SB437

Revise definition of sex in Montana law

Final Passage·4/11/25

Montana SB437 revises definitions of sex, female, and male in state law to refer to biological sex.

Montana SB437 amends the Montana Code Annotated to revise definitions of sex, female, and male to refer to biological sex and not gender identity or sexual intercourse. It specifies that sex refers to the biological and genetic indication of male or female, including sex chromosomes, gonads, and nonambiguous internal and external genitalia present at birth. The definitions apply to various statutes and compacts, affecting areas such as education, marriage, and criminal offenses. The bill also repeals section 1-1-201 of the Montana Code Annotated.

Included in complete analysis

  • Overview
  • Core Provisions
  • Implementation
  • Impact
  • Legal Framework
  • Critical Issues

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Where it stands

Last
Passed both chambers · 56–44 · Apr 11, 2025
Current
Awaiting the Governor
Next
Session adjourned — paused until it reconvenes

Sponsors

0
1
R
Democratic CaucusRepublican Caucus

Roll Call Votes

55 Yea

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44 Nay

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1 Absent

R

Calendar

Mar 26, 2025

8:00 AM

House Judiciary Hearing

Mar 4, 2025

7:00 AM

Senate Judiciary Hearing

History

Apr 21, 2025

Senate

(S) Signed by President

Apr 13, 2025

Senate

(S) Returned from Enrolling

Apr 11, 2025

House

(H) Scheduled for 2nd Reading