Running Races in Boulder, Colorado 2026 | Browse All Races | My Next Race

There are 13 running races in Boulder, Colorado in 2026. The next is the Run for the River 5k Boulder on June 20. Distances include 5K races, ultras, trail runs.

Run for the River 5k Boulder

Sat, Jun 20 · Boulder, CO Boulder

Run for the River 5k Boulder

From $25 Open Closing Soon

Sunset Trail Running Festival

Sun, Jun 21 · Boulder, CO Boulder

Trail Kids 1K5K12K +1

From $15 Open Closing Soon

VIRTUAL 14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Sun, Jun 21 · Boulder, CO Boulder

Road Virtual 5K Run/Walk

From $30 Closed

2026 CANCELED-14th Annual Buffs4Life Kyle MacIntosh Memorial 5K Run/Walk

Sun, Jun 21 · Boulder, CO Boulder

Road In-Person 5K Run/Walk

From $30 Closed

BRR All-Comers Summer Track & Field Series #2

Thu, Jun 25 · Boulder, CO Boulder

Road Steeplechase (3000 + 2000)100m200m +11

From $20 Open Closing Soon 15 spots left

Pearl Street Mile

Sat, Jun 27 · Boulder, CO Boulder

Road Pearl Street MileKids 800m

From $15 Open Closing Soon

Avery Brewing Co. 4K on the 4th

Sat, Jul 4 · Boulder, CO Boulder

Road Avery Brewing Co. 4K on the 4th

From $40 Open Closing Soon

BRR All-Comers Summer Track & Field Series #3

Thu, Jul 9 · Boulder, CO Boulder

Road 5000m100M200M +10

From $20 Open 15 spots left

BRR All-Comers Summer Track & Field Series #4

Thu, Jul 23 · Boulder, CO Boulder

Road 100M200M400M +10

From $20 Open 15 spots left

Boulder Kids' Tri Camp

Mon, Aug 3 · Boulder, CO Boulder

Triathlon Boulder Kids' Tri Camp

From $200 Open 30 spots left

BRR All-Comers Summer Track & Field Series #5

Thu, Aug 6 · Boulder, CO Boulder

Road 100M200M400M +9

From $20 Open 15 spots left

Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado

Sun, Sep 27 · Boulder, CO Boulder

Virtual 5K (Virtual)10K (Virtual)1/2 Marathon (Virtual) +1

From $40 Open

Emerge 5K

Sun, May 2 · Boulder, CO Boulder

Closed