S.D. Codified Laws § 9-30-3.1
A municipality must allow a campaign sign to be placed on private property in a residential, business, commercial, or industrial zone adjacent to a transportation right-of-way by or with the permission of the property owner beginning no later than ten days prior to the day when absentee voting in a primary or general election begins, and must allow the campaign sign to continue to be displayed through election day. A campaign sign displayed pursuant to this section must be removed within the seven days following the election. A municipality may regulate the use of campaign signs pursuant to § 9-30-3 in any manner that does not conflict with this section or applicable law.
For the purposes of this section, the term, campaign sign, means a free-standing object identifying and urging a person to vote for or against a particular ballot question or candidate for public office.
SDCL 9-30-3.1