Running Races in Boulder, Colorado 2026 | Browse All Races

There are 6 running races in Boulder, Colorado in 2026. The next is the Boulder XC Series Meet 1 on October 10. Distances include 5K races, half marathons, ultras.

Boulder XC Series Meet 1

Sat, Oct 10 · Boulder, CO Boulder

Road 1K XC - 10 Years & Under3K XC - 16 Years & Under5K XC - Open

From $10 Open Closing Soon

Fall Skyline Traverse

Sat, Oct 24 · Boulder, CO Boulder

Road Fall Skyline Traverse

From $25 Open Closing Soon 100 spots left

Colleen De Reuck XC Classic

Sat, Oct 31 · Boulder, CO Boulder

Road 1K XC - 10 Years & Under3K XC - 16 Years & Under5K XC - Open

From $15 Open

Alpine Bank Boulder Thanksgiving Day 5K

Thu, Nov 26 · Boulder, CO Boulder

Road 5KKids 800M

From $15 Open

Hands & Voices New Year Virtual 5K: Trails to the Summit

Thu, Dec 31 · Boulder, CO Boulder

Virtual Virtual 5KVirtual Fun Run/Walk

From $25 Open

Emerge 5K

Sun, May 2 · Boulder, CO Boulder

Closed

Running Races in Boulder, Colorado — 2026