52,129 mapped trails and 3,436 federal parks across 4 states. A complete regional guide.
The Pacific Northwest is the densest concentration of public lands and serious hiking terrain in the United States. The four states in this region — Washington, Oregon, Idaho, and Alaska — together contain three of the country's most-visited national parks (Olympic, Mount Rainier, Glacier Bay), the largest contiguous wilderness in the lower 48 (the Frank Church-River of No Return in Idaho), and more than half of the country's federally designated wilderness acreage when Alaska is included.
What makes hiking here distinct from other regions isn't just the scale of the terrain — it's the diversity within a few hours' drive. A weekend in Seattle can start on Mount Rainier's volcanic flanks Saturday morning and end on a Pacific coast tide flat Sunday afternoon. A weekend in Portland can cover the Columbia River Gorge's waterfall corridor and the high Cascades alpine country in the same trip. The region rewards hikers who plan for variety.
It also demands more weather awareness than any other US region except Alaska itself. Cascade and Olympic summits hold weather a full season behind the lowlands; what's a sunny 70°F afternoon in Seattle can be a freezing rain whiteout 3,000 feet higher on Mount Si. Every serious PNW hiker carries layers and a real rain shell, even on bluebird summer days.
By the numbers
52,129Mapped trails
3,436Federal parks
4States covered
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The signature long-distance trails
The Pacific Crest Trail crosses 1,150 miles of Pacific Northwest terrain — roughly 800 in Oregon and Washington combined, plus the entire trail's official southern start in the region's southern Cascade volcanoes. The Pacific Northwest Trail traverses Washington and northern Idaho. The Wonderland Trail circumnavigates Mount Rainier in 93 miles. Alaska adds the Chilkoot, Crow Pass, and Resurrection Pass routes — committing alpine backpacking that demands self-sufficiency the lower 48 rarely requires.
For weekend hikers, the long-trail corridors are equally valuable as day-hike networks. The PCT in Oregon's Three Sisters Wilderness, Washington's Goat Rocks, and the Sawtooth Wilderness in central Idaho all support world-class day hiking from accessible trailheads.
Seasonal hiking windows by sub-region
High Cascades and Olympic peaks: mid-July through mid-September is the practical window. Snow lingers above 5,000 feet well into June; September brings the first big storms.
Olympic rainforest and coastal trails: year-round, with caveats. Winter brings dramatic storm-watching and waterfall conditions but also genuine flood risk on coastal hikes.
Eastern Washington and Oregon high desert: April-May and September-November are best. Summer heat hits 100°F in the basin; winter brings ice and short days.
Idaho Sawtooth and Frank Church: July-September only for high routes. Lower-elevation Boise foothills hike year-round.
Alaska: mid-June through August is the practical hiking window. Glacier travel, bear awareness, and unbridged stream crossings raise the difficulty floor compared to lower-48 terrain.
Weather hazards specific to the PNW
Hypothermia is the leading weather hazard on summer Cascade and Olympic hikes — the deceptive failure mode is a 75°F trailhead that drops to 45°F + rain at the high point. Pack a real rain shell and a midlayer every time you head above 4,000 feet between June and October.
Wildfire smoke is the new normal in late summer. Check the EPA AirNow app before any high-elevation hike in August-September; a smoky day above treeline can spike PM2.5 to genuinely hazardous levels.
River crossings on PCT and Wonderland Trail sections become dangerous in heat waves when snowmelt accelerates. Plan creek crossings for early morning when flows are lowest.
Best parks and protected lands
Olympic National Park anchors Washington's hiking scene — coast, rainforest, and alpine terrain in a single park. Mount Rainier National Park draws every PNW hiker eventually; the Wonderland Trail circumnavigation is the marquee multi-day. North Cascades National Park is the wildest national park in the lower 48 by visitor density and by terrain seriousness.
Oregon's Crater Lake National Park is the photographic centerpiece; Mount Hood National Forest and the Three Sisters Wilderness offer broader hiking inventory. Idaho's Sawtooth National Recreation Area and the Frank Church-River of No Return Wilderness are the headlining destinations.
Alaska's Denali, Wrangell-St. Elias, Gates of the Arctic, and Katmai are wilderness in the original sense — most trailless, demanding genuine route-finding and bear awareness.
States in this region
Each state page is a hub for county-level, city-level, and individual trail detail — plus state-specific ranked guides.
For trip planning specifics, drill into the state pages below. Each links through to county-level lists, individual trail detail pages with weather forecasts, and federal park / campground inventories from Recreation.gov. The blog catalog also includes state-by-state ranked guides — longest trails, steepest climbs, family hikes, waterfall hikes, and dog-friendly trails — for each PNW state.
