Colorado Half Marathons

Colorado Half Marathons by City • By Date

Each half marathon that takes place in Colorado is listed below, and when you click the link you’ll find info for each race — what the course is like and a map of the route, the elevation change, whether it’s fast and flat or hilly and challenging, how to sign up, and more.


You’ll also find contact info if you’re having problems with your registration or need to contact the race directors.

2022 calendar of Colorado half marathons

Arvada

All-Out Polar Prowl Half Marathon, 10K & 5K

All-Out Mardi Crawl Half Marathon 10K & 5K

All-Out Summer Breeze Half Marathon, 10K & 5K

All-Out Runapalooza Half Marathon 10K & 5K

Ralston Creek Half Marathon

Spring Fling Prairie Dog Half Marathon 10K & 5K

Aspen

Aspen Valley Marathon Half Marathon & 5k

Golden Leaf Half Marathon

Bayfield

Vallecito Lake Heavy Half

Boulder

Boulderthon Marathon & Half Marathon

Boulder Rez Half

Boulder Rez Marathon 19.7M Half Marathon 10k & Relay

Brighton

Adams Half & 5k

Barr Lake Half Marathon

Runs with Scissors Marathon Half Marathon & 50K

Buena Vista

Autumn Color Run Half Marathon, 10K & 5K

Canon City

Rim to Rim Royal Gorge Races Half Marathon

Castle Rock

Castle Rock Trail Festival 50k Half Marathon 10k & 5k

Live Free ROCK-IT Run Half Marathon 5k & 1k

Prairie Dog Half Marathon 10K & 5K

Colorado Springs

Colorado Springs Marathon, Half Marathon & 5K

Super Half Marathon & 5K Family Run/Walk

Valkyrie Trail Race Marathon Half Marathon 50K & 4-Mile

Creede

Runoff Runoff Marathon, Half Marathon & 6K

Denver

Colfax Marathon, Half Marathon, Relay & Urban 10-Miler

Three Creeks Half Marathon

Divide

Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges

Durango

Southwest Series Marathon Half Marathon 10K & 5K – Day 2

Thirsty 13 Half Marathon

Eagle

Mountain Rats Marathon Half Marathon & 55K

Erie

Erie Half Marathon & 5K

Estes Park

Estes Park Marathon Half Marathon 10k & 5k

Rocky Mountain Half Marathon

Evergreen

Bergen Peak Half Marathon

Revel Rockies Marathon & Half Marathon

Fairplay

South Park Trail Marathon Half Marathon & Ultra

Firestone

Carbon Valley Half Marathon & 5K

Fort Collins

Bergen Peak Half Marathon

Black Squirrel Half Marathon

Colorado Marathon Half Marathon 10k 5k & Relay

Fall Equinox Marathon Half Marathon & 5M

Horsetooth Half Marathon

Long View Marathon & Half Marathon

Revel Rockies Marathon & Half Marathon

Spring Equinox Half Marathon

Four Corners Monument

Four Corners Quad Keyah Marathon Half Marathon 5k & 2M

Frisco

Run the Rockies Half Marathon & 10k

Run the Rockies Trail Race Half Marathon & 10k

Fruita

Desert RATS Trail Running Festival Half Marathon & 10k

Fruita Trail Half

Georgetown

Georgetown to Idaho Springs Half Marathon

Glenwood Springs

Sunlight Showdown Half Marathon

Golden

All-Out Spring Fever Half Marathon 10K & 5K

Black Hawk Trail Half Marathon

Granby

Snow Mountain Ranch Trail Running Festival

Greenwood Village

That Dam Run Half Marathon 10K & 5K

Highlands Ranch

Backcountry Wilderness Half Marathon,

Mountain Ridge Trail Half Marathon

Littleton

Colorado Brewery Running Series – Breckenridge Brewing Half Marathon & 5k

Frosty’s Frozen 5k 10k & Half Marathon

Platte River Half Marathon & Buckhorn Exchange Relay

Longmont

Longmont Half Marathon & 5K

Louisville

Arctic Prairie Dog Half Marathon 10K & 5K

Colorado 13er Half Marathon 10K & 5K

Louisville Trail Race Half Marathon 10K & 5K,

Loveland

NOCO Half Marathon

Ouray

Mount Sneffels Half Marathon

Parker

Labor Day Half Marathon

Pine

Staunton Rocks! Marathon & Half Marathon

Salida

Run Through Time Marathon, Half Marathon & 2-Mile Run

Steamboat Springs

Colorado Brewery Running Series – Breckenridge Brewing Half Marathon & 5k

Steamboat Marathon, Half Marathon & 10K Run/Walk

Westminster

All-Out Beat the Heat Marathon Half Marathon 10K & 5K

All-Out Dog Days Half Marathon 10K & 5K

All-Out Fa La La Half Marathon, 10K & 5K

All-Out Fall Fest Marathon Half Marathon 10K & 5K

Pioneer Prairie Dog Half Marathon 10K & 5K

Westminster Trail Half Marathon

Westy Half & 5k

Windsor

Windsor Marathon Half Marathon & Heavy 10K