Half Marathons in Colorado — 2026

There are 65 half marathons in Colorado scheduled for 2026. The next is the Labor Day Half Marathon in Parker on September 7. Colorado half marathons run primarily September through February.

Labor Day Half Marathon

Mon, Sep 7 · Parker, CO Parker

5K10KVirtual Race +1

From $27 Open Closing Soon

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Black Squirrel Half Marathon

Sat, Sep 12 · Bellvue, CO Bellvue

Black Squirrel Half Marathon

From $90 Open Closing Soon

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

Sat, Sep 12 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open Closing Soon

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

Sat, Sep 12 · Centennial, CO Centennial

Family Fun Run 1 Mile5K Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open Closing Soon

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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

Half Priced Award EntryAscent

From $87.5 Open Closing Soon

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All-Out Fall Fest

Sat, Sep 19 · Westminster, CO Westminster

5KVIRTUAL 5KVIRTUAL 10K +3

From $20 Open Closing Soon

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20th Annual Golden Gallop

Sun, Sep 20 · Golden, CO Golden

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 5 Mile5 MileVirtual Half Marathon +1

From $50 Open

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

Sat, Sep 26 · Centennial, CO Centennial

Family 1 Mile Fun Run5K Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

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

Sat, Sep 26 · Centennial, CO Centennial

Family Fun Run 1 MileVirtual Run Registration (5K/10K/13.1)5K Registration +3

From $30 Open

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14er Fest 14K & 5K

Sun, Sep 27 · Buena Vista, CO Buena Vista

5K14K

From $35 Open

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RMRR Fall Marathon Training Series #3

Sun, Sep 27 · Thornton, CO Thornton

RMRR Fall Marathon Training Series #3 - 10 MileRMRR Fall Marathon Training Series #3 - 20 Mile

From $20 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

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

From $40 Open

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Emerald Mountain Trail Run

Sat, Oct 3 · Steamboat Springs, CO Steamboat Springs

4 Mile12k

From $25.75 Open Closing Soon

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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

5K Road RunVIRTUAL 5k Run/Walk8 Mile Trail Run +3

From $40 Open Closing Soon

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

Sat, Oct 10 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Oct 10 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open

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Westy Half & 5k

Sun, Oct 11 · Westminster, CO Westminster

5kHalf Marathon

From $30 Open

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Mancos Cowboy Half Marathon, 5K, and Fun Run

Sat, Oct 24 · Mancos, CO Mancos

Mancos 5KMancos Cowboy Half Marathon

From $25 Open

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

Sat, Oct 31 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Oct 31 · Centennial, CO Centennial

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

From $30 Open

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All-Out Kooky-Spooky

Sun, Nov 1 · Golden, CO Golden

5KVIRTUAL 5K10K +3

From $20 Open

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RMRR November 5k/15k

Sun, Nov 1 · Denver, CO Denver

5k15k

From $10 Open

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

Sat, Nov 14 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Nov 14 · Centennial, CO Centennial

Family 1 Mile Fun Run5K RegistrationVirtual Run Registration +3

From $30 Open

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TURKEY TREK (13.1, 10k, 5k & 2k)

Sat, Nov 21 · Arvada, CO Arvada

2k Turkey Toddle (un-timed)5k Turkey Trot10k Turkey Trek +1

From $26 Open

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Thanksgiving Gobble Trot Run 5K/10K/13.1 DENVER/AURORA

Sat, Nov 28 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Nov 28 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open

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All-Out Fa La La

Sat, Dec 5 · Westminster, CO Westminster

VIRTUAL 5K5KVIRTUAL 10K +3

From $20 Open Closing Soon

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Chasing Santa 5k/Cycling Santa Toy Drive Presented by: Springs Law Group

Sat, Dec 5 · Colorado Springs, CO Colorado Springs

Toddlers Chasing SantaChasing Santa 5k KIDS 15 yrs and underAdult Chasing Santa 5k +5

From $0 Open

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Rock Canyon Half Marathon- 40th Anniversary Run!

Sun, Dec 6 · Pueblo, CO Pueblo

Mini Rock Canyon 5k1/2 marathon

From $35 Open Closing Soon

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Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA

Sat, Dec 12 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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

Sat, Dec 12 · Centennial, CO Centennial

Family Fun Run 1 MileVirtual Run Registration (5K/10K/13.1)5K Registration +3

From $30 Open

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New Year's Run 5K/10K/13.1 DENVER/AURORA

Sat, Dec 26 · Centennial, CO Centennial

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

From $30 Open

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A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA

Sat, Dec 26 · Centennial, CO Centennial

Family 1 Mile Fun RunVirtual Run Registration5K Registration +3

From $30 Open

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All-Out Polar Prowl

Sat, Jan 9 · Arvada, CO Arvada

VIRTUAL 5K5KVIRTUAL 10K +3

From $20 Open

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MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORA

Sat, Jan 16 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Jan 16 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open

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ALMAGEDDON Winter Triathlon presented by the Alma Foundation

Sat, Jan 16 · Alma, CO Alma

ALMAGEDDON Winter Triathlon

From $40 Open 75 spots left

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Run for Donut DENVER/AURORA

Sat, Jan 30 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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Coffee Lover Run DENVER/AURORA

Sat, Jan 30 · Centennial, CO Centennial

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

From $30 Open

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All-Out Mardi Crawl

Sat, Feb 6 · Arvada, CO Arvada

VIRTUAL 5KVIRTUAL 5K5K +9

From $20 Open

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

Sat, Feb 13 · Centennial, CO Centennial

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

From $30 Open

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Valentine's Day Run 5K/10K/13.1 DENVER/AURORA

Sat, Feb 13 · Centennial, CO Centennial

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

From $30 Open

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The Toyota Super Half Marathon™& Game Day 5K™

Sun, Feb 14 · Colorado Springs, CO Colorado Springs

5KHalf Marathon

From $35 Closed

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Lucky Brew Race 5K, 10K, 15k & Half Marathon

Sun, Mar 14 · Severance, CO Severance

Kids Fun RunKids Fun RunLucky Brew 5K +7

From $15 Open

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

Sat, Mar 20 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open

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All-Out Spring Fever

Sun, Mar 21 · Golden, CO Golden

5KVIRTUAL 5KVIRTUAL 5K +9

From $20 Open

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SuperHeroes Run DENVER/AURORA

Sat, Mar 27 · Centennial, CO Centennial

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

From $30 Open

Register →