Green Keystone, CO
Ten Mile drops 835 vertical feet over 5,030 feet of skiing, with a steepest pitch of 21° about 3,110 feet below the top. That's steeper than 91% of the 3,109 green runs we've measured in North America, and the 104th steepest of 140 named runs at Keystone. It faces west.
Facing west at an average 10°, Ten Mile gets about 100% of the winter sun that flat ground at Keystone does, December through March. That's sunnier than 72% of the runs we've measured, and the 45th sunniest named run at Keystone. Its top sits at 12,280 feet.
With little slope to hide behind, it takes nearly the full winter sun of open ground: powder settles and turns heavy sooner after a storm, and spring snow softens early. 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.