Trail permits are not required. Liability Insurance is mandatory for all snowmobiles. Helmets are not required. Roads that open are only roads that have not been plowed. Can legally ride in ditches and shoulders, only if there is no ditches.
Speed limits are the same as the posted road limit - outside of road row's, no speed limit.
There are 1,038 miles of groomed trails in Utah. There are 4,500 miles of groomed trails in Vermont. Snowmobilers from out of state must have certification that the after market exhaust meets the requirements that the manufacturer exhaust must meet. Helmets are not required. Roads are open to snowmobiles only when marked and signed for use.