The U.S. Supreme Court ruled 6-3 on Tuesday that states may bar biological males from competing in women's and girls' sports, upholding laws in West Virginia and Idaho that require student-athletes to compete on teams matching their biological sex at birth. The decision settles a legal fight that has worked its way through federal courts for years, and hands a clear victory to the 29 states that have enacted such protections.
Justice Brett Kavanaugh authored the majority opinion, as Breitbart reported, writing that "the Constitution and Title IX do not require an overhaul of women's and girls' sports throughout America." The Court held that the word "sex" in Title IX refers to biological sex and that laws restricting female athletic competition to biological females satisfy constitutional scrutiny.
The ruling consolidates two cases, West Virginia v. B.P.J. and Little v. Hecox, both brought by transgender athletes who challenged state laws barring them from girls' teams. Lower courts had previously blocked both laws. The Supreme Court agreed to hear the cases last July, and oral arguments took place on January 13, 2026.
The majority opinion, as Fox News Digital reported, stated plainly:
"Consistent with Title IX and the Equal Protection Clause, we hold that the States may maintain women's and girls' sports for biological females. They may determine eligibility for women's and girls' sports based on biological sex."
Justices Sonia Sotomayor, Elena Kagan, and Ketanji Brown Jackson dissented in part. Sotomayor filed an opinion concurring in the judgment in part and dissenting in part, joined by Kagan and Jackson. Jackson also filed a separate opinion. In her dissent, Sotomayor argued that "we just simply do not know scientifically that transgender students pose dangers," AP News reported.
That argument may satisfy faculty-lounge sensibilities, but it sidesteps what the majority recognized: the physiological advantages conferred by male puberty are not a matter of scientific mystery. They are the entire reason Title IX created sex-separated athletic programs in the first place.
The ruling does not impose a nationwide ban. It allows individual states to set their own policies, creating what the New York Post described as a patchwork system, similar to the state-by-state landscape that followed the Dobbs abortion decision. Twenty-seven states beyond West Virginia and Idaho already have similar laws on their books, including Florida and Texas. Twenty-three states, among them California, New York, and Massachusetts, do not. Some of those states have laws actively protecting transgender athletes' participation in girls' sports.
Kavanaugh's opinion struck a deliberate tone on the human dimension. He wrote that "sports are highly competitive and generally zero sum. Women and girls who play sports care deeply about all of those things." But he also added a line that cut against the culture-war caricature:
"No student-athlete on either side of the issue, whether a biological female or transgender, deserves to be ostracized or vilified."
Justice Clarence Thomas went further in a concurrence. He declared that "men and boys with gender dysphoria are not women or girls, even if they believe that they are," the New York Post reported. Where Kavanaugh's opinion deferred to states and the democratic process, Thomas laid down a sharper marker.
The Washington Examiner noted that the ruling builds on last year's decision in United States v. Skrmetti, extending the Court's willingness to let legislatures draw lines based on biological sex. Kavanaugh wrote that under Title IX, "West Virginia may limit women's and girls' sports teams to biological females," and that such laws satisfy rational basis review or intermediate scrutiny under the Equal Protection Clause.
The West Virginia case centered on Becky Pepper-Jackson, a transgender athlete who sued the state while in middle school in 2021, challenging West Virginia's Save Women's Sports Act. The case wound through the courts for years. During that time, Pepper-Jackson recently won a girls' track and field state championship in shot put, competing under a court order that had blocked the state law.
The Idaho case involved Lindsay Hecox, a transgender athlete who sought to run women's track and cross-country at Boise State University, challenging Idaho's Fairness in Women's Sports Act. Idaho was the first state in the nation to pass such a law.
Hecox's case took a peculiar turn in the months before oral arguments. Cooley Legal, representing Hecox, filed a suggestion of mootness, arguing that Hecox's expected graduation would render the case irrelevant. In the filing, Hecox stated: "I am currently enrolled in classes that may allow me to graduate as early as May 2026."
