Primary Elections
South Dakota Primary Elections 2026
Primary date, filing deadlines, key contested races, and what to watch in South Dakota ahead of the 2026 general election.
June 2, 2026
Primary Date
None
Runoff / RCV
March 2026
Filing Deadline
Low — Safely Republican
Competitiveness
Key 2026 Primary Races
| U.S. Senate | John Thune (R) — Thune became Senate Majority Leader, up in 2028 |
| Governor | Kristi Noum (R) up 2026 |
| U.S. House | SD at-large (Dusty Johnson) safe Republican |
2026 Primary Overview
South Dakota is safely Republican. Governor Noem faces re-election after her failed presidential run and controversial statements. She may face a primary challenge from within the Republican party.