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.

Sierra's 5K Run/Walk Race Against Meningitis

Sat, Jun 20 · Loveland, CO Loveland

Road 5K RunKids Fun Run (10 & Under)

From $10 Open

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

Sat, Jun 20 · Centennial, CO Centennial

Virtual Family Fun Run 1 Mile5K RegistrationVirtual Run Registration (5K/10K/13.1) +3

From $30 Open

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Unicorn 5k (North)

Sat, Jun 20 · Thornton, CO Thornton

Road 1/2 (ish) Mile Saunter - untimed5k Run/Walk

From $16 Open

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Havoc at HartFit OCR 3k

Sat, Jun 20 · Peyton, CO Peyton

OCR KIDS HartFit HAVOC 1 MileHavoc at HartFit OCR 3k

From $29.99 Open 10 spots left

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Fatherhood 5k Family Run/Walk

Sat, Jun 20 · Colorado Springs, CO Colorado Springs

Road Family Pricing (Immediate Family)Adult 5kYouth 8-18 yrs

From $15 Open

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Freedom Tour Classic

Sat, Jun 20 · Fort Collins, CO Fort Collins

5K Walk15 Mile25 Mile w/T-shirt +3

From $25 Open

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Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Sat, Jun 20 · 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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Sunset Trail Running Festival

Sun, Jun 21 · Boulder, CO Boulder

Trail Kids 1K5K12K +1

From $15 Open

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Juneteenth Fun Run 5K

Sun, Jun 21 · Denver, CO Denver

Road 5KKids 5K

From $25 Open

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Father's Day Classic 10k, 5k, & 1 Mile

Sun, Jun 21 · Arvada, CO Arvada

Road 1 Mile Fun Run (untimed)Manly Mile (TIMED - for MEN Only)5k +3

From $8 Open

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14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Sun, Jun 21 · Boulder, CO Boulder

Road In-Person 5K Run/Walk

From $30 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 10KHighschool/Middle School Long Course (13 miles) +8

From $0 Open

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BRR All-Comers Summer Track & Field Series #2

Thu, Jun 25 · Boulder, CO Boulder

Road Steeplechase (3000 + 2000)100m200m +11

From $20 Open 15 spots left

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Before The Fourth 5k

Sat, Jun 27 · Littleton, CO Littleton

Road Before The Fourth 5k

From $35 Open

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Pearl Street Mile

Sat, Jun 27 · Boulder, CO Boulder

Road Pearl Street MileKids 800m

From $15 Open

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SBT TRL

Sat, Jun 27 · Steamboat Springs, CO Steamboat Springs

Road 5k10k

From $35.75 Open

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Denver Pride 5K

Sat, Jun 27 · Denver, CO Denver

Road Denver Pride 5K

From $40 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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Loveland Lake to Lake Triathlon

Sat, Jun 27 · Loveland, CO Loveland

Triathlon Relay - SprintRelay - OlympicAqua Bike - Olympic +5

From $110 Open

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Slacker Half Marathon-Relay-4-Mile Races

Sat, Jun 27 · Georgetown, CO Georgetown

Virtual 4 Mile - Military VeteranVirtual 4 Mile4-Mile +4

From $35 Open

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Blue Sky Ascent & Round Trip (formerly the Mt. Evans Ascent)

Sun, Jun 28 · Idaho Springs, CO Idaho Springs

Road AscentRound-Trip

From $125 Open 75 spots left

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Tunnel to Towers National Golf Series Northern Colorado Golf Classic

Mon, Jun 29 · Windsor, CO Windsor

Sponsorship: Gold Star SponsorSponsorship: First Responder SponsorSponsorship: Hero Sponsor +11

From $40 Open 1 spots left

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Denver Rotary Club Cycling to Serve 2026

Wed, Jul 1 · Denver, CO Denver

Open

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Run For Your Life 5K

Sat, Jul 4 · Meeker, CO Meeker

Road Run For Your Life 5K

From $20 Open

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

Sat, Jul 4 · Centennial, CO Centennial

Virtual Family 1 Mile Fun RunVirtual Run Registration5K Registration +3

From $30 Open

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Red, White, and WARRIOR 5K

Sat, Jul 4 · Grand Junction, CO Grand Junction

Road Red, White, and WARRIOR 5KLittle Sparkler Sprint

From $10 Open

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Durango Main Avenue Mile

Sat, Jul 4 · Durango, CO Durango

Road Main Avenue Mile

From $15.81 Open

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HRCA Independence Day 5K

Sat, Jul 4 · Littleton, CO Littleton

Road 5K Run/Walk

From $40 Open

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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

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Sheep Creek Triathlon

Sat, Jul 4 · Antonito, CO Antonito

Triathlon TriathlonShirt Purchase Only

From $20 Open

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4 Miles on the 4th

Sat, Jul 4 · Palmer Lake, CO Palmer Lake

Virtual July 4 Fun Run - Elementary Student and YoungerJuly 4 Fun Run - AdultJuly 4 Fun Run - Middle School and High School Student +3

From $20 Open

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Let Freedom Run 5k/10k - Louisville

Sat, Jul 4 · Louisville, CO Louisville

Road 5k10k

From $30 Open

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Greeley Freedom 5k Walk & Run

Sat, Jul 4 · Greeley, CO Greeley

Road 5k Walk5k Run

From $30 Open

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Pueblo's Firecracker 5k!

Sat, Jul 4 · Pueblo, CO Pueblo

Road Pueblo's Firecracker 5k!

From $19 Open

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

Sat, Jul 4 · Centennial, CO Centennial

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

From $30 Open

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Avery Brewing Co. 4K on the 4th

Sat, Jul 4 · Boulder, CO Boulder

Road Avery Brewing Co. 4K on the 4th

From $40 Open

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Loveland Liberty 5K

Sat, Jul 4 · Loveland, CO Loveland

Virtual 5KVirtual 5K

From $35 Open

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Let Freedom Run 5k - LONGMONT

Sat, Jul 4 · Longmont, CO Longmont

Road 5k Run/Walk

From $30 Open

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Independence Day Freedom 5K

Sat, Jul 4 · Buena Vista, CO Buena Vista

Road 3K5K

From $25 Open

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FireKracker 5k

Sat, Jul 4 · Fort Collins, CO Fort Collins

Road Kids 1-MileElite 5kFireKracker 5k

From $5 Open

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Hahns Peak Vertical Trail Race

Sun, Jul 5 · Clark, CO Clark

Road 8 Mile

From $40 Open

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BRR All-Comers Summer Track & Field Series #3

Thu, Jul 9 · Boulder, CO Boulder

Road 5000m100M200M +10

From $20 Open 15 spots left

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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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Heatwave Half Marathon - Denver

Sat, Jul 11 · Denver, CO Denver

Virtual 1 Mile5 K10 K +5

From $17 Open 5 spots left

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All-Out Dog Days

Sat, Jul 11 · Westminster, CO Westminster

Virtual 5KVIRTUAL 5K10K +3

From $25 Open Closing Soon

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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

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Pagosa Duathlon

Sat, Jul 11 · Pagosa Springs, CO Pagosa Springs

Triathlon Dusty KidsDirty SprintDirty Du

From $15 Open

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Cookie Chase

Sat, Jul 11 · Denver, CO Denver

Road 5KVirtual 5K

From $30 Open

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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

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Heatwave Half Marathon - Colorado Springs

Sun, Jul 12 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5 K10 K +5

From $17 Open 5 spots left

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