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.

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Sat, May 2 · 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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Adams County Foster Care 5K Run/Walk and 1 mile fun run

Sat, May 2 · Brighton, CO Brighton

Road 1 Mile Fun Run5K Foster Family Registration (up to 5 family members at same address)5K Students/Youth 18 & Under +2

From $0 Open Closing Soon

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MayFest Fun Run

Sat, May 2 · Parachute, CO Parachute

Road MayFest Color Run

From $30 Open

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DU Spring Sprint 5k

Sat, May 2 · Gunnison, CO Gunnison

Road DU Spring Sprint

From $10 Open

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The Colorado Marathon

Sun, May 3 · Fort Collins, CO Fort Collins

Road 5K10KHalf Marathon +1

From $35 Open

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DU Splash & Dash

Sun, May 3 · Denver, CO Denver

Triathlon DU Splash & Dash - Kids RaceDU Splash & Dash - Age Group RaceDU Splash & Dash - Collegiate Race

From $20 Open

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RMRR May Trophy Series

Sun, May 3 · Denver, CO Denver

Road 5k5mi

From $10 Open

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Frank Shorter Track Classic

Sun, May 3 · Longmont, CO Longmont

Road 1-Mile - 20 years & older1-Mile - 13 to 19 years1-Mile - 12 & under +14

From $10 Open

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Hayden Cog Run

Sun, May 3 · Hayden, CO Hayden

Road 5k Run8.4 Mile Run

From $25 Open

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2026 Altitude Elementary Moose Mudder

Sun, May 3 · Aurora, CO Aurora

Road 5KClubs & Activities 5KTeachers & Staff 5K

From $0 Open

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Water Wells for Africa 5k Walk/Run

Sun, May 3 · Silt, CO Silt

Road Water Wells for Africa 5k Run/Walk

From $35 Open

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Longmont Half & 5k (LM Half)

Sun, May 3 · Longmont, CO Longmont

Road 5kHalf Marathon

From $35 Open Closing Soon

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Emerge 5K

Sun, May 3 · Boulder, CO Boulder

Open

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May 7 - WMBA Kickoff Party @ Red Rocks Barn - COWGIRL theme!!

Thu, May 7 · Colorado Springs, CO Colorado Springs

2026 WMBA kickoff party - May 7

From $0 Open

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Parker Parks and Recreation Miles over the Meadow Mother’s Day 5K & Family Fun Trek

Sat, May 9 · Parker, CO Parker

Road Family Fun Trek5K

From $36 Open

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CEROX IRON + IRON X

Sat, May 9 · Frederick, CO Frederick

Cerox Iron X IndividualCerox Iron IndividualCerox Iron Teams of 2 +1

From $45 Open

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Run for the Trees - BSBF 2-Mile Run

Sat, May 9 · Loveland, CO Loveland

Road BSBF 2 Mile Fun Run

From $15 Open

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Kadet Football 5K

Sat, May 9 · Colorado Springs, CO Colorado Springs

Road 5K

From $32 Open

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Hometown Half Marathon & 5k/10k - Colorado Springs

Sat, May 9 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5kVirtual Run +4

From $17 Open Closing Soon 5 spots left

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2026 Five Star 5K, Mile of Smiles, and Wellness Festival

Sat, May 9 · Brighton, CO Brighton

Road Mile of SmilesFive Star 5K Run/Walk/Roll

From $5 Open

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Women's Distance Festival 5K

Sat, May 9 · Colorado Springs, CO Colorado Springs

Road 5K Run

From $20 Open

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Celebration of Moms 5k & Family Fun Run

Sat, May 9 · Buena Vista, CO Buena Vista

Road Celebration of Moms 5k

From $15 Open

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Springs Splash & Dash

Sat, May 9 · Colorado Springs, CO Colorado Springs

Triathlon Springs Splash & Dash 2026

From $20 Open

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Run For The Trees - 2 Mile Fun Run

Sat, May 9 · Loveland, CO Loveland

Virtual Virtual Run for the Trees Fun RunRun For The Trees Fun Run

From $20 Open

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Colterris Wine Run 5k

Sat, May 9 · Palisade, CO Palisade

Road 5k

From $30 Open Closing Soon

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Quad Rock 25 & 50 Mile Trail Races

