Double black (extreme) A-Basin, CO
4th Tree Chute drops 340 vertical feet over 575 feet of skiing, with a steepest pitch of 43° about 210 feet below the top. That's steeper than 85% of the 2,251 double black runs we've measured in North America, and the 24th steepest of 161 named runs at A-Basin. It faces west.
Facing west at an average 37°, 4th Tree Chute gets about 89% of the winter sun that flat ground at A-Basin does, December through March. That's sunnier than 58% of the runs we've measured, and the 47th sunniest named run at A-Basin. Its top sits at 11,920 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.