Helmets are not required. There are no posted speed limits. 15 mph speed limit in congested areas around lodges. There are 2,000 miles of groomed trails in Colorado. Trail permits are not required for out of state snowmobilers.
All roads are open to snowmobilers.
Snowmobilers may ride the road shoulders and ditches. Helmets are not required. Speed limits are as posted. There are 7,200 miles of groomed trails in Idaho. Trail permits are required for out of state snowmobilers.