Iowa Republican Caucus 2028

What this countdown tracks

The Iowa Republican Party is expected to hold its first-in-the-nation presidential caucus on January 15, 2028, kicking off the 2028 GOP nominating calendar. Iowa Democrats, meanwhile, are moving their contest to a mail-in presidential preference window following the 2024 DNC calendar overhaul that demoted Iowa from its traditional lead-off slot.

Background

The Iowa GOP caucuses have opened every Republican presidential nominating cycle since 1976, with in-person precinct gatherings that award delegates proportionally after a straw poll. The 2024 cycle saw a record-cold January 15 caucus won by Donald Trump with 51.0% over Ron DeSantis and Nikki Haley. On the Democratic side, the DNC's 2024 calendar — formalized in December 2022 — replaced Iowa with South Carolina as the first sanctioned primary, ending a half-century tradition that began with the 1972 reforms following the 1968 Chicago convention. Iowa Democrats responded by shifting to a mail-in presidential preference card process conducted over several weeks. Ballotpedia's tracker of 2028 Democratic calendar changes notes continuing tension between state law — which still privileges Iowa's caucus-first status — and DNC rules that penalize delegations from states holding contests out of order. For 2028, Iowa Republicans have publicly signaled they will retain an in-person caucus on a Monday evening in mid-January, the customary format, while the exact date will be set by the Iowa GOP State Central Committee approximately 90 days before the event. The Iowa straw poll traces to 1976, when Jimmy Carter's second-place finish behind "uncommitted" established the state's outsized role in winnowing presidential fields.

Why the date matters

January 15, 2028 is a Saturday — an unusual caucus day for Iowa, which traditionally holds contests on Mondays. The date presented here tracks the most widely reported scheduling target; the Iowa Republican Party will confirm or adjust during the fall of 2027. The day matters because New Hampshire's state law requires its primary to come at least seven days before any "similar" contest, and the Nevada GOP caucus, South Carolina GOP primary, and Super Tuesday on March 7 follow in rapid succession. The Iowa result historically culls the Republican field within 72 hours. Since 1976, the eventual Republican nominee has won Iowa in eight of the thirteen contested cycles, and candidates finishing below third place have dropped out within a week in roughly 70% of cases.

What to watch for

• Final caucus date confirmation from the Iowa GOP State Central Committee in autumn 2027.
• Weather contingencies — Iowa caucuses can hinge on precinct attendance in single-digit temperatures.
• Field size: how many declared Republican candidates reach the Iowa State Fair Soapbox in August 2027.
• Straw-poll margins and the order of the top three finishers.
• Viability thresholds and how precinct delegates allocate inside county conventions.
• Democratic mail-in preference window dates set by the Iowa Democratic Party.
• Media calls in the first 90 minutes after precincts close.
• Evangelical turnout in the western Iowa counties that anchored the 2016 Cruz win and the 2024 Trump coalition.
• Spending reports from the final pre-caucus FEC filing window in early January 2028.

Calendar mechanics

Iowa's first-in-the-nation status rests on Iowa Code § 43.4, which requires the state's caucuses to be held "at least eight days earlier than the scheduled date of any meeting, caucus, or primary" in any other state. New Hampshire's RSA 653:9 similarly mandates its primary be held at least seven days before any similar election. The interlocking statutes have produced a leapfrog dynamic in prior cycles, most dramatically in 2008 and 2012. For 2028, both states are expected to preserve their respective slots for the Republican calendar, while the DNC-sanctioned Democratic calendar starts later in South Carolina and Nevada.

Related events to track

The caucus is the opening bell in a calendar that culminates in the US 2028 Presidential Election and follows directly on the heels of the Trump 45 records FOIA eligibility milestone five days later. Delegates and donors also watch the US 2026 Midterm Elections results as a leading indicator of the Republican field's shape.

FAQ

When exactly is the 2028 Iowa GOP caucus? Currently tracked for Saturday, January 15, 2028, pending final confirmation from the Iowa GOP State Central Committee in late 2027.

Is the caucus date confirmed or expected? Expected — the Iowa GOP will formally set the date in late 2027 after consulting with New Hampshire and Nevada on calendar coordination.

Who is responsible for the caucus? The Republican Party of Iowa, through its State Central Committee and 1,657 precincts, with volunteer precinct captains running the in-person gatherings.

Where can I read the official 2028 calendar tracker? Ballotpedia covers ongoing calendar changes at https://ballotpedia.org/Changes_to_the_2028_Democratic_presidential_primary_calendar.