This route starts at the Buffalo Cabin trailhead at the top of Ryan Gulch Rd in Silverthorne. This route does not climb up the couloir.
Follow the (usually) well-tracked trail passed the 4-way trail intersection [~0403940 4386558] and up to the Buffalo cabin remains. At around 10,400 ft [~0403547 4386072], go left off the summer trail and begin to climb southwesterly and then westerly up the somewhat steep east side of Buffalo Mtn. You're aiming for the "mushroom stem"**. Reach treeline at around 11,500 ft [~0402828 4386045] and head left up and over the mushroom cap. Switchback through this area until the slope eases considerably on top of the cap. The summit is obvious from there and the route up easy. It's not necessary to go to the summit but ski from the summit if the snow is continuous.
The Silver Couloir
starts .25 miles north of the summit. The entry is at the top of a broad "Y". Most start down the skier's left of the "Y", at around 12,500 ft [~0401980 4386235]. There's no mistaken the route from there; it's 2,700 uninterrupted feet down.
Summary: Total trip 5.2 miles, 3,435 ft., 4.0-4.5 hours (avg pace)
**If you don't know what the "mushroom" is, take a look at Buffalo Mtn from almost anywhere in Dillon in the winter and look for the obvious right-leaning avalanche scar with a large rocky outcrop at the top that together form a mushroom. The summer trail goes over the mushroom's cap. There are actually two mushrooms on Buffalo; the other one is on the viewer's left, not relevant for this tour.