The South Fork Hoh River originates at , flowing from Hubert Glacier and other small glaciers on the south side of Mount Olympus. It flows generally west through Olympic National Park collecting many tributary streams. At about river mile 11 it enters a broad glacially carved U-shaped valley and becomes braided. The South Fork leaves Olympic National Park at approximately river mile 4, entering Olympic National Forest. It turns slightly northwest and joins the main Hoh River at approximately Hoh river mile 31. South Fork Campground, managed by Washington State DNR, is located on the South Fork. The road to the campground continues up the South Fork Hoh River to the South Fork Hoh Trailhead, just west of the national park boundary.