About mountain biking in Grays Harbor County

Grays Harbor County, Washington has 36 named trails tagged for mountain biking, covering 56.4 miles, an average of 1.6 miles each. The longest is Larch Mountain West / Upper Twin Peaks, at 8.7 miles. 3 run 5 miles or longer.

What the mountain biking trails in Grays Harbor County are like

By length, 22 are under a mile, 11 run 1 to 5 miles, and 3 are 5 miles or longer. 1 is a loop, ending where it starts; the longest is Buck Lake Loop, at 1.8 miles.

Every one carries a difficulty rating: 13 easy and 23 moderate. Of the 36 with measured elevation, Larch Mountain West / Upper Twin Peaks climbs the most, about 2,817 ft, and 2 gain 1,000 ft or more.

All 36 mountain biking trails, longest first

Larch Mountain West / Upper Twin PeaksHikeMTB8.7 mi PorterHikeMTB7.2 mi North Rim #3HikeMTB6.9 mi Porter TrailHikeMTB4.6 mi Chehalis River TrailHikeMTB3.7 mi CrestlineHikeMTB3.4 mi Westport Light TrailHikeMTB2.3 mi Sylvia Ridge TrailHikeMTB1.8 mi Buck Lake LoopHikeMTB1.8 mi Lake TrailHikeMTB1.5 mi Basich TrailwayHikeMTB1.3 mi C-2710MTB1.3 mi Brownie TrailHikeMTB1.1 mi Greenline TieHikeMTB1.1 mi Porter FallsHikeMTB0.8 mi Jungle TrailHikeMTB0.8 mi Fuzzy Top TrailHikeMTB0.7 mi Aunt BethanyHikeMTB0.6 mi Mike-O-RamaHikeMTB0.6 mi East RoadHikeMTB0.6 mi Seabrook Perimeter TrailHikeMTB0.6 mi Mid-EarthHikeMTB0.6 mi West Fork Link-The JungleHikeMTB0.5 mi Espresso ShotHikeMTB0.5 mi Get the Stink OutHikeMTB0.5 mi Narnia TrailHikeMTB0.5 mi Porter Tie TrailHikeMTB0.4 mi GeronimoHikeMTB0.3 mi Joels TrailHikeMTB0.3 mi Cousin EddieHikeMTB0.3 mi West RoadHikeMTB0.2 mi Hot TomatoHikeMTB0.2 mi Maid Brigade TrailHikeMTB0.2 mi Zipline TrailMTB0.2 mi Aunt EdnaHikeMTB0.2 mi GrootHikeMTB0.1 mi

← All Grays Harbor 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 September 24, 2026.