Arizona voters will decide in November whether to impose wider restrictions on transgender participation in school sport and access to athletic changing facilities under Proposition 318, the Protect Girls’ Sports in Arizona Act.
The measure, placed on the ballot by the state legislature as HCR 2003, would amend Arizona’s existing student athletics law. Election Day is November 3, 2026, and the proposed changes would take effect on January 1, 2027, if approved. ([azsos.gov](https://azsos.gov/elections/ballot-measures))
What Proposition 318 would change
Under the proposal, every interscholastic and intramural team or sport run by a public or private school, higher education institution or athletic association would have to be designated as male, female or co-educational, based on the biological sex recorded on an athlete’s original birth certificate.
Males would be barred from competing in female teams and sports, while athletes could continue to participate in teams aligned with their recorded sex or in co-educational and mixed competitions. The ballot wording says the existing law applies to public schools and private schools whose pupils or teams compete against public schools; Proposition 318 would extend the requirement to all schools and athletic associations covered by the measure. ([azsos.gov](https://azsos.gov/sites/default/files/docs/2026-Ballot-Language-FINAL_0.pdf))
The proposal would also regulate private spaces connected with athletics, including restrooms, locker rooms and shower rooms. Schools and athletic associations would be prohibited from authorising a person to use a facility not designated for that individual’s biological sex as recorded at birth. ([azsos.gov](https://azsos.gov/sites/default/files/docs/2026-Ballot-Language-FINAL_0.pdf))
It would broaden the definition of an athlete to include anyone taking part in an interscholastic or intramural team or sport, rather than referring only to students. The measure would also expand the circumstances in which athletes could bring legal action over alleged breaches, including claims involving lost sporting opportunities, harm or retaliation after reporting a suspected violation. ([apps.azsos.gov](https://apps.azsos.gov/election/BallotMeasures/2026/2026-AZ-Publicity-Pamphlet.pdf))
A no vote would leave Arizona’s current student athletics laws in place, according to the official ballot language. ([azsos.gov](https://azsos.gov/sites/default/files/docs/2026-Ballot-Language-FINAL_0.pdf))
Arguments for and against Proposition 318
Supporters say the measure would protect fairness, safety and privacy for female athletes. Tucson attorney Thomas J. Bouman argued in the state’s voter pamphlet that participation based on biological sex would restore “clarity, fairness, and safety” to school athletics.
Supporters including Scottsdale campaigner George Khalaf say male physiology can create advantages in strength, speed and physical contact, potentially affecting girls’ access to team places, medals and scholarships. Khalaf did not cite specific cases in his published argument.
Opponents describe Proposition 318 as a blanket ban that would discriminate against transgender girls and could expose a much wider group of pupils to scrutiny over their appearance and identity. Phoenix resident Gaelle Esposito argued that sporting rules should allow individual assessments rather than impose a universal prohibition.
Arguments submitted against the measure also raise concerns about the effect of its provisions on changing rooms and bathrooms. Gayle Shanks and Bob Sommer said it could encourage harassment and intimidation of girls and gender-nonconforming pupils, while warning that invasive forms of “verification” could be used to target children.
The League of Women Voters of Arizona said the proposal would place detailed rules on sport and school facilities into state law while creating new opportunities for lawsuits against schools, athletic associations and educators. The ACLU of Arizona has likewise urged voters to reject the measure, saying it could lead to “gender checks” and force schools to police pupils’ bodies. ([apps.azsos.gov](https://apps.azsos.gov/election/BallotMeasures/2026/2026-AZ-Publicity-Pamphlet.pdf))
Proposition 318 is one of several statewide measures on Arizona’s 2026 general election ballot. Its official analysis was prepared by the Arizona Legislative Council and published in the Secretary of State’s voter publicity pamphlet. ([azleg.gov](https://www.azleg.gov/ballot-measures-2026-analyses/))
