南达科他州共和党定于周二举行州长初选决胜轮，参选者为州长Larry Rhoden和商人Toby Doeden[1]。两人在6月2日初选中领跑，但均未达到赢得提名所需的35%票数门槛，Toby Doeden获约31%，Larry Rhoden获约25%[1]。同日初选中，Dusty Johnson和Jon Hansen分别获得约23%和约21%的支持[1]。
决胜轮的胜者将在11月大选中对阵民主党前州参议员Dan Ahlers[1]。作为自1970年代以来从未出现过民主党州长的共和党州，南达科他州的共和党提名者在大选中具有显著优势[1]。截至6月1日，南达科他州注册共和党人数约为322,000人，6月2日初选的投票人数约为136,000人[1]。投票截止时间为当地时间晚7点（中部时间晚8点、山地时间晚9点）[1]。前州长Kristi Noem于2025年初离职，加入了唐纳德·特朗普内阁[1]。
South Dakota Republicans will participate in a gubernatorial primary runoff on Tuesday to choose between state Governor Larry Rhoden and businessman Toby Doeden [1]. The two candidates advanced to the runoff after finishing as the top vote-getters in the June 2 primary election, though neither secured the 35% threshold required to win the party's nomination outright [1]. Doeden led the initial primary with approximately 31% of the vote, while Rhoden finished second with roughly 25%, followed by candidates Dusty Johnson at about 23% and Jon Hansen at approximately 21% [1].
The runoff winner will face Democrat Dan Ahlers, a former state senator, in the November general election [1]. Republicans maintain a commanding advantage in South Dakota, which has not elected a Democratic governor since the 1970s [1]. The vacancy arose after former Governor Kristi Noem departed the office earlier in 2025 to join Donald Trump's cabinet [1]. Voting in Tuesday's runoff will conclude at 7 p.m. local time [1].