Blue Keystone, CO
Porcupine drops 1,099 vertical feet over 3,573 feet of skiing, with a steepest pitch of 24° about 1,810 feet below the top. That's steeper than 71% of the 5,615 blue runs we've measured in North America, and the 72nd steepest of 140 named runs at Keystone. It faces west.
Facing west at an average 18°, Porcupine gets about 109% of the winter sun that flat ground at Keystone does, December through March. That's sunnier than 79% of the runs we've measured, and the 36th sunniest named run at Keystone. Its top sits at 11,710 feet.
Angled toward the low winter sun, it bakes: powder turns heavy soon after a storm, and in spring it softens early in the day and refreezes hard overnight. 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.