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Trail races in Boulder County (2026-27)

2 upcoming trail races in Boulder County in the next 12 months. The next is Fall Skyline Traverse on Saturday October 24 in Boulder, from $25.

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• Sat24Oct

  Fall Skyline Traverse

  Sat Oct 24 · 6:00 AM · Boulder · Boulder County

  18 milesTrail

  from $25
• Sat31Oct

  Colleen De Reuck XC Classic

  Sat Oct 31 · 9:00 AM · Boulder · Boulder County

  1K3K5KTrail

  from $15