Mount Sneffels, North Face, Winter Ascent. Kitty Calhoun and I climbed the north face of Mount Sneffels during a period of good weather in the second week of January. The approach was made up Blaine Basin. We ascended the eastern couloir of the north face for 100 feet and then traversed onto the main face, which we climbed directly to the summit. The climbing varied from excellent 60° snow to several mixed rock pitches. One open bivouac was made about halfway up the face.