Oregon Coast Highway 101: 7 Days Astoria to Brookings

Three rules shape an Oregon Coast Highway 101 trip and they are not negotiable. First, every campground south of Astoria sits inside a DOGAMI-mapped tsunami evacuation zone - yellow (local Cascadia) or orange (distant Aleutian) - and ODOT has posted roughly 175 entering/leaving zone signs between Clatsop and Curry counties so drivers know when to scout high ground. Second, Oregon State Parks open reservations at 6:00 a.m. Pacific exactly six months before arrival on a rolling basis, and the four oceanfront parks on this route (Fort Stevens, Cape Lookout, Bullards Beach, Harris Beach) book out the same morning the window opens in summer. Third, from March 15 through September 15 the Siuslaw National Forest closes designated Oregon Dunes beach segments to vehicles, kites and dogs to protect federally threatened Western Snowy Plover nests - meaning the ATV plans for Day 5 need a backup if you arrive between those dates. This 363-mile, seven-day plan from Fort Stevens at the Columbia River bar down to Harris Beach near the California line works inside those windows, not around them.

Elevation profile, sea-level until it suddenly isn't: US-101 spends most of its 363-mile run between 0 and 80 ft AMSL, but five named headlands lift it briefly: Neahkahnie Mountain south of Cannon Beach climbs to 700 ft of cliff-top pavement (the highest viewpoint on the Oregon coast, ODOT MP 39.5-41.2), Cape Foulweather sits at 453 ft (MP 134), Cape Perpetua climbs to 800 ft of overlook on a 0.5-mile spur off the highway (MP 168, USFS Siuslaw National Forest), Cape Sebastian at 700 ft (MP 335), and Humbug Mountain at 1,756 ft sits inland of the highway but the climb past it on US-101 hits 500 ft. The headland climbs are 6-7% but short — a 32-ft Class C handles them in second gear at 35 mph. The real elevation hazard is wind exposure on the cliff tops, not engine load.

Length, width, and the Cape Creek Bridge problem: Oregon State Parks oceanfront loops cap at varying lengths: Fort Stevens accepts up to 50 ft hookup (Loop M), Cape Lookout maxes at 50 ft in Loop B, Beverly Beach at 40 ft (some longer pull-throughs), South Beach at 60 ft on its big-rig loop, Sunset Bay at 40 ft, Bullards Beach at 60 ft, Harris Beach at 50 ft (Oregon State Parks reservation database via ReserveAmerica). The Cape Creek Bridge (MP 178 just north of Heceta Head) was widened in 2018 to 32 ft of pavement, but the historic Conde McCullough bridges at Yaquina Bay (MP 141), Alsea Bay (MP 156), Umpqua River (MP 213), Coos Bay (MP 234), and Rogue River (MP 327) still carry only 24-26 ft of pavement on two-lane spans built in 1936. Class A coaches and 5th-wheels over 38 ft will see oncoming RV traffic uncomfortably close on the McCullough bridges; cross slow and stay tight to the right.

Seasonal window, the rain-shadow window is narrow: NWS Portland records show coastal Oregon averages 75 inches of rain per year, with 80% falling October 1 through April 30 (NWS PQR climate data 1991-2020). The dry window is July 1 through September 25. Storm season produces sustained 50-60 mph winds at headland exposures monthly from November through February — Sea Lion Caves anemometer recorded 122 mph in the Columbus Day Storm of 2021. Cape Blanco, the westernmost point in Oregon, averages 38 mph sustained in January. Even in summer, expect 8-12 inches of rain in 24 hours during atmospheric river events; ODOT closes US-101 at the Manzanita slide-prone segment (MP 41-44) on any 4+ inch event. Tsunami evacuation drills run the third Saturday of March each year per Oregon Office of Emergency Management.

Western Snowy Plover closures, the federal listing dictates the calendar: USFS Siuslaw National Forest closes designated beach segments March 15 through September 15 annually for plover nesting under the federal Endangered Species Act listing (1993). Closed segments rotate yearly based on prior-season nest counts; check fs.usda.gov/siuslaw before driving. 2026 closures include Sutton Beach (north of Florence), Siltcoos Beach south spit, Tahkenitch Creek estuary, and the Tenmile Creek dune complex south of Lakeside. The closures ban vehicles, dogs (even leashed), kites, and beach umbrellas above the high-tide line. Fines start at $250 first offense. ATV access to the Oregon Dunes National Recreation Area remains open in the John Dellenback Trailhead to Horsfall Beach corridor; the closure only affects the plover nesting strands.

Fuel, water, dump — coastal towns are 20-40 miles apart: Diesel pumps that fit a 40 ft coach: Warrenton (Fred Meyer fuel center, MP 7), Cannon Beach (Beach Mart at MP 30), Tillamook (Pacific Pride card-lock and Shell at MP 64), Lincoln City (Pacific Northwest Fuel at MP 113), Newport (Pacific Pride MP 141), Florence (Chevron MP 191), Coos Bay (Pacific Pride MP 234), Bandon (Chevron MP 248), Gold Beach (Chevron MP 327), Brookings (Chevron MP 357). Dump stations: Fort Stevens (free for guests, $10 non-guest), Nehalem Bay State Park ($5 dump), Cape Lookout (free for guests), Beverly Beach (free for guests), South Beach (free for guests), Honeyman State Park ($5), Sunset Bay (free for guests), Bullards Beach (free for guests), Humbug Mountain ($5), Harris Beach (free for guests). Potable water at every state park.

Cell coverage, marine layer drops carriers daily: Verizon holds the corridor best with usable LTE in every named town and most state park loops. AT&T works in Cannon Beach, Tillamook, Lincoln City, Newport, Florence, Coos Bay, and Brookings; dead between MP 41-58 (Neahkahnie to Tillamook) and MP 175-191 (Yachats to Florence on the Cape Perpetua segment). T-Mobile has expanded since 2024 but still drops between MP 28-50 and MP 168-195. The marine layer routinely degrades signal at Cape Foulweather, Cape Perpetua, Cape Blanco, and Cape Sebastian — fog reduces tower-to-handset path quality by 6-10 dB. NOAA Weather Radio KIH-65 (162.55 MHz Newport) covers the central coast 24/7.

Primary sources beyond what's footnoted below: Oregon Department of Geology and Mineral Industries tsunami inundation maps at oregon.gov/dogami, ODOT TripCheck (tripcheck.com) for US-101 conditions, USFS Siuslaw National Forest plover closures at fs.usda.gov/siuslaw, Oregon State Parks reservations at oregonstateparks.org/reserve (6 a.m. Pacific exactly 6 months out), Oregon Office of Emergency Management at oregon.gov/oem for evacuation drill schedules, and NWS Portland coastal forecasts at weather.gov/pqr.