Double black Alta, UT
The Keyhole drops 563 vertical feet over 1,528 feet of skiing, with a steepest pitch of 50° about 800 feet below the top. That's steeper than 99% of the 2,251 double black runs we've measured in North America, and the 3rd steepest of 117 named runs at Alta. It faces west.
Facing west at an average 23°, The Keyhole gets about 81% of the winter sun that flat ground at Alta does, December through March. That's shadier than 53% of the runs we've measured, and the 63rd shadiest named run at Alta. Its top sits at 9,810 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.