The Cathedral Pass Loop is a 44-mile circuit through the heart of Washington's Pasayten Wilderness, following some of the best scenery on the Boundary Trail. Starting from Thirtymile Trailhead near Winthrop, this 4-5 day loop climbs to two high passes, Cathedral Pass at 7,400 feet and Apex Pass at 7,800 feet, and visits the Cathedral Lakes basin. This is classic North Cascades wilderness: remote, rugged, with wildflower meadows, jagged granite peaks, and long stretches where you're unlikely to see anyone else.
The loop follows the Chewuch River valley north through recovering burn areas from early 2000s fires before climbing into untouched alpine terrain. Expect solitude, abundant wildlife including black bears and possibly wolves, and hiking that is difficult but never technical. Backpackers willing to put in long days get big mountain scenery and a genuinely quiet wilderness in return. The loop is best suited for experienced backpackers comfortable with remote terrain, variable weather, and basic route-finding.
The Pasayten Wilderness requires a free, self-issued wilderness permit available at the Thirtymile Trailhead. Unlike quota-limited wilderness areas, permits are always available; just fill out the form at the trailhead kiosk before departing. Rangers may check for permits during patrols.
A Northwest Forest Pass ($5 day pass or $30 annual) is required for trailhead parking. Purchase passes online through the Forest Service or at ranger stations in Winthrop.
Campfires are prohibited above 5,000 feet elevation throughout the Pasayten Wilderness to protect fragile alpine ecosystems. Since most of the Cathedral Pass Loop's scenic camping sits above that line, plan to cook exclusively on stoves. During high fire danger periods (typically July-August), additional restrictions may prohibit campfires at all elevations. Pressurized canister stoves are always permitted.
Bear canisters are not required but strongly recommended given the active bear population. Follow Leave No Trace principles: camp at least 200 feet from water sources, pack out all waste, and use existing campsites to minimize impact. Group size limits are not specified, but smaller groups (6 or fewer) are encouraged.
For current regulations and fire restrictions, contact the Methow Valley Ranger District at (509) 996-4003 or visit the Okanogan-Wenatchee National Forest website.
Mid-July through September has the most reliable conditions for the Cathedral Pass Loop. The high passes, particularly Cathedral Pass at 7,400 feet and Apex Pass at 7,800 feet, typically hold snow well into July, and in heavy snow years may not fully clear until early August. Eastern-side trails generally go snow-free by early July, but western approaches can stay snow-covered until early August.
Early August is the sweet spot: snow has melted from the passes, mosquitoes have largely subsided, and weather is generally stable. July hikers should expect heavy mosquitoes and biting flies, especially around Cathedral Lakes, so bring head nets and long layers if traveling before August. One trip report from mid-July found Cathedral Lake more than half covered in snow and ice.
Late August through September brings cooler temperatures, fewer bugs, and fall larch colors in the high meadows, though weather grows more variable and early snowstorms are possible. By late September, freezing nighttime temperatures are common.
Wildflowers usually peak in mid to late July in the alpine meadows around Cathedral Pass and Apex Pass. Monsoons are not a factor in the North Cascades, but afternoon thunderstorms can develop in summer, particularly over exposed ridgelines.
Water is generally abundant along the Cathedral Pass Loop through mid-summer. The route follows the Chewuch River for the first 15+ miles, so water is reliable there. After leaving the river valley, expect good water every few miles: Cinch Creek, Cathedral Creek, and various springs near the high passes.
One spring deserves particular attention: it sits in a larch meadow near Windy Peak and is the only source between Cathedral Driveway and Windy Peak. Plan water carries of 2-3 liters for this stretch. Upper Cathedral Lake itself is a reliable source, though treat or filter all water, since livestock grazing occurs in some areas.
By late season (September), some smaller creeks and springs may run dry. Early season (July) brings the opposite problem: swollen creek crossings that may require fording or careful log navigation.
The nearest resupply is Winthrop, Washington, 29 miles from the trailhead. Winthrop has full services, including the Evergreen IGA grocery store (excellent deli and meat selection), Cascades Outdoor Store (owned by thru-hikers, well-stocked with gear and dehydrated meals), and Winthrop Mountain Sports for any equipment needs. The town is a popular PCT resupply point with backpacker-friendly services. No mail drops are available at the trailhead.
