1 bill passed
Montana Senate Bill 473 passed the Senate in March 2025. Still, it died in the House, prohibiting large-scale geoengineering practices such as stratospheric aerosol injection and solar radiation management, while explicitly protecting cloud seeding for agriculture and water management.
Survived Senate drama; died on House floor
Montana Senate Bill 29 passed the Senate in 2021 but died in the House revising weather modification laws to streamline the licensing process mandate 100000 dollar liability insurance require environmental review and facilitate increased use of cloud seeding technology.
Passed Senate; rejected by House floor.
Montana House Joint Resolution 40 passed in 2019 directing a legislative study of weather modification laws to propose changes that would encourage increased use of cloud seeding technology for enhancing precipitation and water supplies.
Resolution filed with Secretary of State May 1 2019