Boulder County
County. Find your line here.
Trails772
Total length605 mi
Known loops18
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.
Hallie A Tungsten Mine
0.73 miGroundDifficulty unknownMallory Cave Trail
0.73 miGroundDifficulty unknownShanahan - North Fork Trail
0.73 miGroundDifficulty unknownSouth Forest Loop - Private Trail
0.72 miDifficulty unknownLost Lake Trail
0.72 miMixedMountain hikingBlack Slabbath
0.72 miGroundDifficulty unknown4th of July Road
0.72 miDirt,grassDifficulty unknownCoal Seam Trail
0.72 miDirtDifficulty unknownCaribou Ranch Link
0.71 miDirtHikingDeer Ridge Road
0.71 miDifficulty unknownFour Pines Trail
0.71 miDirtDifficulty unknownLittle Blue Lake Route
0.71 miDemanding mountain hikingShale Trail
0.71 miCompactedDifficulty unknownDave's Loop
0.70 miDifficulty unknownDeer Ridge Spur Road
0.70 miDifficulty unknownMarshall Mesa
0.70 miDirtDifficulty unknownWonderland Lake Trail
0.70 miFine gravelDifficulty unknownBeaver Reservoir Cutoff Trail
0.69 miGroundMountain hikingCrook's Nook
0.69 miDirtDifficulty unknownSingletree Trail
0.69 miWoodDifficulty 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 Boundaries can be incomplete or out of date.