Edgar Rock has served as a prominent landmark over the years. From the highway view it appears suitable terrain for mountain climbers only. But a trail winds up from the back side, avoiding the precipitous rock formations.
This is a great place for an early season hike as the snow recedes towards the higher elevations of the Cascades. The trail begins along the Naches River and quickly climbs through a series of switchbacks towards Edgar Rock. Hike at first through open, eastern Washington forests of Ponderosa pines, scenting the air and then wildflowers begin to take over; you'll see a variety of colors with yellow dominating the landscape as you switchback skyward.
Climbing ever higher, there is an unsigned junction just short of the top where the trail switches to Edgar Rock trail (up to now, it's been the Lost Creek Trail). After a little over a mile and half from the trailhead, the rocky summit is attained with views up and down the Naches Valley. There is also a small natural rock arch just off the summit.
At the summit, enjoy the views in all directions before heading back down the way you came.