Little v. Hecox
What's at Stake
Lindsay is a college student at Boise State University. She wants to run on the track team so she can form friendships with other girls. A new law in Idaho would ban her from doing so because she is transgender.
Summary
Update: On June 30, 2026, the Supreme Court upheld Idaho’s sports ban, holding that the law does not violate either Title IX or the Equal Protection Clause. Read more about the ruling here.
Among the dozens of anti-trans laws introduced in 2020 was Idaho’s HB 500, which bans women and girls who are transgender and many women and girls who are intersex from participating in sports. Governor Brad Little signed the law, making Idaho the first state to impose an outright ban on participation of transgender student athletes.
Idaho already had one of the most restrictive policies in the country regulating participation of transgender athletes in high school athletics. This restrictive policy, which was replaced by HB 500’s outright ban on participation, required girls who are transgender to complete one year of hormone therapy as part of gender transition before competing in girls’ sports. Under the Idaho law, girls and women who are transgender were categorically barred from participation under any circumstances, and at all levels of competition.
Lindsay is represented by the ACLU and the ACLU of Idaho, Legal Voice, and Cooley LLP.
As a result of an injunction issued by the lower courts at the beginning of the case, our client Lindsay has been able to try out for club sports at her college, and played on the club soccer team.
On June 30, 2025, the Supreme Court granted Idaho’s request to review the lower courts' decision.
Legal Documents
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12/10/2025
Reply Brief for Petitioners -
11/17/2025
Amicus Briefs in Support of Respondents -
- Amicus Brief of Information Society Project at Yale Law School in Support of Respondents
- Amicus Brief of Advocates for Girls' and Women's Rights in Support of Respondents
- Amicus Brief of Andraya Yearwood in Support of Respondents
- Amicus Brief of Coaches, Teammates, Competitors, and Allies of Transgender Athletes in Support of Respondents
- Amicus Brief of Constitutional Accountability Center in Support of Respondents
- Amicus Brief of Constitutional Law Scholars in Support of Respondents
- Amicus Brief of Equal Protection Scholars in Support of Respondents
- Amicus Brief of Federal Jurisdiction Scholars in Support of Respondents
- Amicus Brief of GLBTQ Legal Advocates & Defenders et al. in Support of Respondents
- Amicus Brief of Law and History Scholars in Support of Respondents
- Amicus Brief of Members of Congress in Support of Respondents
- Amicus Brief of National Women's Law Center in Support of Respondents
- Amicus Brief of New York et al. in Support of Respondents
- Amicus Brief of Practicing Pediatric Endocrinologists and Pediatricians in Support of Respondents
- Amicus Brief of Professional, Olympic, and International Atheletes in Women's Sports in Support of Respondents
- Amicus Brief of Professors of Constitutional Law in Support of Respondents
- Amicus Brief of Scholars of Equal Opportunity and Anti-Discrimination Law in Support of Respondents
- Amicus Brief of the American Psychological Association et. al in Support of Respondents
- Amicus Brief of the Transgender Law Center et al. in Support of Respondents
- Amicus Brief of Professor Joanna Harper et al. in Support of Respondents
Amicus Brief of Information Society Project at Yale Law School in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Advocates for Girls' and Women's Rights in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Andraya Yearwood in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Coaches, Teammates, Competitors, and Allies of Transgender Athletes in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Constitutional Accountability Center in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Constitutional Law Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Equal Protection Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Federal Jurisdiction Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of GLBTQ Legal Advocates & Defenders et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Law and History Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Members of Congress in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of National Women's Law Center in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of New York et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Practicing Pediatric Endocrinologists and Pediatricians in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Professional, Olympic, and International Atheletes in Women's Sports in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Professors of Constitutional Law in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Scholars of Equal Opportunity and Anti-Discrimination Law in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of the American Psychological Association et. al in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of the Transgender Law Center et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentAmicus Brief of Professor Joanna Harper et al. in Support of RespondentsDate Filed: 11/19/2025
Court: Supreme Court (U.S.)
Download Document -
11/10/2025
Brief for Respondent Lindsay Hecox -
09/12/2025
Brief for Petitioners -
09/02/2025
Respondent Lindsay Hecox's Suggestion of Mootness -
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09/26/2025
Petitioners' Response to Respondent Lindsay Hecox's Suggestion of Mootness -
09/30/2025
Respondent Lindsay Hecox's Reply in Support of Suggestion of Mootness -
10/16/2025
Petitioners' Supplemental Brief Regarding Respondent Lindsay Hecox's Suggestion of Mootness
Petitioners' Response to Respondent Lindsay Hecox's Suggestion of MootnessDate Filed: 09/26/2025
Court: Supreme Court (U.S.)
