The Park Service’s 
Hoh Rain Forest Campground, 19 miles east from Highway 101 at the end of the road, is open year-round with in-the-trees camping for $10. The visitors center has evening naturalist programs in the summer.
The Department of Natural Resources has five small, free, year-round campgrounds near the Hoh River: Hoh Oxbow Campground (near milepost 176), Cottonwood Campground (two miles west on Oil City Rd.), Willoughby Creek Campground (3.5 miles east on Hoh Rain Forest Rd.), Minnie Peterson Campground (4.5 miles east on Hoh Rain Forest Rd.), and South Fork Hoh Campground (6.5 miles east on Hoh Mainline Rd.). Willoughby Creek is right on the river but has just three sites.