National Forest and Wilderness Information
The vast majority of backcountry skiing and riding in the US takes place on public land administered the US Forest Service (Department of Agriculture) or the National Park Service (Department of Interior). There’s a lot of red tape to deal with, including permits, quotas, use restrictions, etc. “Know Before You Go” and remember to respect the wilderness so future generations can enjoy it!
Wilderness.net – A clickable national map with links to all US wilderness areas, including comprehensive information on permits and other requirements.