WASHINGTON • The U.S. Supreme Court on Tuesday upheld state laws barring transgender girls and women from playing on school athletic teams.

The court’s conservative majority ruled that state bans in Idaho and West Virginia don’t violate the U.S. Constitution or the federal law known as Title IX, which prohibits sex discrimination in education.

“The States argue — and the Court agrees — that the interests of safety and competitive fairness are important interests for purposes of equal protection analysis. And the States’ sex-based classification — limiting women’s and girls’ sports to biological females — is substantially related to those interests,” the court said.

“The underlying medical and scientific premise of the equal protection challenge here is that at least some biological males who identify as female and take puberty blockers or hormones do not retain physical advantages over biological females. That premise is the subject of ongoing medical and scientific debate. Even if true, that empirical claim would not alter the equal protection conclusion set forth above,” the court added.

More than two dozen other Republican-led states have adopted bans on female transgender athletes, and the decision seems certain to extend to them as well.

Left unresolved by the outcome are lawsuits challenging state laws and regulations in Connecticut, California and elsewhere that permit transgender athletes to compete consistent with their gender identity.

Becky Pepper-Jackson, a 16-year-old high school sophomore in Bridgeport, West Virginia, has been taking puberty-blocking medication, has publicly identified as a girl since age 8 and has been issued a West Virginia birth certificate identifying her as female. She is the only known transgender person who has sought to compete in girls sports in West Virginia.

Pepper-Jackson was a back-of-the-pack cross-country runner in middle school and won statewide champion in the shot put. She beat the second-place finisher by 2 feet in last month’s West Virginia championship meet.

In the Idaho case, Lindsay Hecox sued over the state’s first-in-the-nation ban for the chance to try out for the women’s track and cross-country teams at Boise State University in Idaho. She didn’t make either squad because “she was too slow,” her lawyer, Kathleen Hartnett, told the court during arguments in January, but she competed in club-level soccer and running.

Prominent women in sports have weighed in on both sides. Tennis champion Martina Navratilova, swimmers Summer Sanders and Donna de Varona and beach volleyball player Kerri Walsh Jennings are supporting the state bans. Soccer stars Megan Rapinoe and Becky Sauerbrunn and basketball players Sue Bird and Breanna Stewart back the transgender athletes.

In 2020, the Supreme Court ruled LGBTQ people are protected by a landmark federal civil rights law that prohibits sex discrimination in the workplace, finding that “sex plays an unmistakable role” in employers’ decisions to punish transgender people for traits and behavior they otherwise tolerate.

Last year, the six conservative justices on the nine-member court declined to apply the same sort of analysis when they upheld state bans on gender-affirming care for transgender minors.

The states supporting the prohibitions on transgender athletes argued there is no reason to extend the ruling barring workplace discrimination to Title IX.

Idaho’s law, state Solicitor General Alan Hurst said, is “necessary for fair competition because, where sports are concerned, men and women are obviously not the same.”

Lawyers for Pepper-Jackson argued that such distinctions generally make sense but that their client has none of those advantages because of the unique circumstances of her early transition. In Hecox’s case, her lawyers wanted the court to dismiss the case because she had forsworn trying to play on women’s teams.

NCAA president Charlie Baker told Congress in 2024 that he was aware of only 10 transgender athletes out of more than half a million students on college teams.

Baker’s NCAA and the U.S. Olympic and Paralympic Committees banned transgender women from women’s sports after President Donald Trump, a Republican, signed an executive order aimed at barring their participation.

The public generally is supportive of the limits. An Associated Press-NORC Center for Public Affairs Research poll conducted in October 2025 found that about 6 in 10 U.S. adults “strongly” or “somewhat” favored requiring transgender children and teenagers to compete only on sports teams that match their biological sex and not the gender they identify with, while about 2 in 10 were “strongly” or “somewhat” opposed and about one-quarter did not have an opinion.

About 2.1 million adults, or 0.8%, and 724,000 people ages 13 to 17, or 3.3%, identify as transgender in the U.S., according to the Williams Institute at the UCLA School of Law.