Download DocumentRespondent Lindsay Hecox's Reply in Support of Suggestion of MootnessDate Filed: 09/30/2025
Court: Supreme Court (U.S.)
Download DocumentPetitioners' Supplemental Brief Regarding Respondent Lindsay Hecox's Suggestion of MootnessDate Filed: 10/16/2025
Court: Supreme Court (U.S.)
Download Document -
09/26/2025
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06/23/2025
Supplemental Brief of Petitioners -
10/29/2024
Reply Brief for Petitioners -
10/15/2024
Respondents' Brief in Opposition -
07/11/2024
Petition for a Writ of Certiorari
Date Filed: 11/10/2025
Court: Supreme Court (U.S.)
Download DocumentDate Filed: 09/02/2025
Court: Supreme Court (U.S.)
Download DocumentDate Filed: 06/23/2025
Court: Supreme Court (U.S.)
Download DocumentDate Filed: 10/15/2024
Court: Supreme Court (U.S.)
Download DocumentDate Filed: 07/11/2024
Court: Supreme Court (U.S.)
Download Document-
06/14/2024
Amended Opinion -
06/10/2024
Order Denying Petitions for Rehearing En Banc -
06/07/2024
Amended Opinion -
09/28/2023
Plaintiffs-Appellees' Response to Defendants-Appellants' and Intervenors-Appellants' Petitions for Rehearing En Banc -
09/07/2023
Amicus Briefs in Support of Rehearing En Banc -
- Amicus Brief of America First Legal Foundation
Amicus Brief of America First Legal FoundationDate Filed: 09/07/2023
Court: Appeals Court (9th Cir.)
Download Document -
08/31/2023
Defendants-Appellants' Petition for Rehearing En Banc -
08/31/2023
Intervenors-Appellants' Petition for Rehearing En Banc -
08/17/2023
Opinion -
09/09/2022
Intervenors-Appellants' Supplemental Brief -
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09/23/2022
Plaintiffs-Appellees' Opposition to Intervenors-Appellants' Supplemental Brief
Plaintiffs-Appellees' Opposition to Intervenors-Appellants' Supplemental BriefDate Filed: 09/23/2022
Court: Appeals Court (9th Cir.)
Download Document -
09/23/2022
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06/24/2021
Order -
01/08/2021
Intervenors-Appellants' Reply Brief -
01/08/2021
Appellants' Reply Brief -
01/04/2021
Amicus Briefs in Support of Appellees -
- GLAD and NCLR Amicus Brief
- Teammates and Coaches Amicus Brief
- Businesses Amicus Brief
- National Women's Law Center Amicus Brief
- Collection of States Amicus Brief
- Medical and Mental Health Associations Amicus Brief
- interACT Amicus Brief
- Former Idaho Attorneys General Amicus Brief
- Transgender Athletes Amicus Brief
- Athletes in Women's Sports Amicus Brief
National Women's Law Center Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentCollection of States Amicus BriefDate Filed: 12/21/2021
Court: Appeals Court (9th Cir.)
Download DocumentMedical and Mental Health Associations Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentFormer Idaho Attorneys General Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentTransgender Athletes Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentAthletes in Women's Sports Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download Document -
12/14/2020
Plaintiffs-Appellees Brief -
11/19/2020
Amicus Briefs in Support of Appellants -
- Collection of States Amicus Brief
- Medical Professionals Amicus Brief
- Women's Liberation Front Amicus Brief
- Women's Human Rights Campaign Amicus Brief
Collection of States Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentMedical Professionals Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentWomen's Liberation Front Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentWomen's Human Rights Campaign Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download Document -
11/12/2020
Intervenors-Appellants' Opening Brief -
11/12/2020
Appellants' Opening Brief
Date Filed: 06/10/2024
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 09/28/2023
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 08/31/2023
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 08/31/2023
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 09/09/2022
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 01/08/2021
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 11/12/2020
Court: Appeals Court (9th Cir.)
