S.D. Codified Laws § 11-2-10
If a county is conducting or in good faith intends to conduct studies within a reasonable time, or has held or is holding a hearing for the purpose of considering a comprehensive plan, the board in order to protect the public health, safety, and general welfare may adopt as emergency measures a temporary zoning ordinance and map and a temporary subdivision ordinance, the purposes of which are to classify and regulate uses and related matters as constitutes the emergency. Before adoption or renewal of the emergency measure or measures, the board shall hold at least one public hearing. Notice of the time and place of the hearing shall be given once at least ten days in advance by publication in a legal newspaper of the county. Any emergency measure is limited to one year from the date it becomes effective and may be renewed for one year. In no case may such a measure be in effect for more than two years.
SDCL 11-2-10