The NCAA Division I Men's Basketball Tournament, commonly known as March Madness, is a single-elimination tournament featuring 68 teams. The selection committee assigns the top four teams overall to regional brackets as #1 seeds. These seeds are determined by a combination of win-loss record, strength of schedule, quality of wins, and other metrics like the NET ranking, which replaced the RPI in 2018. The 2027 tournament will be the 88th edition. For the 2027 tournament, the #1 seeds will be announced on Selection Sunday, March 14, 2027. The tournament begins with the First Four on March 16 and ends with the Final Four on April 3 and 5 at Ford Field in Detroit, Michigan. This is the second time Detroit has hosted the Final Four, the first being in 2009. The 2027 #1 seeds prediction market on Kalshi allows traders to bet on which teams will earn those top spots. The market resolves to Yes if a specified team is selected as a #1 seed. Teams that have been consistent contenders in recent years include Gonzaga, Kansas, Duke, North Carolina, Purdue, Houston, and Arizona. The 2026 tournament saw Auburn, Duke, Florida, and Houston as #1 seeds. The 2027 race is wide open due to expected roster turnover and the transfer portal. The market closes early if the event occurs, meaning when the selection committee announces the bracket. Interest in this market comes from college basketball fans, sports bettors, and traders who follow sports prediction markets. Kalshi is a regulated prediction market platform, and this market is not officially connected with the NCAA.

Historical Context

The concept of #1 seeds in the NCAA tournament dates back to 1979, when the field expanded to 40 teams. The first four #1 seeds were Indiana State, UCLA, Notre Dame, and Michigan State. That year, Michigan State, led by Magic Johnson, won the national championship. Since then, #1 seeds have won the national championship 22 times out of 44 tournaments (50%). The most recent #1 seed to win it all was UConn in 2023. In 2024, UConn became the first #1 seed to repeat as champion since Florida in 2007. The selection committee has refined its seeding criteria over time. In 2018, the NET (NCAA Evaluation Tool) replaced the RPI as the primary sorting metric. The NET incorporates game results, strength of schedule, game location, net offensive and defensive efficiency, and the quality of wins and losses. The committee also uses quadrant system to categorize wins: Quadrant 1 (home vs. teams ranked 1-30, neutral vs. 1-50, away vs. 1-75), Quadrant 2 (home vs. 31-75, neutral vs. 51-100, away vs. 76-135), and so on. Historically, certain conferences have dominated #1 seeds. The ACC has the most #1 seeds all-time with 59, followed by the Big Ten (47), Big East (38), and Big 12 (31). The SEC has 18, but has had a resurgence in recent years. In 2024, the SEC had two #1 seeds (Auburn and Florida) for the first time since 2015. The 2027 tournament will be the 88th edition. The last time the Final Four was held in Detroit was 2009, when North Carolina won the title. The 2027 Final Four will be at Ford Field, which has a capacity of over 70,000. The tournament field expanded to 68 teams in 2011, adding the First Four games. The selection committee has 12 members who serve staggered five-year terms. The committee chair for 2027 has not been announced, but the 2026 chair was Greg Byrne.