Half Marathon races in Denver–Boulder, CO

Looking for half marathons near you in Denver–Boulder, CO? There are 56 upcoming half marathons listed here. The next one is Bound for Boston Marathon & Half Marathon - Denver on Sun, Aug 2, 2026 at Northfield High School — see the full list below for dates, venues, and registration links, and browse half marathons in other cities.

All 5K (150) 10K (70) Half Marathon (56) Marathon (7) Trail Run (12)

Sun, Aug 2, 2026 Bound for Boston Marathon & Half Marathon - Denver Northfield High School · Denver, CO · From $45 5K10KHalf MarathonMarathon Road
Sat, Aug 8, 2026 All-Out Runapalooza 14982 W 69th Ave · Arvada, CO · From $35 5K10KHalf Marathon Road
Sat, Aug 15, 2026 Bagel Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Aug 15, 2026 Run for PB& J 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, Aug 16, 2026 Erie Half & 5k Reliance Park · Erie, CO · From $30 5KHalf Marathon Road
Sat, Aug 22, 2026 Staunton Rocks! Marathon and Half Marathon 12102 S Elk Creek Rd · Pine, CO · From $90 5K10KHalf MarathonMarathon Road
Sat, Aug 22, 2026 Byers Peak Stampede Half Marathon & 5K Run 1741 Co Hwy 73 · Fraser, CO · From $45 5KHalf Marathon Road
Sun, Aug 23, 2026 Pioneer Prairie Dog Half, 10k & 5k 10600 Westminster Blvd · From $25 5K10KHalf Marathon Road
Sat, Aug 29, 2026 Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Aug 29, 2026 Sloth Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Sep 5, 2026 Golden Harvest Half Marathon & 5k/10k - Denver Parking Lot South of The Westin Westminster · From $17 5K10KHalf Marathon Road
Mon, Sep 7, 2026 Labor Day Half Marathon Salisbury Equestrian Park · Parker, CO · From $27 5K10KHalf Marathon Road
Sat, Sep 12, 2026 National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Sep 12, 2026 Run for Mental Health 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, Sep 13, 2026 Buffalo Bicycle Classic University of Colorado Boulder · From $125 Half MarathonTrail Run Trail
Sat, Sep 19, 2026 All-Out Fall Fest 10170 Church Ranch Way · Westminster, CO · From $35 5K10KHalf Marathon Road
Sat, Sep 26, 2026 Oktoberfest Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Sep 26, 2026 Run for Donuts 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Oct 3, 2026 Spooky Sprint - Denver Chatfield State Park · Littleton, CO · From $20 5K10KHalf Marathon Road
Sat, Oct 10, 2026 Bagel Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Oct 10, 2026 Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, Oct 11, 2026 Westy Half & 5k 10600 Westminster Blvd · From $30 5KHalf Marathon Road
Sat, Oct 31, 2026 Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Oct 31, 2026 PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, Nov 1, 2026 All-Out Kooky-Spooky 19500 W 64th Pkwy · Golden, CO · From $35 5K10KHalf Marathon Road
Sat, Nov 7, 2026 Turkey Trails- Denver Chatfield State Park · Littleton, CO · From $17 5K10KHalf MarathonTrail Run Trail
Sat, Nov 7, 2026 HRCA Backcountry Wilderness Half Marathon 11033 Monarch Blvd · Lone Tree, CO · From $65 5KHalf Marathon Road
Sat, Nov 14, 2026 Run for Mental Health 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Nov 14, 2026 Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Nov 21, 2026 TURKEY TREK (13.1, 10k, 5k & 2k) Ralston Creek Trail @ Long Lake Ranch Park · Arvada, CO · From $26 5K10KHalf Marathon Road
Sat, Nov 28, 2026 Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Nov 28, 2026 Thanksgiving Gobble Trot Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Dec 5, 2026 All-Out Fa La La 10170 Church Ranch Way · Westminster, CO · From $35 5K10KHalf Marathon Road
Sat, Dec 12, 2026 Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Dec 12, 2026 Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf MarathonMarathon Road
Sat, Dec 26, 2026 A Merry Christmas Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Dec 26, 2026 New Year's Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Jan 9, 2027 All-Out Polar Prowl 11200 W 58th Ave · Arvada, CO · From $35 5K10KHalf Marathon Road
Sat, Jan 16, 2027 MLK Jr. Freedom Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Jan 16, 2027 Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf MarathonMarathon Road
Sat, Jan 30, 2027 Coffee Lover Run DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Jan 30, 2027 Run for Donut DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Feb 6, 2027 All-Out Mardi Crawl 14982 W 69th Ave · Arvada, CO · From $35 5K10KHalf Marathon Road
Sat, Feb 13, 2027 Run for Chocolate 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Feb 13, 2027 Valentine's Day Run 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sat, Mar 20, 2027 Sunrise Marathon 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf MarathonMarathon Road
Sun, Mar 21, 2027 All-Out Spring Fever 19500 W 64th Pkwy · Golden, CO · From $35 5K10KHalf Marathon Road
Sat, Apr 10, 2027 Run for Bagels 5K/10K/13.1 DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, Apr 11, 2027 Platte River Half-Marathon, Relay & 5k 6745 S. Santa Fe Dr. · Littleton, CO · From $40 5KHalf Marathon Road
Sat, Apr 24, 2027 All-Out Beat the Heat 10170 Church Ranch Way · Westminster, CO · From $35 5K10KHalf Marathon Road
Sat, Apr 24, 2027 Coffee Lover Run DENVER/AURORA Piney Creek Hollow Park (Course Map will be emailed) · Centennial, CO · From $30 5K10KHalf Marathon Road
Sun, May 2, 2027 Colorado Marathon Poudre Canyon · Fort Collins, CO 5K10KHalf MarathonMarathon Road
Sun, Jun 6, 2027 Colorado 13er (Half Marathon/10k/5k) 1200 Dillon Road · Louisville, CO · From $30 5K10KHalf Marathon Road
Sat, Jun 12, 2027 All-Out Summer Breeze 11200 W 58th Ave · Arvada, CO · From $35 5K10KHalf Marathon Road
Sat, Jul 10, 2027 All-Out Dog Days 10170 Church Ranch Way · Westminster, CO · From $35 5K10KHalf Marathon Road
Sat, Jul 17, 2027 Summer Splash Prairie Dog Half, 10k, & 5k 5254 N Meadows Dr · Castle Rock, CO · From $25 5K10KHalf Marathon Road

New to the distance? Read how long to train for a half marathon, or set your target with the pace chart.

Quick answers

When is the next half marathon in Denver–Boulder?

The next Half Marathon in Denver–Boulder, CO is Bound for Boston Marathon & Half Marathon - Denver on Sun, Aug 2, 2026 at Northfield High School.

How many half marathons are coming up near me in Denver–Boulder?

There are currently 56 upcoming half marathons listed in Denver–Boulder, CO, each with a date, venue, and direct registration link.

What's the cheapest Half Marathon in Denver–Boulder?

The lowest listed entry right now is Golden Harvest Half Marathon & 5k/10k - Denver at from $17. Registration prices usually rise as race day nears, so early entry is cheapest.