Iowa Code § 321G.20: Operation by persons under sixteen.

A person under sixteen years of age shall not operate a snowmobile on a designated snowmobile trail, public land, or public ice unless the operation is under the direct supervision of a parent, legal guardian, or another person of at least eighteen years of age authorized by the parent or guardian, who is experienced in snowmobile operation and who possesses a valid driver’s license, as defined in section 321.1, or an education certificate issued under this chapter.