Idaho wasn't buying it. The state's solicitor general, Alan Hurst, called the claimed graduation date "not possible" during oral arguments, after Idaho's leadership conducted what was described as "back-door digging" into Hecox's enrollment status. Hecox's own attorney, Kathleen Hartnett of Cooley Legal, ultimately conceded during arguments that her client was "unlikely to graduate by May" and was "hoping to make, through summer credits, to graduate in the fall."
Alliance Defending Freedom legal counsel John Bursch, who worked with both state attorneys general on the case, told Fox News Digital that Boise State, as a state institution, confirmed Hecox's spring graduation was unlikely. "It just shows that throughout the case, Hecox has flipped back and forth," Bursch said.
Idaho Attorney General Raul Labrador told Fox News Digital the graduation discrepancy mattered. "I think it's important. I don't think it's the main issue in the case, but I think it's important."
The oral arguments on January 13 exposed a fundamental weakness in the challengers' legal position. ACLU attorney Joshua Block, representing Pepper-Jackson, urged the Court away from defining "sex" at all. "I really urge the court not to do it on the definition of sex argument," Block said.
Chief Justice John Roberts pressed the point, insisting that sex "must mean something." Block eventually conceded ground, telling the Court: "I think for this case, you can accept, for the sake of this case, that we're talking about what they've termed to be biological sex."
That concession was telling. The entire legal theory behind allowing biological males into women's sports rests on the claim that "sex" in federal law encompasses gender identity. When the ACLU's own lawyer declined to defend that definition before the highest court in the land, the writing was on the wall. Fox News Digital reported that Block declined to give a definition of "sex" to a reporter after the hearing.
West Virginia Attorney General John McCuskey 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." He added:
"Today's Supreme Court decision affirms what common sense and the law have long made clear: states have the right to designate sports teams based on biological sex, not gender identity. Without that delineation, Title IX is turned on its head and decades of hard-fought progress to advance female athletes is erased."
Labrador said Idaho's pioneering role was vindicated. "Idaho led the nation by becoming the first state to protect women's sports, and I've never wavered in defending that law," he stated. "The Supreme Court has now confirmed that states can preserve fair competition and protect the opportunities that generations of women fought to secure."
Education Secretary Linda McMahon framed the ruling in broader policy terms, saying it "affirms the common sense right of states to prohibit men from competing in women's sports, safeguard the integrity of female spaces, and ensure no woman faces discrimination on the basis of sex." McMahon credited the Trump Administration with fighting "to restore Title IX's protections for women and girls since Day One" and said the ruling "cements those reforms."
The ruling validates existing laws in 29 states. It does not compel the remaining 23 to follow suit. States like California, New York, and Massachusetts remain free to allow biological males to compete in women's sports, and some already have laws on the books doing exactly that.
That means the practical impact will be felt unevenly. A female high school runner in Idaho now has the full backing of the Supreme Court protecting her competitive category. A female high school runner in California does not. The Court left that choice to the democratic process, and the democratic process in deep-blue states has gone the other way.
Several questions remain. The ruling's full text, including the reasoning behind the partial dissents and any concurrences beyond Thomas's, will shape how future challenges play out. National Review noted that the decision aligns with broader legislative trends and a Trump executive order restricting transgender participation in women's sports, suggesting the political and legal momentum is firmly on the side of biological-sex-based eligibility.
It also remains to be seen whether the ruling prompts new legislation in states that have not yet acted. With the Court's imprimatur now firmly behind sex-based athletic eligibility, lawmakers in swing states may find the political ground has shifted beneath them.
This case took five years to reach the Supreme Court. Pepper-Jackson filed suit as a middle schooler in 2021. The cases stalled at the appellate level for years before the Court finally agreed to hear them. In the meantime, state laws were blocked, biological males competed in girls' events, and female athletes were left without legal recourse.
Tuesday's ruling ends that limbo for more than half the country. For the girls and women who train, compete, and sacrifice to earn their place on the field, the Court affirmed what they already knew: biology is not a policy preference. It is the reason women's sports exist.
Title IX was written to give women a fair shot. The Supreme Court just confirmed that fair means fair.
