Missouri primary election set for Aug. 4, with four constitutional amendments on ballot

Missouri voters are scheduled to cast ballots Tuesday, Aug. 4, in the state’s 2026 primary election, which will select party nominees for major federal, state and local offices before the Nov. 3 general election.

The statewide vote also includes four constitutional amendments. Gov. Mike Kehoe signed proclamations placing the measures on the Aug. 4 primary ballot, according to a June 3 announcement from his office.

The measures are identified as Amendment 1, Amendment 2, Amendment 4 and Amendment 5. Their placement on the ballot means they are before voters for approval; the proclamations themselves did not decide the questions.

Statewide ballot and election timeline

The Missouri Secretary of State’s 2026 election calendar lists Aug. 4 as the primary election date and identifies election and filing deadlines for the cycle. The next statewide election date listed is Tuesday, Nov. 3, when the general election is scheduled.

That sequence is important procedurally. The Aug. 4 primary is the immediate decision point for party nominations, while the Nov. 3 election follows for the general-election stage. The constitutional amendments, however, are on the primary ballot for a direct vote by Missouri voters.

No outcome can be known before ballots are cast and election results are released. As of Aug. 3, the assignment date, results were not available. The approved materials do not support reporting any winner, amendment result, turnout figure or vote margin in advance of the election.

Information available for St. Louis voters

In the city of St. Louis, the Board of Election Commissioners provides election dates, filing deadlines and an official August 2026 candidate list. Those materials identify candidates who have filed for the city’s applicable contests and provide election-administration information ahead of the primary.

St. Louis-area voters will encounter contests in addition to the statewide constitutional questions. The approved source packet states that St. Louis County has published an August 2026 ballot covering county, legislative and other contests, although the state announcement on the amendments does not enumerate every race affecting the area.

Voters should therefore distinguish among the ballot’s separate functions: choosing party nominees in primary contests, voting directly on the four statewide amendments, and considering the local contests listed by the relevant election authority. Candidate and filing information published by the St. Louis Board of Election Commissioners applies to the city’s election administration materials, while statewide dates come from the Secretary of State’s calendar.

What happens next

The next scheduled event is the Aug. 4 primary. Results from that election will determine the nominees who proceed toward the Nov. 3 general election and will establish the vote on Amendments 1, 2, 4 and 5. Official results and subsequent election administration will be required before outcomes can be reported.