Creek crossings can be hazardous during early season runoff. The Pasayten River crossing early in some variations means fording thigh-deep, fast water; scout crossings carefully and cross in the morning, when flows are lowest. Cathedral Creek is a major crossing on the loop, so expect to get wet or search for log crossings. Some hikers report multiple tributary crossings of the Chewuch River that take careful navigation.
Black bears are common throughout the Pasayten, and grizzlies may occasionally roam the area, though sightings are rare. Multiple trip reports mention bear encounters, including sows with cubs near Cathedral Lake. Hang food properly or use bear canisters. The Pasayten also hosts the largest lynx population in the lower 48, plus wolves, moose, and mountain goats; give all wildlife plenty of room.
The first 6.5 miles cross extensive burn areas from 2001, 2003, and 2006 fires. Expect significant deadfall; some trip reports note "tons of downed trees" adding hours to travel time, and conditions vary year to year with trail maintenance. The burned sections have little shade, so carry sun protection and extra water.
Exposed terrain around both passes creates lightning hazard during afternoon thunderstorms. Don't camp directly on the passes, and plan to cross exposed sections in early morning.
Navigation is generally straightforward on maintained trails, but junctions can be confusing. Carry detailed maps and know whether you're taking the direct route to Upper Cathedral Lake or the longer Boundary Trail meander. Trail signage exists but may be weathered.
From Winthrop, Washington, drive north on East Chewuch Road (Okanogan County Road 1213), which becomes Forest Service Road 51. The road is paved for the first 23.5 miles to Andrews Creek Trailhead, then continues on well-maintained gravel for 5.5 miles to Thirtymile Trailhead. Any passenger car can make it; no high-clearance vehicle is required. Total distance is 29 miles from Winthrop.
Thirtymile Trailhead has vault toilets, stock ramps, and hitch rails, but no potable water. Parking is adequate, though the area is popular with horse packers.
Nearest airports: Pangborn Memorial Airport in East Wenatchee (100 miles, daily Horizon Air flights from Seattle) or Seattle-Tacoma International Airport (213 miles, 4-hour drive). Spokane is 3.5-4 hours away. Rental cars are available at all airports.
Methow Motion Shuttle Services (based in Winthrop) provides regional transportation and may offer trailhead shuttles. Otherwise, plan on leaving a vehicle at the trailhead; this is a loop, so no shuttle is required.
Highway 20 (North Cascades Highway) from Seattle to Winthrop typically opens in mid-April and closes with the first heavy snows in November. Confirm road status before traveling.
Plan a minimum 5-day trip for this loop. Rushing through in 3-4 days means long 11-15 mile days with heavy packs. Instead, move efficiently through the lower Chewuch valley (less scenic, more buggy) and set a high camp at Upper Cathedral Lake or near Apex Pass, where evening and morning alpenglow lights up the granite peaks.
Upper Cathedral Lake has the best camping, with multiple established sites around the shoreline and direct views of Cathedral Peak and Amphitheater Mountain. Apex Pass also has excellent camping and good sunrise and sunset photography, though the exposed sites mean cold nights and wind.
Consider optional side trips: Amphitheater Mountain (8,358 feet), Remmel Mountain, and Apex Mountain are all walkup scrambles requiring no technical gear. Cathedral Peak requires some Class 4 scrambling and possibly a rope for a "leap of faith" chasm near the summit; attempt it only if you're comfortable with exposure.
Hike counter-clockwise (up the Chewuch, over Cathedral Pass, over Apex Pass, down Tungsten Creek) to gain elevation gradually and save the Cathedral Lakes basin for mid-trip, when you're acclimated.
Solitude is nearly guaranteed. Most reports mention seeing no other hikers until day 3, and then only a handful. The Pasayten is one of Washington's largest wilderness areas and remains remarkably uncrowded compared to the Alpine Lakes or North Cascades National Park.
Bring multiple layers: temperatures at 7,800 feet can drop below freezing any night of summer, while the lower valley sections get hot. Afternoon thunderstorms develop quickly, so carry rain gear and don't linger on exposed passes when storms threaten.
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