This trailhead is across the road from the parking area for The Roosevelt Grove of Ancient Cedars at Stagger Inn Day Use Area north of Nordman, Idaho. The hike begins in Washington but crosses into Idaho at about the 3-mile mark. The trail is well-maintained for approximately 3.5 miles then becomes a bit of an obstacle course with fallen trees and brush to negotiate. You'll have to pay attention at times and backtrack when necessary.
Though some maps show a trail branching off to the left going directly up the ridge to the summit, no such trail exists. It also shows trail 266 abruptly ending on the south slope, but it in fact continues all the way to the saddle between Little Grass and Boulder Mountain.
There are some very nice groves of old-growth cedar along the way and evidence of ancient fires with giant burned-out snags. Several water sources exist throughout the hike.
The trail passes a junction to the south and continues north up to another spur east of the summit which goes to the top. If you arrive to an old road bed, you have gone too far. This is the eastern terminus of 266 and an old sign nailed to a tree marks the trail. Turn back and find the spur to the top which is well flagged.
The summit spur is easy enough to follow but becomes vague near the top. From here it is feasible to walk open meadows to the old lookout site at 5696 feet.