Boulder County

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Counts are trails in our data whose start point lies inside this boundary. A loop is counted only where the source marks it as one.

Search trails near Boulder County

Longest trails

Ordered by measured length. This is a simple fact, not a quality ranking.

• Arapaho Pass Trail

  12.2 miMixedMountain hiking

• Arapaho Glacier Trail

  7.57 miDirtMountain hiking

• Mesa Trail

  6.26 miGroundDifficulty unknown

• Pawnee Pass

  5.43 miGroundMountain hiking

• Finch Lake - Pear Lake Trail

  5.39 miDirtHiking

• Picture Rock Trail

  5.18 miDirtDifficulty unknown

• Beaver Creek Trail

  5.04 miGroundMountain hiking

• Sourdough Trail

  4.91 miGroundMountain hiking

• Open Sky Loop

  4.88 miLoopDifficulty unknown

• Saint Vrain Mountain Trail

  4.64 miHiking

• Night Hawk Trail

  4.57 miDirtDifficulty unknown

• Thunder Lake Trail

  4.46 miDifficulty unknown

• Sandbeach Lake Trail

  4.21 miGroundDifficulty unknown

• Walker Ranch Loop

  4.06 miDirtDifficulty unknown

• King Lake

  3.82 miMixedMountain hiking

• Bitterbrush Trail

  3.80 miDirtHiking

• Diamond Lake Trail

  3.69 miMixedMountain hiking

• North Sky Trail

  3.68 miDirtDifficulty unknown

• North Trail

  3.56 miGravelDifficulty unknown

• High Lonesome Trail

  3.43 miGroundDifficulty unknown

Official information

Parking, fees, permits, closures and rules are set by the managing agency and change often. We don't copy them here: check the official page before you go. Official page for Boulder County ↗ (link last checked 2026-10-17)

Source

© OpenStreetMap contributors (ODbL). Area boundary from OSM relation/1411337. Boundaries can be incomplete or out of date.