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
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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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
Little v. HecoxLegal DocumentsAmicus Brief of Information Society Project at Yale Law School in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Advocates for Girls' and Women's Rights in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Andraya Yearwood in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Coaches, Teammates, Competitors, and Allies of Transgender Athletes in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Constitutional Accountability Center in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Constitutional Law Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Equal Protection Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Federal Jurisdiction Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of GLBTQ Legal Advocates & Defenders et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Law and History Scholars in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Members of Congress in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of National Women's Law Center in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of New York et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Practicing Pediatric Endocrinologists and Pediatricians in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus 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 DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Professors of Constitutional Law in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of Scholars of Equal Opportunity and Anti-Discrimination Law in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of the American Psychological Association et. al in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus Brief of the Transgender Law Center et al. in Support of RespondentsDate Filed: 11/17/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsAmicus 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
Little v. HecoxLegal DocumentsPetitioners' Response to Respondent Lindsay Hecox's Suggestion of MootnessDate Filed: 09/26/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsRespondent Lindsay Hecox's Reply in Support of Suggestion of MootnessDate Filed: 09/30/2025
Court: Supreme Court (U.S.)
Download DocumentLittle v. HecoxLegal DocumentsPetitioners' 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: 09/12/2025
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: 10/29/2024
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
Little v. HecoxLegal DocumentsAmicus 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
Little v. HecoxLegal DocumentsPlaintiffs-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
Little v. HecoxLegal DocumentsGLAD and NCLR Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsTeammates and Coaches Amicus BriefCourt: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsBusinesses Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsNational Women's Law Center Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsCollection of States Amicus BriefDate Filed: 12/21/2021
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsMedical and Mental Health Associations Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsinterACT Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsFormer Idaho Attorneys General Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsTransgender Athletes Amicus BriefDate Filed: 12/21/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsAthletes 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
Little v. HecoxLegal DocumentsCollection of States Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsMedical Professionals Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsWomen's Liberation Front Amicus BriefDate Filed: 11/19/2020
Court: Appeals Court (9th Cir.)
Download DocumentLittle v. HecoxLegal DocumentsWomen'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: 06/14/2024
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 06/10/2024
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 06/07/2024
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: 08/17/2023
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 09/09/2022
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 06/24/2021
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 01/08/2021
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 01/08/2021
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 12/14/2020
Court: Appeals Court (9th Cir.)
Download DocumentDate Filed: 11/12/2020
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
Little v. HecoxLegal DocumentsIntervenors' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2022
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsDefendants' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2021
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsPlaintiffs' Opening Brief in Response to Ninth Circuit OrderDate Filed: 11/12/2021
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsDefendants' Response Brief Addressing Ninth Circuit OrderDate Filed: 12/03/2021
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsHecox 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
Little v. HecoxLegal DocumentsPlaintiffs' Response in Opposition to Motion to DismissDate Filed: 06/22/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsState 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
Little v. HecoxLegal DocumentsPlaintiffs Opposition to Motion to InterveneDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsAlliance Defending Freedom Proposed AnswerDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsMarshall DeclarationDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsKenyon DeclarationDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsAlliance 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
Little v. HecoxLegal DocumentsMemorandum in Support of Preliminary InjunctionDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsAdkins DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsCarroll DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsSwoboda DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsSafer DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsFry DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsLindsay Hecox DeclarationDate Filed: 04/30/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsState of Idaho Response in Opposition to Preliminary InjunctionDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsDeclaration of Gregory BrownDate Filed: 06/05/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsAlliance Defending Freedom Proposed Memorandum in Opposition to Preliminary InjunctionDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsChelsea Mitchell DeclarationDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsStephen Levine DeclarationDate Filed: 06/09/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsPlaintiffs' Reply to Opposition to Preliminary InjunctionDate Filed: 06/29/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsDeanna Adkins DeclarationDate Filed: 06/29/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsJack Turban DeclarationDate Filed: 06/29/2020
Court: District Court (D. Idaho)
Download DocumentLittle v. HecoxLegal DocumentsJoshua Safer DeclarationDate Filed: 06/29/2020
Court: District Court (D. Idaho)
Download Document -
04/15/2020
Complaint
Date Filed: 07/18/2022
Court: District Court (D. Idaho)
Download DocumentDate 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 DocumentDate Filed: 04/15/2020
Court: District Court (D. Idaho)
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