Take 2 or 3 days to hike this, to enjoy the glorious scenery. You'll wander through old-growth cedar, moss and ferns. In spring, the hillsides abound with a frenzy of wildflowers. But the vistas are pure Inland Northwest: vast views of the Selkirks and the Upper Priest River Valley are what hikers can expect along this 19-mile loop. And there are great opportunities for wandering — take a side trip and touch your toe into Canada. Scramble up Snowy Top Mountain. Climb to the Little Snowy Top lookout. Hiking clockwise is recommended.
The trail immediately gets down to the business of going down (about 1,800 feet in 3 miles) to the South Salmo River. Cross the river, taking a right (at the unmaintained trail to Canada) and follow the river upstream. As you walk in this forested river valley, the flora may make you think you're actually in the Cascades to the west; old-growth cedar and hemlock tower above you, and an understory of ferns and moss carpet the ground around you.
Just before you pass into Idaho (yes, Idaho!), there will be a spur trail on the right to an excellent campsite near the Old Salmo Cabin, an old trapper's cabin set into the wilderness. Water is available here — replenish your supply, or think about making this your spot to spend a night before continuing on your way.
Another 3.5 miles of steady climbing takes you to Snowy Top Pass. Another good campsite and water can be found just before entering the pass. Take advantage of this one, and don't expect many (if any) water sources for the next 7 miles after. Snowy Top Mountain (7,572 feet) will lure scramblers, while those who opt to stay on trail will delight in the views that the Shedroof Divide has to offer in this section. You'll get to wander along here for seven fabulous miles. About 1.5 miles after reaching the divide, you'll pass a 1-mile spur trail to the Little Snowy Top Lookout, which is open to the public. Dip off the main trail and visit the lookout site for even more fantastic views.
About 2.5 miles after the spur for Little Snow Top Lookout, you will see a fork in the trail with one direction labeled Shedroof Mountain, heading to the northwest. Take that trail back and down to continue along Shedroof Divide.
Alas, you cannot stay atop the Shedroof Divide forever. Shortly after passing back into Washington, you'll have to turn right off the Divide and take Trail 535 the final three miles to the trailhead.