S.D. Codified Laws § 12-1-3.1
For the purposes of this title, the term, alternative political status, means that a political party meets the requirements of this section commencing with the 2014 general election and each general or special statewide election thereafter. Any political party that meets the definition of political party as defined in § 12-1-3 and has a total party registration of less than two and a half percent of the total number of registered voters, as recorded at the Office of the Secretary of State on the date of the last general election, shall receive alternative political status. Any party that has a total party registration of two and a half percent or more of the total number of registered voters, as recorded at the Office of the Secretary of State on the date of the last general election, shall no longer be classified as alternative political status, but shall remain a political party for the next two general election cycles.
SDCL 12-1-3.1