Running Races in Colorado — 2026

There are 275 running races in Colorado in 2026 across 74 cities. The next upcoming race is the DU Crimson Classic 5K Run/1.5 Mile Walk in Denver on October 21. Popular distances include 5K races, half marathons, ultras.

DU Crimson Classic 5K Run/1.5 Mile Walk

Wed, Oct 21 · Denver, CO Denver

Road Volunteer One Hour - Day of Crimson Classic

From $0 Open Closing Soon

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Fall Skyline Traverse

Sat, Oct 24 · Boulder, CO Boulder

Road Fall Skyline Traverse

From $25 Open Closing Soon 100 spots left

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Mancos Cowboy Half Marathon, 5K, and Fun Run

Sat, Oct 24 · Mancos, CO Mancos

Road Mancos 5KMancos Cowboy Half Marathon

From $25 Open Closing Soon 74 spots left

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YMCA Creepy Crawl 5K presented by Corwin Honda

Sat, Oct 24 · Palmer Lake, CO Palmer Lake

Road Creepy Crawl 5K

From $40 Open Closing Soon

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Apex Foundation Trick or Trot 5K & Halloween Hunt Powered by REP Fitness

Sat, Oct 24 · Arvada, CO Arvada

Virtual Kids' 1-mile Halloween Hunt powered by REP FitnessTrick or Trot VIRTUAL 5K powered by REP FitnessTrick or Trot 5K powered by REP Fitness

From $10 Open Closing Soon

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Hoofin' It Through the Hollows 5K

Sat, Oct 24 · Centennial, CO Centennial

Road 5K

From $15 Open Closing Soon

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Zedikiah Scholarship 5K

Sat, Oct 24 · Denver, CO Denver

Open Closing Soon

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2026 World Run Day Virtual 5K - Lakewood

Sat, Oct 24 · Lakewood, CO Lakewood

Virtual 5K

From $19.99 Open Closing Soon

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2026 World Run Day Virtual 5K - Fort Collins

Sat, Oct 24 · Fort Collins, CO Fort Collins

Virtual 5K

From $19.99 Open Closing Soon

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2026 World Run Day Virtual 5K - Denver

Sat, Oct 24 · Denver, CO Denver

Virtual 5K

From $19.99 Open Closing Soon

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Race to Cure Sarcoma Denver

Sat, Oct 24 · Denver, CO Denver

Virtual 5K Run or 1 Mile Walk (Untimed) - Adult5K Run or 1 Mile Walk (Untimed) - Child (Ages 6-12)5K Run (Timed) - Adult +3

From $10 Open Closing Soon

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2026 World Run Day Virtual 5K - Boulder

Sat, Oct 24 · Boulder, CO Boulder

Virtual 5K

From $19.99 Open Closing Soon

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2026 World Run Day Virtual 5K - Colorado Springs

Sat, Oct 24 · Colorado Springs, CO Colorado Springs

Virtual 5K

From $19.99 Open Closing Soon

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2026 World Run Day Virtual 5K - Aurora

Sat, Oct 24 · Aurora, CO Aurora

Virtual 5K

From $19.99 Open Closing Soon

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Paws for Life Fun Run/Walk 5K - Sponsored by Imperial Memorial Gardens

Sat, Oct 24 · Pueblo, CO Pueblo

Open Closing Soon

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McGraw Memorial Park "Quick Draw @ McGraw" 2.1 & 12.6 Mile Trail Races

Sat, Oct 24 · Bailey, CO Bailey

Trail 2 Mile *VIRTUAL* Trail Run/ Walk2 Mile Trail Run2 Mile Trail Walk or Walk/Run +1

From $25 Open Closing Soon

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Ghosts and Goblins 5K/10K

Sun, Oct 25 · Denver, CO Denver

Road Virtual Race5K10K

From $30 Open Closing Soon

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Fleet Feet Colorado Springs Halloween Fun Run

Fri, Oct 30 · Colorado Springs, CO Colorado Springs

Open Closing Soon

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Turkey Trot

Sat, Oct 31 · Center, CO Center

Virtual 2026 Turkey Trot Virtual2027 Turkey TrotPie Eating Contest!

From $5 Open

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HRCA Backcountry Wilderness Half Marathon

Sat, Oct 31 · Lone Tree, CO Lone Tree

Trail Half Marathon

From $65 Open Closing Soon

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Colleen De Reuck XC Classic

Sat, Oct 31 · Boulder, CO Boulder

Road 1K XC - 10 Years & Under3K XC - 16 Years & Under5K XC - Open

From $15 Open Closing Soon

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Halloween 5K Fundraiser!

