Black diamond A-Basin, CO
Ptarmigan drops 426 vertical feet over 1,434 feet of skiing, with a steepest pitch of 25° about 1,100 feet below the top. That's steeper than 23% of the 4,740 black diamond runs we've measured in North America, and the 139th steepest of 161 named runs at A-Basin. It faces west.
Facing west at an average 17°, Ptarmigan gets about 82% of the winter sun that flat ground at A-Basin does, December through March. That's shadier than 52% of the runs we've measured, and the 107th shadiest named run at A-Basin. Its top sits at 12,300 feet.
It gets an ordinary dose of sun: powder lasts a typical amount of time, and spring snow softens on a normal schedule. Shading from ridges and trees isn't counted yet.
under 25°25–35°35–45°45°+ Hover to follow the line on the map.
Measured by ZRankings from 1-meter USGS lidar. Steepest pitch is the steepest stretch of about 50 vertical feet along the skiable line. Run lines come from OpenStreetMap and can sit a little off the skied path.