Open carry is legal in Idaho. A concealed weapons permit is not required for open carry, nor for long guns (concealed or not). The firearm being openly carried must be clearly visible. A firearm can also be transported in a vehicle, as long as it is in plain view, or is disassembled or unloaded.
Idaho has state preemption of firearms laws, so local units of government can not regulate the ownership, possession, or transportation of firearms. The state constitution states that "No law shall impose licensure, registration or special taxation on the ownership or possession of firearms or ammunition. Nor shall any law permit the confiscation of firearms, except those actually used in the commission of a felony.
The possession of automatic firearms is permitted, as long such possession is in compliance with all federal regulations