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.

14er Fest 14K & 5K

Sun, Sep 27 · Buena Vista, CO Buena Vista

Road 5K14K

From $35 Open

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Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

Sun, Sep 27 · Boulder, CO Boulder

Virtual 5K (Virtual)10K (Virtual)1/2 Marathon (In-Person) +1

From $40 Open

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Sawatch Ascent

Sun, Sep 27 · Nathrop, CO Nathrop

Ultra 50k

From $129 Open

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Colorado Coyotes Youth XC Invitational

Sun, Sep 27 · Cenennial, CO Cenennial

Road Ages 8 & Under (born 2017+) - 2Km (1.24 miles)Ages 9 &10 (born 2015-2014) - 3Km (1.86 miles)Ages 11&12 - (born 2013-2014) - 3Km (1.86 miles) +1

From $30 Open

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Joy & Justice 5k

Sun, Sep 27 · Timnath, CO Timnath

Virtual Kids 1 mile Fun Run (12 & Under)Joy & Justice 5k WalkVirtual 5k +1

From $15 Open

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I Can 5k

Sat, Oct 3 · Thornton, CO Thornton

Open

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HRCA Wildcat Mountain Trail Races

Sat, Oct 3 · Littleton, CO Littleton

Trail 10M10KKid's Race

From $10 Open

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Emerald Mountain Trail Run

Sat, Oct 3 · Steamboat Springs, CO Steamboat Springs

Road 4 Mile12k

From $25.75 Open

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Lafayette Music Fest -5K - 10K

Sat, Oct 3 · Lafayette, CO Lafayette

Road 5K10K

From $40 Open Closing Soon

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Splashland Triathlon

Sat, Oct 3 · Alamosa, CO Alamosa

Triathlon Individual Triathlon Entry2 Person Team Triathlon Entry3 Person Team Triathlon Entry

From $70 Open

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Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon

Sat, Oct 3 · Canon City, CO Canon City

Virtual VIRTUAL 5k Run/Walk5K Road Run8 Mile Trail Run +3

From $40 Open

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Spooky Sprint - Denver

Sat, Oct 3 · Denver, CO Denver

Virtual 1 Mile5K10K +4

From $20 Open 5 spots left

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Colorado Springs Marathon, Half, 5K, and Kids K

Sat, Oct 3 · Colorado Springs, CO Colorado Springs

Virtual Kids KVirtual Kids K2027 Colorado Springs 5K +16

From $0 Open 20 spots left

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Homecoming 5K - Colorado State University

Sat, Oct 3 · Fort Collins, CO Fort Collins

Virtual Homecoming 5K5K CSU Alumni5K CSU Student +2

From $25 Open

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Rubey Rescue Run

Sun, Oct 4 · Aspen, CO Aspen

Trail 3.1M Trail Run

From $60.38 Open

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OTILLO Swimrun Colorado

Sun, Oct 4 · Fort Collins, CO Fort Collins

Triathlon Sprint SoloSprint TeamWorld Series Solo +3

From $70 Open Closing Soon

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Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Sun, Oct 4 · Windsor, CO Windsor

Road 1 Mile Fit & Fun Run5K10K +2

From $20 Open

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RMRR October Trophy Series

Sun, Oct 4 · Aurora, CO Aurora

Road 5k8mi

From $10 Open

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Dialysis Dash 5K

Sat, Oct 10 · Grand Junction, CO Grand Junction

Road 5K Dialysis Dash Run

From $20 Open

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Breckenridge RunFest

Sat, Oct 10 · Breckenridge, CO Breckenridge

Road Kids & Family Mile5K10K +2

From $25 Open

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Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA

Sat, Oct 10 · 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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The Long View Marathon

Sat, Oct 10 · Fort Collins, CO Fort Collins

Road The Long View 5kThe Long View Half MarathonThe Long View Marathon

From $35 Open

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

Sat, Oct 10 · 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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Durango Marathon

Sun, Oct 11 · Durango, CO Durango

Road Durango Half MarathonDurango MarathonDurango Marathon Weekend 5k

From $20 Open

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Westy Half & 5k

Sun, Oct 11 · Westminster, CO Westminster

Road 5kHalf Marathon

From $30 Open

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The Great Trailhead Foot Race 5 & 10 Miler

Sat, Oct 17 · Lakewood, CO Lakewood

Road 5 Miler10 Mile

From $55 Open

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Blue Sky Trail Marathon & Half Marathon

Sat, Oct 17 · Fort Collins, CO Fort Collins

Trail Blue Sky Trail Half MarathonBlue Sky Trail Marathon

From $90 Open

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Indian Creek Trail Runs

Sat, Oct 17 · Sedalia, CO Sedalia

Trail 5-Mile15-Mile55k +1

From $30 Open

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Race to Cure Sarcoma Denver

Sat, Oct 24 · Denver, CO Denver

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

From $10 Open

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Apex Foundation Trick or Trot 5K & Halloween Hunt

Sat, Oct 24 · Arvada, CO Arvada

Virtual Kids' 1-mile Halloween HuntTrick or Trot 5KTrick or Trot VIRTUAL 5K

From $10 Open

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Ghosts and Goblins 5K/10K

Sun, Oct 25 · Denver, CO Denver

Road Virtual Race5K10K

From $30 Open

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PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA

Sat, Oct 31 · 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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I Ain't Scared (of 5k)

Sat, Oct 31 · Thornton, CO Thornton

Road 5k

From $29 Open

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Foundry Halloween 5k

Sat, Oct 31 · Steamboat Springs, CO Steamboat Springs

Road Foundry 5K

From $25.75 Open

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Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

Sat, Oct 31 · Centennial, CO Centennial

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

From $30 Open

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Spooky Sprint - Colorado Springs

Sat, Oct 31 · Colorado Springs, CO Colorado Springs

Virtual 5k10KVirtual +4

From $17 Open Closing Soon 5 spots left

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All-Out Kooky-Spooky

Sun, Nov 1 · Golden, CO Golden

Virtual 5KVIRTUAL 5K10K +3

From $25 Open Closing Soon

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RMRR November Trophy Series

Sun, Nov 1 · Denver, CO Denver

Road 5k15k

From $10 Open

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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

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Turkey Trails- Denver

Sat, Nov 7 · Denver, CO Denver

Virtual 1 Mile5k10k +4

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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HRCA Backcountry Wilderness Half Marathon

Sat, Nov 7 · Lone Tree, CO Lone Tree

Trail Half Marathon

From $65 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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Colorado 24 Hour Run

Sat, Nov 7 · Fort Collins, CO Fort Collins

Road 6 Hour Relay6 Hour24 Hour Relay +3

From $90 Open Closing Soon

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Colorado Springs Veterans Day 5k

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Road Colorado Springs Veterans Day 5KKids 15 yrs and under 5k

From $15 Open

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Turkey Trails - Colorado Springs

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5k10k +4

From $17 Open 5 spots left

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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)5K 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)Boys 11 & 12 (Born 2014-2015) - 3K (1.86 Miles) +5

From $25.99 Open

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Denver Veterans Day Run

Sat, Nov 14 · Denver, CO Denver

Road 5K Run/Walk10K Run/Walk10K Rippetoe Rucksack Challenge

From $45 Open

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Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA

Sat, Nov 14 · 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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