Wyo. Stat. § 31-2-707: Exemptions.

(a) Off-road recreational vehicles owned or used by a governmental agency are exempt from this article.

(b) In addition to subsection (a) of this section, the off-road recreational vehicle trail user registration required under this article may be waived on an annual basis by the director of the department of state parks and cultural resources for any area designated by the department through a cooperative agreement whereby other governmental agencies agree to contribute to the off-road recreational vehicle trail maintenance and grooming for that area.

(c) Off-road recreational vehicles, when being operated for agricultural use, including but not limited to irrigation, fencing or moving livestock, are exempt from this article.