About mountain biking in San Juan County

San Juan County, Washington has 12 named trails tagged for mountain biking, covering 50.7 miles, an average of 4.2 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, 3 are under a mile, 7 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.

Of the 11 with a difficulty rating, 9 easy and 2 moderate. Of the 12 with measured elevation, Cold Spring Trail climbs the most, about 2,440 ft, and 4 gain 1,000 ft or more.

All 12 mountain biking trails, longest first

bicycleMTB29.2 mi Briggs Lake RoadHikeMTB5.2 mi Cold Spring TrailHikeMTB3.1 mi North Boundary TrailHikeMTB2.6 mi North TrailHikeMTB2.6 mi Cady Mtn TrailHikeMTB2.3 mi Center Loop TrailHikeMTB1.8 mi Inner Loop RoadHikeMTB1.1 mi Raven Ridge TrailHikeMTB1.1 mi Zylstra Lake Trail (open seasonally)HikeMTB0.9 mi Cady Mountain TrailHikeMTB0.4 mi Pipe Gate 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 4, 2026.