According to Idaho ATV Regulations the ATV must be titled and registered with the recreation management agency, which in many states, is the Department of Natural Resources.
Although equipment requirements are subject to each state's regulations, Idaho's ATV regulations only require a muffle that meets the state's decibel limit and a spark arrester as required equipment for ATV operation. It is highly recommended your ATV also include headlights, brakes and taillights for visibility and safety purposes.
ATV regulations in Idaho prohibit driving the ATV or any other vehicle designed strictly for off-road use, on any public road. The only exception to this is if the ATV is used for agricultural purposes. Idaho ATV regulations have placed a weight and width limit on all ATVs. The maximum weight limit is 850 lbs with the width of the ATV being less than 46 inches. More information on ATV regulations concerning the weight and width limits can be obtained from the local recreation management agency.
Although Idaho does not list any ATV regulations concerning the age of the ATV operator or requirement for completion of a safety course, it is highly recommended the safety course be completed and the driver is mature and responsible when operating an ATV. The local recreation management agency can advise if any ATV regulations have changed within the state concerning the age of the operator, requirement of the safety course, or additional equipment necessary on the ATV.
ATV regulations are required by each state to operate the ATV. Following the ATV regulations is the responsibility of the owner or operator of the ATV and failure to do so could result in fines.