Directions:
From Ketchum, head south on Highway 75, or the paved Wood River Trail, for 5.5 miles to the Greenhorn/East Fork Road at the stoplight. Head right/west for 3.7 miles to the end of the Greenhorn Road at the FS Greenhorn Trailhead.
From Hailey, head north on the highway or the path. Its 5.5 miles to the Greenhorn/East Fork Road at the stoplight. Head left/west for 3.7 miles to the end of the Greenhorn Road at the FS Greenhorn Trailhead.
From the trailhead the Imperial Trail #315 is accessed by following the Greenhorn Trail #156 south from the parking area. The Greenhorn Trail immediately crosses the creek over two footbridges and then bends west to quickly gain the Imperial Trail on the left/south.
Once on Imperial, you will find that the trail climbs up for a ways through the trees before breaking out into the open and cresting. This saddle marks your entrance into the Imperial drainage. The trails drops from the saddle before the real climbing begins. The trails grade, and the surroundings it passes through change continually.
If you are climbing up Imperial you get several brief but welcome breaks along the way, brief being the key word here. If you are going the other way, having climbed up Greenhorn to get to the other end of Imperial, or come over some other way, a descent along the Imperial Trail definitely involves some climbing too. Traveling west to east on Imperial actually involves a lot of climbing. Check out the trails profile for as an aid in understanding why this is so.
For more detailed descriptions, topo maps, and information on the history, geology, and wildflowers of the Wood River Valley pick up a copy of
Exploring Sun Valley online or find it at one of several local shops.