Annual Races in Boulder

Boulder's stunning vistas and mild climate draw athletes and outdoor enthusiasts worldwide. Whether you're a runner, cyclist, swimmer or all three (hello, triathletes!) Boulder's premium facilities and high-altitude terrain offer the ultimate backdrop for training, competition and spectating. Here's a list of Boulder's annual races.

March Races
April Races
May Races
June Races
July Races
August Races
September Races
December Races

March Races

Lucky Leprechaun 5k

Runners wear green and enjoy post-run food and festivities at a local brewery.

Did You Know?

There are tons of running, biking and hiking groups in Boulder you can join while you are here? So you can keep your fitness routine up or try something new.

April Races

Boulder Roubaix Road Race

Highly regarded cycling race on an 18.7-mile (30k) loop with 43% paved roads and 57% unpaved roads in north Boulder County.

The Diabetes Link at CU 5K Run/Walk

Run and walk for Type 1 Diabetes research alongside the Juvenile Diabetes Research Foundation and the Children's Diabetes Foundation.

Boulder Rez Half Marathon

Scenic spring race featuring spectator-friendly half-marathon, 10K and 5K courses

View this post on Instagram

A post shared by BBSC Endurance Sports (@bbsctri)

May Races

BOLDERBoulder

One of the largest and most highly acclaimed 10Ks in the world, with runners, joggers, walkers and spectators of all ages — many in costume. It's part race, part party, with opportunities to slip-n-slide, do obstacle courses and jam along to garage bands before crossing the finish line in Folsom Field stadium.

Dash & Dine 5K Series

5K at Boulder Reservoir that finishes with dinner from local farms and restaurants.

Frank Shorter Classic 5K

Track meet honoring one of America's greatest distance athletes, Boulder's own Frank Shorter.

The Mother's Day Heart & Sole Half Marathon, 10K & 5K

Mother-daughter and mother-son teams have the chance to win awards.

Emerge 5K

Free community run/walk that raises funds to provide free mental health therapy to kids in the community struggling with suicidal thoughts.

Photo by BolderBoulder

BOLDERBoulder race starting line

June Races

Ironman 70.3 Boulder

"Half Ironman" taking place at the Boulder Reservoir. An athlete favorite for over a decade and one of the fastest IRONMAN events to sell out each year.

Colorado Triathlon

Community-oriented event that includes sprint and Olympic distances, duathlon and aquabike options.

Boulder Sunrise Triathlon

Argued to be one of the best and fastest triathlon courses in Colorado.

Pearl Street Mile

Criterium multi-lapped course that starts on Spruce St. (between 13th and 14th) and completes 3.75 laps around the Boulder Court House and up the Pearl Street Mall.

Summer All-Comer Track & Field Series

Boulder Road Runners hosts the premier track and field meet series in Colorado for all ages and abilities.

Buffs4Life Kyle MacIntosh Memorial Fun Run

Family event in the CU alumni community with current and former athletes, coaches and fans in support of other Buffs in need of medical assistance.

Sunset Trail Running Festival

A 28K, 12K, 5K and kids' 1K trail race that starts and finishes on the main street of Gold Hill, a mountain community in the Western foothills of Boulder.