Montana's Governor Greg Gianforte has signed into law a controversial bill that legally defines sex as binary, based solely on an individual's reproductive system. The legislation, enacted nearly a year after its passage through the state Legislature, officially amends numerous sections of Montana law to include new definitions for "male," "female," "sex," and "gender."
This move comes after a similar 2023 law, Senate Bill 437, was twice ruled unconstitutional. The previous iteration was first struck down in June 2024 due to an unclear title, and again in February 2025 for violating the equal protections clause of the Montana Constitution.
