Oregon Dunes National Recreation Area encompasses 31,500 acres along 40 miles of the Oregon coast within Siuslaw National Forest, stretching from Florence south to Coos Bay in Lane and Coos counties — one of the largest expanse of coastal sand dunes in North America and the most extensive OHV dune riding area in the Pacific Northwest. The dunes were designated by Congress in 1972 specifically to protect the dune ecosystem while providing managed recreation access, and the result is a carefully zoned landscape: vehicle use is permitted in approximately one-third of the total acreage (the open-sand and mixed-use areas), while ecological study areas and pedestrian-only zones protect deflation plains, wetlands, and the tree islands that characterize the Oregon coast dune ecosystem. Dunes reach up to 500 feet above sea level in the inland areas away from the immediate ocean margin. ATVs, off-road motorcycles, and dune buggies are permitted in the designated vehicle use areas; all vehicles must be licensed for the specific use zone they enter. Established campgrounds at Horsfall (Coos Bay area) and Spinreel provide the primary staging infrastructure, with parking, restrooms, and trailer access. The Oregon coast's marine climate gives the dunes a distinctly different riding character from desert dune systems: fog, rain, and moisture are common, wet sand compacts more firmly than dry desert sand, and summer temperatures stay mild enough for comfortable year-round riding. Contact the Oregon Dunes NRA office in Reedsport for current zone status and conditions (541-271-6000).

Tillamook State Forest OHV Area in Washington County, Oregon, is managed by the Oregon Department of Forestry and concentrates its approximately 52 miles of designated OHV trails around the Browns Camp staging area off NW Browns Camp Road near Forest Grove — approximately 30 miles west of Portland in the Oregon Coast Range. The Coast Range location gives Tillamook OHV riding a character specific to the wet western Oregon mountains: heavily forested corridor with Douglas fir, western hemlock, red alder, and sword fern understory; steep terrain where the ridges drop sharply into the creek drainages flowing west toward the Tillamook Bay watershed; and the consistently wet trail conditions that define Coast Range riding, where clay-soil sections become impassable after significant rain and the trail system requires active management to stay rideable. ATVs, UTVs, and dirt bikes are permitted on designated trails — most trail corridors are too narrow and steep for full-size 4x4 trucks. The trail system was substantially damaged in the 2020 Beachie Creek fire and has undergone a phased reopening from 2021 through 2023 with extensive restoration work; current trail status should be confirmed with the ODF Forest Grove office before visiting (503-359-7402). An Oregon OHV registration sticker and a Discover Oregon pass are both required for all riders. The Browns Camp trailhead has restrooms and trailer loading ramps. Hours are dawn to dusk year-round on open trails.