Wis. Stat. § 350.05: Operation by youthful operators restricted.

(1) Persons under 12. No person under the age of 12 years may operate a snowmobile unless the person is accompanied either by a parent or guardian or by a person over 18 years of age.

(2) Persons aged 12 and older; snowmobile safety certificates and program.

(a) No person who is at least 12 years of age and who is born on or after January 1, 1985, may operate a snowmobile unless he or she holds a valid snowmobile safety certificate.

(b) Any person who is required to hold a snowmobile safety certificate while operating a snowmobile shall carry proof that the person holds a valid safety certificate and shall display such proof to a law enforcement officer on request.

(c) Persons enrolled in a safety certification program approved by the department may operate a snowmobile in an area designated by the instructor.

(3) Exceptions. This section does not apply to the operation of snowmobiles upon lands owned or leased by the operator’s parent or guardian. As used in this section, “leased lands” does not include lands leased by an organization of which said operator or the operator’s parent or guardian is a member.

(4) Definition. For purposes of this section, “accompany” means to be on the same snowmobile as the operator.