While the Sun Valley Resort is well-known for its immaculately groomed runs and glitzy Hollywood skiing history, a lesser-known aspect of the area is the limitless access to backcountry skiing in the surrounding mountain ranges. As forecasted, clouds built on Saturday evening. We enjoyed a beautiful sunset on the White Cloud Peaks before preparing for the “40% chance of a trace.” After Sun Valley’s establishment in 1936, the burgeoning ski-school quickly developed a “ski-touring” arm to offer guests access to this winter wonderland of ski-terrain.  Backcountry cabins were erected at the foot of the Pioneers Mountains (aka The Pio Cabin) and up Owl Creek in the Smoky Mountains to serve as base-camps for guided ski trips with resort guests.   Today, two guide-services maintain backcountry huts and Mongolian style yurts nestled deep in the local mountain ranges.  They offer both guided and non-guided groups a comfortable base camp from which to explore the backcountry ski terrain. The group breaks a fresh trail into the Marshall Lakes Basin, just an hour and a half from the yurt.   We recently enjoyed a long Presidents Day weekend at the Williams Peak Yurt in the Sawtooth Mountains. (operated by Sawtooth Mountain Guides)  We …