Right up a ski run.

“Where there used to be six or eight folks hiking up the runs at dawn, there are now as many as 100 on a busy day, and many of those folks are hiking up the middle of a run or have dogs with them.”

Seems there are ski runs on public land at Bald Mountain in Sun Valley, Idaho. The hikers have every right to be there, just as they have every right to be crushed by a Sno-Cat.