Green Keystone, CO
I-70 drops 229 vertical feet over 1,018 feet of skiing, with a steepest pitch of 15° about 370 feet below the top. That's steeper than 57% of the 3,109 green runs we've measured in North America, and the 127th steepest of 140 named runs at Keystone. It faces north.
Facing north at an average 13°, I-70 gets about 69% of the winter sun that flat ground at Keystone does, December through March. That's shadier than 73% of the runs we've measured, and the 31st shadiest named run at Keystone. Its top sits at 10,730 feet.
Shaded snow stays colder and drier, so it holds powder longer after a storm and is slower to crust over or turn to slush in spring. 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.