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.

Cirque Series - Arapahoe Basin, CO

Sat, Sep 5 · Keystone, CO Keystone

Trail Expert DivisionPro DivisionSport Division (beginner / intermediate)

From $90.15 Open

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Golden Harvest Half Marathon & 5k/10k - Denver

Sat, Sep 5 · Denver, CO Denver

Virtual 1 Mile5k10k +4

From $17 Open 5 spots left

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Raising the Barr

Sat, Sep 5 · Brighton, CO Brighton

Road 12 Hour - Relay STANDARD (4-8 people)12 hour - Solo12 hour - Relay ULTRA (2-3 people) +3

From $55 Open

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South Fork Alder Ass Race

Sat, Sep 5 · South Fork, CO South Fork

Virtual Alder Ass Race Mini CourseAlder Ass Race Standard CourseGhost Runners

From $40 Open

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Golden Harvest Half Marathon & 5k/10k - Colorado Springs

Sun, Sep 6 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

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10k at 10,000 Feet

Sun, Sep 6 · Steamboat Springs, CO Steamboat Springs

Road 5k10k

From $25 Open

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Labor Day Half Marathon

Mon, Sep 7 · Parker, CO Parker

Road 5K10KHalf Marathon +1

From $27 Open Closing Soon

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Oak Creek No Fun Run

Mon, Sep 7 · Oak Creek, CO Oak Creek

Road 5K

From $25 Open

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Flaming Foliage Relay - Idaho Springs to Buena Vista

Fri, Sep 11 · Idaho Springs, CO Idaho Springs

Flaming Foliage Relay - Super Ultra (1-3 runners)Flaming Foliage Relay - 10 person Team (6-10 runners)Flaming Foliage Relay - Ultra Team (4-5 Runners)

From $623 Open

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The Denver 5k

Sat, Sep 12 · Denver, CO Denver

Road 5kFREE Kids Fun Run

From $0 Open

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Steele Trap Trail Run

Sat, Sep 12 · Loma, CO Loma

Road Steele Trap Trail Run

From $50 Open

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2026 Lake Nighthorse Triathlon - Sprint and Olympic

Sat, Sep 12 · Durango, CO Durango

Triathlon Sprint Relay - MaleSprint Relay - FemaleSprint Relay - Coed +2

From $85 Open Closing Soon

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

Sat, Sep 12 · 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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Black Squirrel Half Marathon

Sat, Sep 12 · Bellvue, CO Bellvue

Road Black Squirrel Half Marathon

From $90 Open

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For The City Network 5K

Sat, Sep 12 · Greeley, CO Greeley

Road For The City Network 5K

From $45 Open

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Break Your Neck: Walk, Run, or Roll

Sat, Sep 12 · Pueblo, CO Pueblo

Open

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Spirit of the Valley 5k

Sat, Sep 12 · Grand Junction, CO Grand Junction

Road 5k Run5K Roll1K Run +1

From $10 Open

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National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA

Sat, Sep 12 · 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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6 Dot Dash

Sat, Sep 12 · Littleton, CO Littleton

Virtual 5KVirtual 5K

From $40 Open

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Trail Sisters Women's Half Marathon & 10k

Sat, Sep 12 · Buena Vista, CO Buena Vista

Trail Trail Sisters Women's 10kTrail Sisters Women's Half Marathon

From $55 Open

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RMRR September Trophy Series

Sun, Sep 13 · Thornton, CO Thornton

Road 5k10k

From $10 Open

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Colorado Run for the Fallen Run/Walk/Ruck

Sun, Sep 13 · Palmer Lake, CO Palmer Lake

Road Run/Walk to RememberRuck to Remember

From $35 Open

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Tiger Prowl 5K

Sun, Sep 13 · Denver, CO Denver

Road Tiger Prowl 5K Fun Run/WalkTiger Prowl Youth 5K---register your 12 and under child here*Tiger Prowl 5K Chill Option

From $15 Open

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Honey Bee Hustle

Sun, Sep 13 · Loveland, CO Loveland

Road ChallengeMini Honey Bee Hustle

From $15 Open

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Severance Glow 5K Run or Walk

Fri, Sep 18 · Severance, CO Severance

Road Severance Glow 5K

From $30 Open

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Beulah Challenge and OverIt Series

Sat, Sep 19 · Beulah, CO Beulah

Road 5K - Age 17 & Under5K10K +3

From $20 Open

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Wellington STAR Foundation 5K 10K

