Endurance Events in Boulder, CO
Boulder, CO hosts 12+ upcoming endurance events across Colorado. The local race calendar includes running, triathlon and more. Whether you are training for your first 5K or preparing for a marathon, RACE helps you find every event in the Boulder area with dates, courses, and registration links.
Browse by Sport
Running (8)Triathlon (4)
Upcoming Events in Boulder
Running
Boulder Stroke & Stride
Boulder, CO
Running
Boulder Stroke & Stride
July 24, 2026
Boulder, CO
Triathlon
Boulder Kids' Tri Camp
Boulder, CO
Triathlon
Boulder Kids' Tri Camp
August 3, 2026
Boulder, CO
Triathlon
Rocky Mountain Tri-Fest Kids Tri 2026
Boulder, CO
Triathlon
Rocky Mountain Tri-Fest Kids Tri 2026
August 9, 2026
Boulder, CO
Triathlon
Rocky Mountain Tri-Fest Gravel
Boulder, CO
Triathlon
Rocky Mountain Tri-Fest Gravel
August 15, 2026
Boulder, CO
Triathlon
Boulder Sunset Triathlon
Boulder, CO
Triathlon
Boulder Sunset Triathlon
August 29, 2026
Boulder, CO
Running
Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado
September 27, 2026
Boulder, CO
Running
Hands & Voices New Year Virtual 5K: Trails to the Summit
December 31, 2026
Boulder, CO
