Thornton Lakes and Trappers Peak

Thornton Lakes trail cuts into the heart of the North Cascades, delivering alpine lakes and a scramble peak in under 10 miles. The first two miles follow an old logging road through second-growth forest with gentle grades. After that, the trail steepens through dense forest on rooty switchbacks that demand careful footwork, climbing steadily to a signed junction inside North Cascades National Park at mile 4.2.

From the junction, hikers choose between descending 600 feet on a steep, often muddy path to the lowest Thornton Lake, or climbing nearly 1,000 feet in under a mile to the summit of Trappers Peak. The peak scramble uses hands in places but stays low on the exposure scale. From the top, the Pickets Range and Mount Triumph dominate the skyline, with the Skagit River valley and Newhalem far below. The three Thornton Lakes sit in a glacially carved basin with an austere, alpine character that rewards the long approach.

Backpackers need a National Park backcountry permit for overnight stays at the lakes. Day hikers need only a Northwest Forest Pass for the trailhead. The access road is steep, narrow gravel but manageable for most cars. Plan 7 to 9 hours for the full out-and-back including Trappers Peak.