The Supreme Court ruled Tuesday that states have the constitutional authority to bar transgender athletes from competing on girls’ and women’s school sports teams. The 6-3 ruling upheld laws in Idaho and West Virginia and, by extension, validated similar statutes already on the books in more than two dozen other states across the country. Justice

The Supreme Court ruled Tuesday that states have the constitutional authority to bar transgender athletes from competing on girls’ and women’s school sports teams. The 6-3 ruling upheld laws in Idaho and West Virginia and, by extension, validated similar statutes already on the books in more than two dozen other states across the country.
Justice Brett Kavanaugh, who has spent years coaching his own daughters’ basketball teams, wrote the majority opinion. Kavanaugh made clear that neither the Constitution nor federal civil rights law requires what he described as an overhaul of women’s and girls’ sports throughout the country. The ruling held that because Title IX explicitly allows schools to maintain separate athletic teams based on sex, states remain free to define eligibility for those teams according to biological sex at birth.
The two cases decided together, Little v. Hecox out of Idaho and West Virginia v. B.P.J., had taken markedly different paths through the lower courts before reaching the Supreme Court.
In the Idaho case, the Ninth Circuit had sided with a transgender athlete seeking to compete on the Boise State University women’s track team, ruling that the state’s Fairness in Women’s Sports Act violated the Equal Protection Clause. In the West Virginia case, the Fourth Circuit had ruled against the state on different grounds, finding its law violated Title IX.
The Supreme Court firmly rejected both lower court rulings, siding with the states in a decision that reaffirms the authority of legislatures to set eligibility rules for school athletics based on biological sex rather than gender identity. Kavanaugh’s opinion emphasized that states have vitally important interests in safety and competitive fairness, interests he said are substantially related to the sex-based classifications at issue in both laws.
West Virginia Attorney General John McCuskey, who argued to defend his state’s law, called the decision a monumental victory for every female athlete who has ever competed or dreamed of competing on a fair and safe playing field. McCuskey said the ruling affirms what common sense and the law have long made clear: that states retain the right to designate sports teams based on biological sex rather than gender identity and that failing to do so would turn Title IX on its head after decades of hard-fought progress for female athletes.
President Trump praised the decision in characteristically direct terms, posting on Truth Social that the Supreme Court had ruled against men playing in women’s sports and calling it a big win. Trump’s reaction reflected a broader sense of vindication among conservatives who have pushed for years, at both the state and federal levels, to keep biological sex as the standard for eligibility in women’s athletics.
The ruling builds directly on the Court’s decision last year upholding a Tennessee law barring medical professionals from providing certain gender-related treatments to minors. Since that earlier ruling, a total of 25 states have moved to restrict or ban such treatments for minors, and Tuesday’s decision on athletics adds another significant victory to a broader legal trend in which the Court’s conservative majority has consistently sided with states seeking to protect children from what critics have long described as ideologically driven policy experiments.
Justice Clarence Thomas went further than the majority opinion in a forceful concurrence, writing plainly that a man does not have a legal right to compete against women simply because he believes himself to be a woman. Thomas argued that sex is an immutable biological characteristic and that the categories of man and woman constitute a binary classification, language that drew praise from advocates who have long argued that biological reality, not subjective identity, should govern eligibility in athletic competition.
Idaho Governor Brad Little, whose state’s Fairness in Women’s Sports Act was one of the two laws at issue, had defended the statute as necessary given the average real differences between the sexes that justify preserving separate categories in athletic competition. Tuesday’s ruling validates that framing at the highest judicial level, giving Idaho and the 26 other states with similar laws on the books newfound confidence their statutes will withstand further legal challenges.
During oral arguments in January, several justices signaled clear skepticism toward the transgender athletes’ legal position. Kavanaugh in particular questioned why the Court should intervene to impose a single nationwide rule on an issue where states themselves remain divided, noting that some states allow transgender athletes to compete in girls’ and women’s sports while others do not. That line of questioning foreshadowed Tuesday’s outcome, in which the Court affirmed that states retain the authority to set their own eligibility rules grounded in biological sex.
The case also featured a notable exchange during oral arguments when an attorney representing the West Virginia plaintiff argued that the legal definition of sex itself should not be firmly established, a position that visibly gave several justices pause.
That attorney reportedly declined to elaborate further on the argument when pressed by reporters following the hearing, a moment that became a rallying point for conservative commentators covering the case in the months that followed.
Fox News coverage of the ruling highlighted that the decision validates and protects the 27 other state laws passed in recent years to keep biological males out of women’s sports, calling it a massive victory for the Save Women’s Sports movement and the conservative lawmakers who championed state-level legislation long before the issue reached the Supreme Court.
Not every justice signed on to every aspect of the majority’s reasoning, and the opinion was notably careful to leave several related questions for future cases. Kavanaugh’s opinion did not address whether states may extend similar protections to younger children in grammar school settings.
The ruling likewise left open questions about club sports and recreational leagues that fall outside the traditional varsity school sports context at issue in the Idaho and West Virginia cases, suggesting further legal battles and further opportunities for state legislatures to act may still lie ahead.
Those unresolved questions all but guarantee that further litigation on the issue will continue to work its way through the lower courts in the years ahead, even as Tuesday’s ruling settles the core question for interscholastic and intercollegiate varsity athletics.
Legal analysts on the right note the ruling gives Idaho and West Virginia, along with the many other states that have passed similar laws in recent years, a strong constitutional foundation to defend those statutes going forward.
The decision represents the culmination of a years-long legal battle that began well before the Supreme Court agreed to take up the case last summer.
Both the Idaho and West Virginia laws had been blocked by federal appeals courts for years before the Supreme Court intervened, meaning transgender athletes had been permitted to compete under both states’ original, more permissive rules for an extended period while the litigation dragged on.
Reaction outside the Supreme Court building on the day of the ruling reflected the deeply personal stakes many Americans attach to the case.
Activists supporting the state laws, including groups affiliated with the Save Women’s Sports movement, celebrated openly on the court steps, with longtime advocates describing the moment as validation of years of grassroots organizing at the state legislative level that finally culminated in a definitive win at the nation’s highest court.
Tennis legend Martina Navratilova has been among the most prominent athletic voices arguing publicly for years that biological differences created by male puberty confer lasting physical advantages that cannot be fully offset even with hormone therapy, a position that Tuesday’s ruling effectively vindicates at the constitutional level for scholastic athletics nationwide.
For supporters of women’s sports protections, Tuesday’s ruling represents the culmination of years of advocacy at the state legislative level finally being validated by the nation’s highest court.
With 27 states now holding laws the Supreme Court has effectively blessed as constitutional, advocates argue the decision provides lasting clarity and legal certainty for female athletes, coaches, and school administrators across the country going forward, ensuring fairness and safety for generations of young women to come.