Sat, May 9 · Bellvue, CO Bellvue

Trail Quad Rock 25Quad Rock 50

From $125 Open

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The Great CO74 Trail Run

Sat, May 9 · Kittredge, CO Kittredge

Trail The Great CO74 Trail RunThe Great CO74 Kids Run

From $20 Open Closing Soon 35 spots left

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HRCA Mother's Day 5K

Sat, May 9 · Highlands Ranch, CO Highlands Ranch

Road 5K Run/Walk

From $40 Open Closing Soon

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Cherry Creek Race for the Watershed 2026

Sat, May 9 · Aurora, CO Aurora

Road 5k Walk and Fun Run

From $31.38 Open

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Super Mom 5K/10K/Half - Colorado Springs

Sun, May 10 · Colorado Springs, CO Colorado Springs

Virtual 5K-No ShirtVirtual 5K5K +6

From $30 Open 6 spots left

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Denver Mother's Day 5K

Sun, May 10 · Denver, CO Denver

Road 5K

From $25.99 Open

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Colorado Women's Classic - Westminster

Sun, May 10 · Westminster, CO Westminster

Road 5k10k10 Miler

From $35 Open

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Hometown Half Marathon & 5k/10k - Denver

Sun, May 10 · Denver, CO Denver

Virtual 1 Mile5k10k +4

From $17 Open Closing Soon 5 spots left

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Girls on the Run 5K at Colfax - Running Buddies and Volunteers

Sat, May 16 · Denver, CO Denver

Road Running Buddy

From $25 Open

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The HIKE

Sat, May 16 · Cascade, CO Cascade

Virtual Walk, Run, or Hike Against Trauma

From $25 Open

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Vallecito Lake Heavy Half

Sat, May 16 · Bayfield, CO Bayfield

Road Vallecito Lake Heavy Half Marathon

From $75 Open

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Endure Trail Runs

Sat, May 16 · Divide, CO Divide

Trail 10kHalf MarathonMarathon +2

From $60 Open

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Spirit Challenge Run for Autism 10k and 5k

Sat, May 16 · Steamboat Springs, CO Steamboat Springs

Road 5k10k

From $25.75 Open Closing Soon

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Gluten Free Gallop 5K

Sat, May 16 · Littleton, CO Littleton

Road ROCK Fun Run2026 Gluten Free Gallop 5K

From $15 Open

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Black Canyon Ascent

Sat, May 16 · Montrose, CO Montrose

Road The 6-Mile Ascent (Challenge Walk)The 6-Mile Ascent (Run)

From $55 Open

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Growing Home - Colfax Fundraiser

Sat, May 16 · Denver, CO Denver

2026 Colfax Run Fundraiser for Growing Home (5k, 10 Miler, Relay, Half or Full Marathon)

From $0 Open

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Miles for Smiles 5K

Sun, May 17 · Arvada, CO Arvada

Virtual Miles for Smiles 5K - Virtual RaceMiles for Smiles 5KJordyn's Adaptive Dash - open to children who have received adaptive equipment from Two Angels Foundation

From $0 Open

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Canine On the Creek

Sun, May 17 · Dumont, CO Dumont

Road 1 Mile Fun Run/Walk5K Fun Run/Walk

From $25 Open

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Girls on the Run Rockies Colfax SoleMates 2026

Sun, May 17 · Denver, CO Denver

Road Colfax 1/2 MarathonColfax Relay TeamColfax Marathon

From $25 Open 3 spots left

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Healing Warriors Program 2026 Annual 5K Fun Run

Sun, May 17 · Fort Collins, CO Fort Collins

Healing Warriors Program 2026 Annual 5K Fun Run

From $40 Open

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AdventHealth Race to Rebuild

Wed, May 20 · Lone Tree, CO Lone Tree

Road Race to Rebuild

From $0 Open

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Run Wild! Rabies Free Africa 5K

Fri, May 22 · Virtual, CO Virtual

Virtual Run Wild! Rabies Free Africa 5K

From $45 Open Closing Soon

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Mile High Mile

Sat, May 23 · Boulder, CO Boulder

Road Open (FAT Timed)Open Chip Timed - All ages, all speedsElite *Invitational +4

From $10 Open

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Farish Trail Race

Sat, May 23 · Woodland Park, CO Woodland Park

Trail Kids Run5K10K +1

From $0 Open

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GMR Backyard Ultra

Sat, May 23 · Golden, CO Golden

Road GMR Backyard Ultra

From $50 Open

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