# Montana HB 586: Generally revise child safety restraint system laws Montana HB 586, Generally revise child safety restraint system laws, is a 69th Legislature, Regular Session (2025) House bill sponsored by Marc Lee (Democrat); status signed, last action 2025-05-19 (Chapter Number Assigned) (as of 2026-10-19). - Canonical: https://policyrisk.com/state-bill/MT-HB586-2025 - As of: 2026-10-19 - Plain-text twin of the page above; the HTML and this file carry the same facts. ## Facts - Bill: Montana HB 586 - State: Montana - Session: 69th Legislature, Regular Session (2025) - Title: Generally revise child safety restraint system laws - Status: signed - Chamber: House - Introduced: 2025-02-19 - Last action: 2025-05-19, Chapter Number Assigned - Sponsor: Marc Lee (Democrat) - Cosponsors: 0 - Subjects: Transportation, Minors, Traffic Regulations - Touches household money: no - Roll calls: 7 (390 yes, 156 no in all) - Economic provisions PRIA read: 3 ## Summary No summary available. ## Bill overview: provisions PRIA read - Updated child car seat rules by age: benefit, medium. The law sets clear car seat rules by age. Under age 2: a rear-facing seat. Ages 2 to under 4: a rear- or forward-facing seat with an internal harness. Ages 4 to under 8: a forward-facing harness seat or a booster with a lap-shoulder belt. Age 9 or older, or if a child outgrows the booster’s limits:… - Child-seat exemptions and one key removal: mixed, low. Some vehicles are exempt from the child-seat rule: motor homes, school buses, taxis, farm tractors, bicycles, mopeds, quadricycles, motorcycles, and motor-driven cycles. Any vehicle not required to have seat belts under 49 CFR 571 as of January 3, 2025 is also exempt. Ambulances and other emergency… - State drops child-seat approval rules: mixed, low. The transportation department no longer has to issue a state list of approved child restraints. Federal motor vehicle safety standards still control what seats are allowed. This is an administrative change and does not change fines or payments by itself. ## Sponsors and cosponsors - Sponsor: Marc Lee (Democrat), House ## Roll call votes | Date | Chamber | Motion | Result | Yes | No | Other | | --- | --- | --- | --- | --- | --- | --- | | 2025-04-17 | House | Do Concur | pass | 73 | 26 | | | 2025-04-16 | House | Do Concur | pass | 63 | 37 | | | 2025-04-03 | Senate | Do Concur | pass | 30 | 20 | | | 2025-04-02 | Senate | Do Concur | pass | 28 | 22 | | | 2025-03-20 | Senate | Rerefer to Transportation-Tempel | pass | 32 | 18 | | | 2025-03-07 | House | Do Pass | pass | 84 | 14 | | | 2025-03-05 | House | Do Pass | pass | 80 | 19 | | ## Actions (29) - 2025-05-19: Chapter Number Assigned (House) - 2025-05-13: Signed by Governor (House) - 2025-05-07: Transmitted to Governor (House) - 2025-05-06: Signed by President (Senate) - 2025-05-02: Signed by Speaker (House) - 2025-04-23: Returned from Enrolling (House) - 2025-04-18: Sent to Enrolling (House) - 2025-04-17: 3rd Reading Senate Amendments (House) - 2025-04-16: 2nd Reading Senate Amendments (House) - 2025-04-03: Returned to House with Amendments (Senate) - 2025-04-03: 3rd Reading (Senate) - 2025-04-02: 2nd Reading (Senate) - 2025-03-25: Committee Report (Senate) - 2025-03-24: Committee Executive Action (Senate) - 2025-03-20: Rereferred to Committee (Senate) - 2025-03-20: Committee Report (Senate) - 2025-03-19: Committee Executive Action (Senate) - 2025-03-17: Hearing (Senate) - 2025-03-14: Referred to Committee (Senate) - 2025-03-14: 1st Reading (Senate) - 2025-03-07: Transmitted to Senate (House) - 2025-03-07: 3rd Reading (House) - 2025-03-05: 2nd Reading (House) - 2025-03-01: Committee Report (House) - 2025-02-28: Committee Executive Action (House) - 2025-02-21: Hearing (House) - 2025-02-20: 1st Reading (House) - 2025-02-20: Referred to Committee (House) - 2025-02-19: Introduced (House) ## Bill text - Enrolled, 2025-04-22: [PDF](https://docs.legmt.gov/download-ticket?ticketId=698b5471-6958-4282-9d50-854e35c271b9) - As Amended (Version 3), 2025-03-25: [PDF](https://docs.legmt.gov/download-ticket?ticketId=ff268588-79c2-4d2f-9183-46f32e97f373) - As Amended (Version 2), 2025-03-01: [PDF](https://docs.legmt.gov/download-ticket?ticketId=1d75a1ca-9ce1-4614-9d68-5d67d31aa70d) - Introduced, 2025-02-19: [PDF](https://docs.legmt.gov/download-ticket?ticketId=001485cc-f32e-4701-ae10-5951305e2df7) ## Related bills - SB 437: Revise definition of sex in Montana law (signed) - HB 831: Increase elderly homeowner and renter income tax credit (vetoed) - HB 628: Revise early literacy targeted intervention laws (vetoed) - SB 410: Provide for Montana genomic security act (vetoed) - SB 424: Revising the disabled veteran property tax assistance program (vetoed) - SB 422: Generally revise laws relating to insurance coverage relating to cancer (vetoed) ## Sources - [Enrolled (PDF)](https://docs.legmt.gov/download-ticket?ticketId=698b5471-6958-4282-9d50-854e35c271b9) - [As Amended (Version 3) (PDF)](https://docs.legmt.gov/download-ticket?ticketId=ff268588-79c2-4d2f-9183-46f32e97f373) - [As Amended (Version 2) (PDF)](https://docs.legmt.gov/download-ticket?ticketId=1d75a1ca-9ce1-4614-9d68-5d67d31aa70d) - [Introduced (PDF)](https://docs.legmt.gov/download-ticket?ticketId=001485cc-f32e-4701-ae10-5951305e2df7) ## Related - [SB 437: Revise definition of sex in Montana law](https://policyrisk.com/state-bill/MT-SB437-2025) - [HB 831: Increase elderly homeowner and renter income tax credit](https://policyrisk.com/state-bill/MT-HB831-2025) - [HB 628: Revise early literacy targeted intervention laws](https://policyrisk.com/state-bill/MT-HB628-2025) - [SB 410: Provide for Montana genomic security act](https://policyrisk.com/state-bill/MT-SB410-2025) - [SB 424: Revising the disabled veteran property tax assistance program](https://policyrisk.com/state-bill/MT-SB424-2025) - [SB 422: Generally revise laws relating to insurance coverage relating to cancer](https://policyrisk.com/state-bill/MT-SB422-2025) - [Montana bills](https://policyrisk.com/states/montana/bills) - [Montana state hub](https://policyrisk.com/states/montana) - [All state legislation](https://policyrisk.com/state-bills) Source: PRIA, https://policyrisk.com/state-bill/MT-HB586-2025 (as of 2026-10-19).