Half Marathons in Colorado — 2026

There are 68 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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Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Sat, Sep 12 · Centennial, CO Centennial

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

From $30 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 RunVirtual Run Registration5K Registration +3

From $30 Open Closing Soon

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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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Battle by the Brook

Sat, Sep 19 · Deckers, CO Deckers

Family RaceCompetitive Race

From $89 Open 75 spots left

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All-Out Fall Fest

Sat, Sep 19 · Westminster, CO Westminster

5KVIRTUAL 5K10K +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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Run for Donuts 5K/10K/13.1 DENVER/AURORA

Sat, Sep 26 · Centennial, CO Centennial

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

From $30 Open

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

Sat, Sep 26 · Centennial, CO Centennial

Family 1 Mile Fun Run5K RegistrationVirtual Run Registration +3

From $30 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 (Virtual) +1

From $40 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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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

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

From $40 Open Closing Soon

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

Sat, Oct 10 · 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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Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA

Sat, Oct 10 · Centennial, CO Centennial

Family Fun Run 1 MileVirtual Run Registration (5K/10K/13.1)5K 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 MileVirtual Run Registration (5K/10K/13.1)5K Registration +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 Run5K RegistrationVirtual Run Registration +3

From $30 Open

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All-Out Kooky-Spooky

Sun, Nov 1 · Golden, CO Golden

VIRTUAL 5K5KVIRTUAL 10K +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 RegistrationVirtual Run Registration (5K/10K/13.1) +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 RunVirtual Run Registration5K 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 MileVirtual Run Registration (5K/10K/13.1)5K Registration +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 RunVirtual Run Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

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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 SantaAdult Chasing Santa 5kChasing Santa 5k KIDS 15 yrs and under +5

From $0 Open

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All-Out Fa La La

Sat, Dec 5 · Westminster, CO Westminster

5KVIRTUAL 5K10K +3

From $20 Open Closing Soon

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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 RunVirtual Run Registration5K/10K/13.1 Eco-Registration (No Shirt) +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 Mile5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration (5K/10K/13.1) +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 Run5K RegistrationVirtual Run 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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ALMAGEDDON Winter Triathlon presented by the Alma Foundation

Sat, Jan 16 · Alma, CO Alma

ALMAGEDDON Winter TriathlonALMAGeddon Winter Triathlon Relay

From $40 Open 75 spots left

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

Sat, Jan 16 · 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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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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Coffee Lover Run DENVER/AURORA

Sat, Jan 30 · 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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Run for Donut DENVER/AURORA

Sat, Jan 30 · Centennial, CO Centennial

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

From $30 Open

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All-Out Mardi Crawl

Sat, Feb 6 · Arvada, CO Arvada

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 MileVirtual Run Registration (5K/10K/13.1)5K/10K/13.1 Eco-Registration (No Shirt) +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 MileVirtual Run Registration (5K/10K/13.1)5K Registration +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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Time to Paddy 5K/10K & Lucky 13.1 13.1 - Denver

Sat, Mar 6 · Denver, CO Denver

1 Mile1 Mile5K +11

From $17 Open Closing Soon 5 spots left

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Time to Paddy 5K/10K & Lucky 13.1 - Colorado Springs

Sun, Mar 7 · Colorado Springs, CO Colorado Springs

1 Mile1 Mile5K +11

From $17 Open Closing Soon 5 spots left

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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 Registration5K/10K/13.1 Eco-Registration (No Shirt) +3

From $30 Open

Register →