The U.S. Supreme Court ruled 6-3 on Tuesday to uphold laws in West Virginia and Idaho that prohibit transgender female athletes from competing on girls’ and women’s sports teams. The decision, which affirms the authority of states to define athletic eligibility based on “biological sex” as determined at birth, sets a legal precedent affecting more than two dozen other states with similar restrictions and impacts athletes at the school and collegiate levels nationwide.

The cases were brought by transgender athletes Becky Pepper-Jackson, a high school student from West Virginia, and Lindsay Hecox, a college student from Idaho, who challenged their states’ laws on constitutional and Title IX grounds. They argued that the bans unfairly discriminate against transgender girls by denying them access to participate in girls’ sports programs. The lower courts had blocked enforcement of the laws for the duration of the litigation, allowing Pepper-Jackson to compete on her high school track team, but Tuesday’s ruling reverses that.

Justice Brett M. Kavanaugh, writing for the conservative majority, emphasized that the Constitution and Title IX do not require the overhaul of girls’ sports and upheld states' rights to preserve fairness and opportunities for cisgender female athletes. He acknowledged the importance of respecting transgender athletes but maintained that allowing transgender females to compete against biological females can displace or disadvantage the latter. The ruling clarifies that the laws do not amount to a nationwide ban, leaving open the question of policies in states where transgender athletes are currently permitted to participate.

The court's three liberal justices dissented, expressing concern that the majority prematurely ended the challenge without allowing further factual development, particularly regarding whether transgender athletes who have not undergone male puberty hold an unfair advantage. Justice Sonia Sotomayor wrote that the ruling effectively denies transgender athletes the benefits of sports participation based on assumptions rather than evidence and called for judicial restraint given the complexity of the issue.

The decision aligns with a pattern of recent Supreme Court rulings that have curtailed certain transgender rights. Earlier rulings have upheld bans on gender-transition treatments for minors and allowed enforcement of a military ban on transgender service members. Supporters of the bans, including former President Donald Trump and West Virginia Governor Patrick Morrisey, praised the ruling as a significant victory for women’s athletics. Trump described it as a “BIG WIN,” while Morrisey hailed it as protecting fairness and opportunity for future generations of female athletes.

Conversely, advocates for transgender rights expressed deep disappointment. Joshua Block, an attorney with the American Civil Liberties Union representing the plaintiffs, called the outcome “heartbreaking” for transgender girls seeking equal opportunities. The Human Rights Campaign acknowledged the ruling as part of a series of conservative Supreme Court decisions that have rolled back protections for marginalized groups but encouraged states to pursue inclusive policies.

The issue remains politically charged, with 27 states—primarily with Republican-led legislatures—having enacted similar bans while some Democrat-led states continue to uphold inclusive participation rules. Conservative advocacy groups have indicated plans to press forward with campaigns in states that currently allow transgender athletes to compete on women’s teams.

Tuesday’s ruling leaves unresolved numerous questions about how courts and legislatures nationwide will address transgender participation in sports, underscoring the ongoing debate over the balance between inclusion and competitive fairness in athletics.