Half Marathons in Colorado 2026 | Upcoming Races & Dates | My Next Race

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.

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

Sat, Apr 10 · Centennial, CO Centennial

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

From $30 Open

Platte River Half-Marathon, Relay & 5k

Sun, Apr 11 · Littleton, CO Littleton

2027 5k5k5k +6

From $35 Open

Horsetooth Half Marathon - Presented by Fort Collins Connexion

Sun, Apr 18 · Fort Collins, CO Fort Collins

Half MarathonHalf Marathon

From $75 Open

Coffee Lover Run DENVER/AURORA

Sat, Apr 24 · Centennial, CO Centennial

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

From $30 Open

All-Out Beat the Heat

Sat, Apr 24 · Westminster, CO Westminster

VIRTUAL 5K5K5K +9

From $20 Open

Bigfoot Half Marathon

Sat, Apr 24 · Estes Park, CO Estes Park

5K Run/Walk5K Run/WalkHalf Marathon +1

From $45 Open

Vallecito Lake Heavy Half

Sat, May 15 · Bayfield, CO Bayfield

Vallecito Lake Heavy Half MarathonVallecito Lake Heavy Half Marathon

From $75 Closed

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

Sun, Jun 6 · Louisville, CO Louisville

5k5k10k +3

From $30 Closed

All-Out Summer Breeze

Sat, Jun 12 · Arvada, CO Arvada

5KVIRTUAL 5KVIRTUAL 5K +9

From $20 Open

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

Sat, Jun 19 · Windsor, CO Windsor

1 Mile Fun Run1 Mile Fun Run5k Ruck +9

From $15 Closed

All-Out Dog Days

Sat, Jul 10 · Westminster, CO Westminster

5KVIRTUAL 5K5K +9

From $20 Open

Summer Splash Prairie Dog Half, 10k, & 5k

Sat, Jul 17 · Castle Rock, CO Castle Rock

5k5k10k +3

From $25 Closed

TBK Bank Thirsty 13 Half Marathon

Sat, Aug 28 · Durango, CO Durango

Just The Race -- No Brewfest TicketRace Plus BrewfestRace Plus Brewfest +1

From $85 Closed

50 States Half Marathon Club General Membership

Fri, Feb 10 · Colorado Springs, CO Colorado Springs

50 States Half Marathon Club General Membership

From $85 Open

Fifty States Half Marathon Club Life Membership

Sat, Feb 11 · Colorado Springs, CO Colorado Springs

Fifty States Half Marathon Club Life Membership

From $429 Open