S.D. Codified Laws § 32-20A-6 (2026)
A duly registered and licensed snowmobile may be operated in the right-hand or left-hand ditch on state designated snowmobile trails, and in the right-hand ditch outside the roadway of other than interstate highways, but not upon or across any highway except as provided by § 32-20A-7. A violation of this section is a Class 2 misdemeanor.
Source: SL 1971, ch 182 , § 5; SL 1986, ch 260 ; SL 1989, ch 255 , § 118; SL 1996, ch 204 , § 2.