Sat, Oct 31 · Grand Junction, CO Grand Junction

Road 5K Run

From $0 Open Closing Soon

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Halloween Fun 5k

Sat, Oct 31 · Steamboat Springs, CO Steamboat Springs

Road Fun 5K

From $25.75 Open Closing Soon

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I Ain't Scared (of 5k)

Sat, Oct 31 · Thornton, CO Thornton

Road 5k

From $29 Open Closing Soon

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Spooky Sprint - Colorado Springs

Sat, Oct 31 · Colorado Springs, CO Colorado Springs

Virtual 5k10KSpooky Sprint Half Marathon 2027 +7

From $17 Open Closing Soon 5 spots left

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Zombie Fun Run 5k & 1mile

Sat, Oct 31 · Idaho Springs, CO Idaho Springs

Road 1 Mile Fun RunZombie Fun Run

From $25 Open Closing Soon

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Fossil Creek Park T&H 5K

Sun, Nov 1 · Fort Collins, CO Fort Collins

Open Closing Soon

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RMRR November 5k/15k

Sun, Nov 1 · Denver, CO Denver

Road 5k15k

From $10 Open Closing Soon

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All-Out Kooky-Spooky

Sun, Nov 1 · Golden, CO Golden

Virtual 5KVIRTUAL 5K10K +3

From $20 Open Closing Soon

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Girls on the Run Northern Colorado Fall 5K

Sun, Nov 1 · Fort Collins, CO Fort Collins

Road Girls on the Run Northern Colorado Fall 5K

From $29 Open Closing Soon

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Feet for Justice Run

Sun, Nov 1 · Denver, CO Denver

Road Virtual Runner5K10K +1

From $10 Open Closing Soon

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Excel Eagle Trot 5K/1K Family Fun Run

Sat, Nov 7 · Arvada, CO Arvada

Virtual 1K5KSleep In

From $25 Open Closing Soon

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City Park Classic (5k/10k & 1 Mile Walk of Hope for Pancreatic Cancer Research)

Sat, Nov 7 · Denver, CO Denver

Road 1 Mile (ish) Walk of Hope (untimed)5k Run/Walk10k Run

From $16 Open Closing Soon

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Colorado 24 Hour Run

Sat, Nov 7 · Fort Collins, CO Fort Collins

Road 6 Hour6 Hour Relay12 Hour +3

From $90 Open Closing Soon

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Break a Leg 5k

Sat, Nov 7 · Grand Junction, CO Grand Junction

Road 1k Costume Parade5k Fundraiser Run

From $30 Open

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Alamosa Veterans Memorial Park Race

Sat, Nov 7 · Alamosa, CO Alamosa

Road Alamosa Veterans Memorial Park 10kAlamosa Veterans Memorial Park 5k

From $20 Open

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BSBF 2- Mile Fun Run - Bell Ringer

Sat, Nov 7 · Loveland, CO Loveland

Road 2 Mile BSBF Run

From $15 Open

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Nielson Challenge

Sat, Nov 7 · Colorado Springs, CO Colorado Springs

Open

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Turkey Trails- Denver

Sat, Nov 7 · Littleton, CO Littleton

Virtual 1 Mile5K10K +7

From $17 Open 5 spots left

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Bell Ringer 2 Miler

Sat, Nov 7 · Loveland, CO Loveland

Virtual Bell Ringer 2 MilerVirtual 2 MilerRuck Division

From $20 Open

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12th edition Sole Mates 5k & Brew Fest presented by Shoes & Brews and Left Hand Brewing

Sat, Nov 7 · Longmont, CO Longmont

Road GENERAL/OPEN 5k (Over 22 minute finish time) 12th Edition Sole Mates 5k & Hoppy HourELITE 5k (Under 22 minute finish time) 12th edition Sole Mates 5k & Hoppy HourBREW FEST DRINK PARTICIPANT ONLY

From $40 Open 100 spots left

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Canya Cañon Trail Race & Hike

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Road 4 Mile Course2.5 Mile Course

From $25 Open

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Dragon Dash 5K Run/Walk

Sun, Nov 8 · Denver, CO Denver

Road Dragon Dash 5K Run/Walk

From $30 Open

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Turkey Trails - Colorado Springs

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5KGirls on the Run - 5k +8

From $17 Open Closing Soon 5 spots left

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Friday The 13K - Castle Rock MEET UP

Fri, Nov 13 · Castle Rock, CO Castle Rock

Virtual 6.5 K13K

From $35 Open

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Lone Tree Reckoning Heavy 15K and 5K

Sat, Nov 14 · Loveland, CO Loveland

Trail Heavy 15K5K

From $45 Open Closing Soon

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Denver Veterans Day Run

Sat, Nov 14 · Denver, CO Denver

Road 5K Run/Walk10K Rippetoe Rucksack Challenge10K Run/Walk

From $45 Open

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Leyden Rock Turkey Trot 5K

Sat, Nov 14 · Arvada, CO Arvada

Road 5K

From $10 Open

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Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Sat, Nov 14 · 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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Colorado State Youth Cross Country Championships

Sat, Nov 14 · Aurora, CO Aurora

Road Girls 8 & Under (Born 2018+) - 2KM (1.24 Miles)Boys 8 & Under (Born 2018+) - 2KM (1.24 Miles)Girls 9 & 10 (Born 2016-2017) - 3K (1.86 Miles) +5

From $25.99 Open

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