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.

The Valley Bottom Rio Trio

Sat, Jun 6 · Alamosa, CO Alamosa

Triathlon Kids RaceCo-Ed/Female Relay TeamSolo Male +3

From $15 Open 30 spots left

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J-Town Jog 5K and Kids 1 Mile Dash

Sat, Jun 6 · Johnstown, CO Johnstown

Road Kids 1 Mile Dash5K Run/Walk

From $20 Open Closing Soon 100 spots left

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Berthoud Day 5K

Sat, Jun 6 · Berthoud, CO Berthoud

Road 5K

From $30 Open Closing Soon

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Grand Valley Oncology - Life In Color 5K

Sat, Jun 6 · Grand Junction, CO Grand Junction

Road Grand Valley Oncology - Life in Color 5k (Untimed walk)Grand Valley Oncology - Life In Color 5K (Timed run)

From $35 Open

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Summits Trail Runs

Sat, Jun 6 · Granby, CO Granby

Trail 6-MileHalf MarathonMarathon +2

From $60 Open

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RMRR June Trophy Series

Sun, Jun 7 · Denver, CO Denver

Road 4km

From $10 Open

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Flamingo Day 5K

Sun, Jun 7 · Denver, CO Denver

Road 5KVirtual 5K

From $30 Open Closing Soon

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The Steamboat Marathon

Sun, Jun 7 · Steamboat Springs, CO Steamboat Springs

Road 10KHalf MarathonMarathon

From $70 Open

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DU Dash Colorado

Sun, Jun 7 · Palmer Lake, CO Palmer Lake

Road 5K10KYouth Dash

From $30 Open Closing Soon

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The Big Run Presented by Brooks

Sun, Jun 7 · Denver, CO Denver

Road The Big Run 5K presented by Brooks

From $40 Open

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Colorado 13er (Half Marathon/10k/5k)

Sun, Jun 7 · Louisville, CO Louisville

Road 5k10k13er

From $30 Open Closing Soon

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BRR All-Comers Summer Track & Field Series #1

Thu, Jun 11 · Boulder, CO Boulder

Road 3000m100M200M +11

From $0 Open 15 spots left

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Treat Trot - Denver

Sat, Jun 13 · Thornton, CO Thornton

Virtual 5K10K15K +4

From $17 Open

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The Springs Downhill Mile

Sat, Jun 13 · Colorado Springs, CO Colorado Springs

Road The Springs Downhill Mile

From $15 Open

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Guardian Games

Sat, Jun 13 · Loveland, CO Loveland

FemaleMale

From $65 Open Closing Soon 60 spots left

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All-Out Summer Breeze

Sat, Jun 13 · Arvada, CO Arvada

Virtual VIRTUAL 5K5KVIRTUAL 10K +3

From $25 Open

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Tutu Dash 5K

Sat, Jun 13 · Broomfield, CO Broomfield

Virtual Kids RunVirtual 5K5K Run/Walk

From $20 Open

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Stepping Stone 5K

Sat, Jun 13 · Littleton, CO Littleton

Virtual 2.5K Shortcut5K5K Virtual Run

From $30 Open Closing Soon

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Howelsen Hill Trail Run

Sat, Jun 13 · Steamboat Springs, CO Steamboat Springs

Road 4 MileHowelsen 8 Mile

From $25.75 Open

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San Juan Trail Tri

Sat, Jun 13 · Ridgway, CO Ridgway

Triathlon San Juan Trail Tri Individual Youth Entry ages 15-18San Juan Trail Tri Youth Team Entry Ages 12-18San Juan Trail Tri Team Entry +1

From $55 Open

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Sam's Rainbow Run

Sat, Jun 13 · Fort Collins, CO Fort Collins

Virtual Virtual 5k5k Run/WalkSTUDENT 5K

From $25 Open Closing Soon

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Garden of the Gods 10 Mile/10K and Trail Run

Sun, Jun 14 · Colorado Springs, CO Colorado Springs

Trail Trail Run10 Mile10K

From $60 Open Closing Soon

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Summer Kickoff Kids Duathlon 2026

Sun, Jun 14 · Colorado Springs, CO Colorado Springs

Triathlon Kids Duathlon

From $30 Open

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The Bullfrog Splashdown

Sun, Jun 14 · Littleton, CO Littleton

Road 5K Run (Timed)Bullfrog Relay (Fun Team Event)10k Run (Timed)

From $30 Open

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Garden of the Gods Little Horn and Big Horn Kids Races

Sun, Jun 14 · Colorado Springs, CO Colorado Springs

Open

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Treat Trot Colorado Springs

Sun, Jun 14 · Colorado Springs, CO Colorado Springs

Virtual 5K10K15K +4

From $17 Open

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HRCA Happy Hour Half K

Fri, Jun 19 · Littleton, CO Littleton

Road Half K

From $35 Open

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Freedom Tour Classic

Sat, Jun 20 · Fort Collins, CO Fort Collins

5K Walk15 Mile25 Mile w/Jersey +3

From $25 Open

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Red, White and Brew 5k, 10k & Half Marathon

Sat, Jun 20 · Windsor, CO Windsor

Road 1 Mile Fun Run5k Ruck5k run or walk +3

From $15 Open Closing Soon

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Mustang Mile 2026

Sat, Jun 20 · Kremmling, CO Kremmling

Road Speedy Joe- For the most fierce competitorsRegular Joe- For the "off the couch" crewSenior Joe- For the 65+ crowd +1

From $30 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 RunVirtual Run Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 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/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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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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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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Parker Parks and Recreation Dash Across the Dam Father’s Day 5K

Sat, Jun 20 · Parker, CO Parker

Road 5K

From $40 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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Fatherhood 5k Family Run/Walk

Sat, Jun 20 · Colorado Springs, CO Colorado Springs

Road Family Pricing (Immediate Family)Youth 8-18 yrsAdult 5k

From $15 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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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 Kids 5K5K

From $25 Open Closing Soon

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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 & Manly Mile (Men Only) +3

From $8 Open

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The Red Schoolhouse Run

Tue, Jun 23 · Louisville, CO Louisville

Road The Red Schoolhouse Run

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 10KNEW 26 Mile Mountain Bike Relay (Teams of Two) +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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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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Denver Pride 5K

Sat, Jun 27 · Denver, CO Denver

Road Denver Pride 5K

From $40 Open Closing Soon

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Loveland Lake to Lake Triathlon

Sat, Jun 27 · Loveland, CO Loveland

Triathlon Aqua Bike - OlympicSUP - OlympicSUP - Sprint +5

From $110 Open Closing Soon

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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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Before The Fourth 5k

Sat, Jun 27 · Littleton, CO Littleton

Road Before The Fourth 5k

From $35 Open

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Slacker Half Marathon-Relay-4-Mile Races

Sat, Jun 27 · Georgetown, CO Georgetown

Virtual Virtual 4 Mile4-Mile4 Mile - Military Veteran +4

From $35 Open Closing Soon

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