About mountain biking in San Juan County

San Juan County, Washington has 29 named trails tagged for mountain biking, covering 69.4 miles, an average of 2.4 miles each. The longest is bicycle, at 29.2 miles. 2 run 5 miles or longer.

What the mountain biking trails in San Juan County are like

By length, 14 are under a mile, 13 run 1 to 5 miles, and 2 are 5 miles or longer. 1 is a loop, ending where it starts; the longest is Center Loop Trail, at 1.8 miles.

Every one carries a difficulty rating: 7 easy, 21 moderate, and 1 hard. Of the 25 with measured elevation, Cold Spring Trail climbs the most, about 2,450 ft, and 5 gain 1,000 ft or more.

All 29 mountain biking trails, longest first

bicycleMTB29.2 mi Briggs Lake RoadHikeMTB5.2 mi Mountain Lake Loop TrailHikeMTB3.5 mi Cold Spring TrailHikeMTB3.1 mi North Boundary TrailHikeMTB2.6 mi North TrailHikeMTB2.6 mi Cady Mtn TrailHikeMTB2.3 mi Little Summit TrailHikeMTB2.2 mi Power Line TrailHikeMTB2.0 mi Cascade Creek TrailHikeMTB1.9 mi Center Loop TrailHikeMTB1.8 mi Traverse TrailHikeMTB1.8 mi Inner Loop RoadHikeMTB1.1 mi Mitchell Hill South TrailHikeMTB1.1 mi Raven Ridge TrailHikeMTB1.1 mi 3 Cedars TrailHikeMTB0.9 mi Zylstra Lake Trail (open seasonally)HikeMTB0.9 mi Burnt Stump TrailHikeMTB0.8 mi Mitchell Hill Center TrailHikeMTB0.7 mi Rainbow TrailHikeMTB0.7 mi Cady Viewpoint TrailHikeMTB0.6 mi Mitchell Hill North TrailHikeMTB0.5 mi 3 Cedars Trail ExtensionHikeMTB0.5 mi Muerte TrailHikeMTB0.5 mi Cady Mountain TrailHikeMTB0.4 mi Inner Loop TrailHikeMTB0.4 mi Outer Limits TrailHikeMTB0.3 mi Pipe Gate TrailHikeMTB0.3 mi Top of the Hill TrailHikeMTB0.3 mi

← All San Juan County trails

Trail geometry from OpenStreetMap contributors, licensed ODbL. Elevation from the USGS 3D Elevation Program. Compiled and published by Trailmonger · trail data last rebuilt October 25, 2026.