Which specific US Senate seats are up for election in 2025?

1. Why 2025 is normally an off-year for the Senate — the calendar that matters

The U.S. Senate is divided into three classes with staggered six-year terms, and the Class 2 seats were contested in 2024 and are next due in 2030, while Class 1 and Class 3 rotate on their own six‑year cycle. That schedule means there are no routine, nation‑wide, regularly scheduled Senate elections in 2025; the next full cycle of regularly scheduled Senate contests is in 2026 ^{[3] [4]}. Multiple sources reviewed emphasize that the publicly maintained election tables are updated after state nominating processes conclude; none list a slate of 2025 regular Senate contests because the cycle does not call for them ^[2].

2. Special elections are the only path for 2025 Senate contests — what to watch for

Senate seats can be filled midterm by gubernatorial appointment or by special election when a senator resigns, dies, or otherwise vacates the seat. Historical compilations and procedural summaries show a long track record of special elections being used to fill vacancies ^[5]. The sources make clear that any 2025 Senate contests would be situational, dependent on state law and the timing of vacancies; states vary in whether governors appoint temporary replacements and when they schedule special elections. As of the latest aggregated reporting, no comprehensive, confirmed list of 2025 special Senate elections exists ^[2].

3. Conflicting or misread claims — parse the examples carefully

One item in the compiled analyses suggests Florida and Ohio seats could be involved in special contests, but that material actually refers to later special elections and does not identify any confirmed 2025 contests ^[6]. Other sources repeatedly note that the candidate and jurisdiction tables are still being updated and that no jurisdictions had completed nominating processes for elections in that cycle, reinforcing that there is no settled slate of 2025 Senate elections ^[2]. The pattern in these documents indicates confusion arises when special‑election timelines or appointments are conflated with regularly scheduled cycles.

4. Ground truth for a straight answer: none scheduled, only contingency races possible

Based on the reviewed materials, the accurate, evidence‑based answer is that there are no scheduled U.S. Senate seats up for regular election in 2025; only special elections could occur if a vacancy requires one, and the datasets and election trackers reviewed do not list any confirmed 2025 special Senate contests at this time ^{[1] [2]}. The U.S. Senate’s staggered calendar and the reporting on nomination processes and electoral class tables support this clear conclusion ^{[3] [4]}.

5. Practical next steps and where jurisdictions will report changes

Because special elections are driven by state actions and by the timing of vacancies, the authoritative updates will come from state election offices, secretary of state pages, and the Senate’s elections/administrative trackers once a vacancy occurs and a date is set; election aggregation tables are updated after nominating processes conclude ^[2]. Historical lists and procedural references demonstrate how quickly special‑election schedules can change after a vacancy is created, so monitoring those official state and Senate trackers is necessary to catch any 2025 special contests as they are announced ^{[5] [2]}.

6. What the record shows about 2026 and why that matters for context

Several reviewed records emphasize that the major block of Senate contests is in 2026 (Class 2 and some Class 3 considerations) and some reporting about retirements and open seats pertains directly to 2026 planning rather than 2025 campaigning ^[4]. That context helps explain why many outlets focus their candidate tables and projections on 2026, leaving 2025 unpopulated except for contingency entries; the absence of scheduled 2025 Senate contests reflects the normal calendar rather than an omission by trackers, and any future 2025 contests will be special elections added to those trackers when state authorities set dates ^{[4] [2]}.