Download Document-
07/18/2022
Order on Mootness Issue -
10/15/2021
Stipulated Facts in Response to Ninth Circuit Order -
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11/12/2022
Intervenors' Opening Brief in Response to Ninth Circuit Order -
11/12/2021
Defendants' Opening Brief in Response to Ninth Circuit Order -
11/12/2021
Plaintiffs' Opening Brief in Response to Ninth Circuit Order -
12/03/2021
Defendants' Response Brief Addressing Ninth Circuit Order -
12/03/2021
Hecox v. Little - Plaintiffs' Response Brief Regarding Mootness
Intervenors' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2022
Court: District Court (D. Idaho)
Download DocumentDefendants' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2021
Court: District Court (D. Idaho)
Download DocumentPlaintiffs' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2021
Court: District Court (D. Idaho)
Download DocumentDefendants' Response Brief Addressing Ninth Circuit OrderDate Filed: 12/03/2021
Court: District Court (D. Idaho)
Download DocumentHecox v. Little - Plaintiffs' Response Brief Regarding MootnessDate Filed: 12/03/2021
Court: District Court (D. Idaho)
Download Document -
11/12/2022
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08/17/2020
Decision Granting Preliminary Injunction -
06/19/2020
United States Statement of Interest -
06/05/2020
State of Idaho Motion To Dismiss -
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06/22/2020
Plaintiffs' Response in Opposition to Motion to Dismiss -
07/06/2020
State of Idaho Reply in Support of Motion to Dismiss
Plaintiffs' Response in Opposition to Motion to DismissDate Filed: 06/22/2020
Court: District Court (D. Idaho)
Download DocumentState of Idaho Reply in Support of Motion to DismissDate Filed: 07/06/2020
Court: District Court (D. Idaho)
Download Document -
06/22/2020
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06/05/2020
Alliance Defending Freedom Motion to Intervene -
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06/09/2020
Plaintiffs Opposition to Motion to Intervene -
06/05/2020
Alliance Defending Freedom Proposed Answer -
06/05/2020
Marshall Declaration -
06/05/2020
Kenyon Declaration -
06/16/2020
Alliance Defending Freedom Reply in Support of Motion to Intervene
Plaintiffs Opposition to Motion to InterveneDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentAlliance Defending Freedom Proposed AnswerDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentAlliance Defending Freedom Reply in Support of Motion to InterveneDate Filed: 06/16/2020
Court: District Court (D. Idaho)
Download Document -
06/09/2020
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04/30/2020
Motion for Preliminary Injunction -
- Memorandum in Support of Preliminary Injunction
- Adkins Declaration
- Carroll Declaration
- Swoboda Declaration
- Safer Declaration
- Fry Declaration
- Lindsay Hecox Declaration
- State of Idaho Response in Opposition to Preliminary Injunction
- Declaration of Gregory Brown
- Alliance Defending Freedom Proposed Memorandum in Opposition to Preliminary Injunction
- Chelsea Mitchell Declaration
- Stephen Levine Declaration
- Plaintiffs' Reply to Opposition to Preliminary Injunction
- Deanna Adkins Declaration
- Jack Turban Declaration
- Joshua Safer Declaration
Memorandum in Support of Preliminary InjunctionDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentState of Idaho Response in Opposition to Preliminary InjunctionDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentDeclaration of Gregory BrownDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentAlliance Defending Freedom Proposed Memorandum in Opposition to Preliminary InjunctionDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentChelsea Mitchell DeclarationDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentStephen Levine DeclarationDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentPlaintiffs' Reply to Opposition to Preliminary InjunctionDate Filed: 06/29/2020
Court: District Court (D. Idaho)
Download Document -
04/15/2020
Complaint
Date Filed: 10/15/2021
Court: District Court (D. Idaho)
Download DocumentDate Filed: 08/17/2020
Court: District Court (D. Idaho)
Download DocumentDate Filed: 06/19/2020
Court: District Court (D. Idaho)
Download DocumentDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentPress Releases
Appeals Court Blocks Idaho Ban on Transgender Youth Athletes
Women’s and Civil Rights Groups, Athletes, Coaches, Corporations, and Legal and Medical Experts Tell Federal Appeals Court to Strike Down Idaho Anti-Trans Law
Judge Blocks First Law Targeting Transgender Athletes as Case Continues
ACLU, Legal Voice File Lawsuit Challenging Idaho’s Law Targeting Transgender Student Athletes