Upcoming running events

• Sat, 18 Jul, 2026 - 07:15 AM

  Tri Boulder Sprint, Olympic & Long Course

  Boulder Reservoir

  4+ Interested
• Sun, 12 Jul, 2026 - 07:15 AM

  Boulder Peak Triathlon, Duathlon, & Aquabike

  Boulder Reservoir

  82+ Interested
• Sun, 31 May, 2026 - 07:15 AM

  Harvest Moon Long Course Triathlon

  Boulder Reservoir

  16+ Interested
• Sat, 04 Apr, 2026 - 11:00 AM

  2026 Boulder Polar Plunge presented by Spectrum

  Boulder Reservoir

  11+ Interested
• Sat, 11 Apr, 2026 - 08:00 AM

  Boulder Rez Half Marathon

  Boulder Reservoir

  30+ Interested
• Sat, 06 Jun, 2026 - 07:15 AM

  Colorado Triathlon (Sprint, Olympic, Duathlon, & Aquabike)

  Boulder Reservoir

  147+ Interested
• Tue, 28 Apr, 2026 - 06:30 PM

  2026 Dash & Dine 5k Run Series

  5565 Reservoir Rd, Boulder, CO, United States, Colorado 80301

  12+ Interested
• Sun, 03 May, 2026 - 08:00 AM

  Emerge 5K 2026

  Boulder Reservoir

  8+ Interested
• Sun, 28 Jun, 2026 - 07:15 AM

  Boulder Sunrise Triathlon

  Boulder Reservoir

  6+ Interested
• Sat, 15 Aug, 2026 - 07:15 AM

  Boulder Rez Marathon

  Boulder Reservoir

  20+ Interested
• Sat, 08 Aug, 2026 - 08:00 AM

  Dirt Circus Boulder

  Runners Roost (Boulder)

  22+ Interested
• Wed, 18 Mar, 2026 - 07:30 PM

  Chelsea Sodaro: An Unlikely Journey to Triathlon, Motherhood, and Ironman World Champion

  Chautauqua Community House
• Sun, 26 Apr, 2026 - 10:00 AM

  Avery Spring 5k | Avery Brewing | 2026 CO Brewery Running Series

  Avery Brewing Company

  Free
• Sat, 14 Mar, 2026 - 04:00 PM

  Lucky Leprechaun 5K

  Twisted Pine Brewing

  12+ Interested
• Sun, 18 Oct, 2026 - 10:00 AM

  Avery Fall 5k | Avery Brewing | Boulder | 2026 CO Brewery Running Series

  Avery Brewing Company

  Free