Sat, Sep 19 · Wellington, CO Wellington

Road Stroller or Dog 5KKids 5K (ages 3-12)5K Run +3

From $10 Open

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All-Out Fall Fest

Sat, Sep 19 · Westminster, CO Westminster

Virtual VIRTUAL 5K5K10K +3

From $25 Open

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Lederhosen Race 2026

Sat, Sep 19 · Red Feather Lakes, CO Red Feather Lakes

Road Lederhosen Fun Run

From $35 Open

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Autumn Run

Sat, Sep 19 · Buena Vista, CO Buena Vista

Road 5K10KHalf Marathon

From $30 Open

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Battle by the Brook

Sat, Sep 19 · Deckers, CO Deckers

Family RaceCompetitive Race

From $89 Open 75 spots left

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Pikes Peak Ascent

Sat, Sep 19 · Manitou Springs, CO Manitou Springs

Road Half Priced Award EntryAscent

From $87.5 Open

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Pikes Peak Marathon

Sun, Sep 20 · Manitou Springs, CO Manitou Springs

Road Half Priced Award EntryMarathon

From $100 Open

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Chile & Frijole Hot to Trot 5K & 10K

Sun, Sep 20 · Pueblo, CO Pueblo

Road 5K Run10K Run

From $35 Open

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20th Annual Golden Gallop

Sun, Sep 20 · Golden, CO Golden

Road 5K10K20K Challenge - ONLY 10K completed on race day, remaining 10K done virtually +2

From $25 Open

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Fall Equinox

Sun, Sep 20 · Fort Collins, CO Fort Collins

Virtual Virtual 5 Mile5 MileHalf Marathon +1

From $50 Open

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7th ANNUAL PAUL'S MYSTERY SHIP WALK TO END ALS

Sun, Sep 20 · Castle Rock, CO Castle Rock

7th ANNUAL PAUL'S MYSTERY SHIP WALK TO END ALS

From $45 Open

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Farmers 5000

Sun, Sep 20 · Wheat Ridge, CO Wheat Ridge

Virtual Adult 5K RegistrationAlumni 5K RegistrationHigh School Student and Staff 5K Registration. T-shirt included in registration. +4

From $10 Open

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CG Adventure Club - Elevation Everest

Wed, Sep 23 · Winter Park, CO Winter Park

All-In Adventure PackageBasic Experience PackageStarter Adventure Package

From $150 Open

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Red Feather Trail Jamboree

Fri, Sep 25 · Red Feather Lakes, CO Red Feather Lakes

Trail Red Feather Trail Jamboree Half MarathonRed Feather Trail Jamboree 50 MileRed Feather Trail Jamboree 50km +1

From $90 Open Closing Soon

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HRCA Oktoberfest 5K

Sat, Sep 26 · Littleton, CO Littleton

Road 5K Run/Walk

From $40 Open

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Estes Epic

Sat, Sep 26 · Estes Park, CO Estes Park

Trail Heavy Half Marathon50k Bike50k Run +1

From $80 Open

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25th Annual Black Canyon Triathlon

Sat, Sep 26 · Montrose, CO Montrose

Triathlon Adult Individual Triathlon Entry2-3 Person Family Team Relay2-3 Person Adult Team Triathlon Entry +2

From $20 Open

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

Sat, Sep 26 · 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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Sangre de Cristo Trail Festival

Sat, Sep 26 · Westcliffe, CO Westcliffe

Trail 8-Mile27k50k +3

From $40 Open

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Parker Parks and Recreation So Long to Summer 5K/10K

Sat, Sep 26 · Parker, CO Parker

Road 5K10K

From $40 Open 100 spots left

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NIGHT NATION RUN - DENVER

Sat, Sep 26 · Commerce City, CO Commerce City

Road VIP REGISTRATIONPREMIUM REGISTRATIONSTANDARD REGISTRATION

From $35 Open

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

Sat, Sep 26 · 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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Runway 5K - Run for the Angels

Sat, Sep 26 · Broomfield, CO Broomfield

Virtual In-Person Runway 5K - Run or Walk - September 26Virtual Runway 5K - Run, Walk, Fly | September 29 - October 4

From $25 Open

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West Line Winder

Sat, Sep 26 · Buena Vista, CO Buena Vista

Trail 50k30k

From $105 Open

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