Larch Mountain is a peak in the Northern Oregon Coast Range in Washington County, Oregon. At 3,452 feet, it is the county’s second-highest mountain and stands near Timber along Oregon Route 6. Although Oregon has several places named Larch Mountain, this summit is part of the Coast Range, not the better-known peak in the Columbia Gorge. Its location near the highway places it in the forested uplands between the Willamette Valley and the coast, and its elevation makes it one of the more prominent summits in this part of Washington County.