 60km

Fri, Jul 24 · Walden, CO Walden

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

From $175 Open 20 spots left

Register →

Aspen Valley Marathon

Sat, Jul 25 · Aspen, CO Aspen

Road Aspen Valley Marathon 5KAspen Valley HALF MarathonAspen Valley Marathon

From $55 Open

Register →

Beas Knees Citizens' Race and National High School Trail Championships

Sat, Jul 25 · Salida, CO Salida

Trail Girls' National ChampionshipBoys' National ChampionshipBeas Knees Citizens' Race

From $25 Open

Register →