# Montana SB 428: Generally revise county speed limits Montana SB 428, Generally revise county speed limits, is a 69th Legislature, Regular Session (2025) Senate bill sponsored by Willis Curdy (Democrat); status signed, last action 2025-05-08 (Chapter Number Assigned) (as of 2026-10-12). - Canonical: https://policyrisk.com/state-bill/MT-SB428-2025 - As of: 2026-10-12 - Plain-text twin of the page above; the HTML and this file carry the same facts. ## Facts - Bill: Montana SB 428 - State: Montana - Session: 69th Legislature, Regular Session (2025) - Title: Generally revise county speed limits - Status: signed - Chamber: Senate - Introduced: 2025-02-24 - Last action: 2025-05-08, Chapter Number Assigned - Sponsor: Willis Curdy (Democrat) - Cosponsors: 1 - Subjects: Local Government, Motor Vehicles, Traffic Regulations - Touches household money: no - Roll calls: 4 (213 yes, 85 no in all) - Economic provisions PRIA read: 5 ## Summary No summary available. ## Bill overview: provisions PRIA read - State sets speeds on highways: benefit, medium. The Montana Highway Commission sets special speed limits on state highways and other commission‑designated highways, including in cities and towns. These limits follow state rules and apply statewide for consistency. - Misdemeanor penalties for speed violations: cost, medium. Breaking a posted altered speed limit is a misdemeanor. Standard altered limits are punished under the general traffic misdemeanor law. Altered limits in school zones use the school‑zone penalty law. - Local speed changes in urban areas: mixed, low. Local officials can lower or raise speeds in urban districts after a traffic study. Any nighttime increase cannot go above 65 miles per hour. They can also set safe speeds on arterial streets. A changed limit only applies when the new signs are posted. - New rules for county and rural roads: mixed, low. Outside urban areas, local officials can lower speeds after a study, but not below 25 miles per hour on paved or unpaved roads. On county roads, commissioners can set the outside‑urban and school‑zone limits without a traffic study. On unpaved roads, the same posted speed applies to all vehicle typ… - School zones: lower speeds and clear signs: mixed, low. Local governments can lower school‑zone speeds to as low as 15 miles per hour and set times of day after a traffic study. They must consult the school district. If a school zone includes a state highway, they must also consult the state DOT and the commission. When a school‑zone speed is lowered, s… ## Sponsors and cosponsors - Sponsor: Willis Curdy (Democrat), Senate - Cosponsor: Neil Duram (Republican), House ## Roll call votes | Date | Chamber | Motion | Result | Yes | No | Other | | --- | --- | --- | --- | --- | --- | --- | | 2025-04-11 | House | Do Concur | pass | 72 | 27 | | | 2025-04-10 | House | Do Concur | pass | 78 | 22 | | | 2025-03-06 | Senate | Do Pass | pass | 32 | 18 | | | 2025-03-06 | Senate | Do Pass | pass | 31 | 18 | | ## Actions (23) - 2025-05-08: Chapter Number Assigned (Senate) - 2025-05-05: Signed by Governor (Senate) - 2025-04-25: Transmitted to Governor (Senate) - 2025-04-25: Signed by Speaker (House) - 2025-04-21: Signed by President (Senate) - 2025-04-13: Returned from Enrolling (Senate) - 2025-04-11: Sent to Enrolling (Senate) - 2025-04-11: 3rd Reading (House) - 2025-04-10: 2nd Reading (House) - 2025-03-29: Committee Report (House) - 2025-03-28: Committee Executive Action (House) - 2025-03-17: 1st Reading (House) - 2025-03-17: Hearing (House) - 2025-03-17: Referred to Committee (House) - 2025-03-07: Transmitted to House (Senate) - 2025-03-06: 3rd Reading (Senate) - 2025-03-06: 2nd Reading (Senate) - 2025-03-01: Committee Report (Senate) - 2025-02-28: Committee Executive Action (Senate) - 2025-02-26: Hearing (Senate) - 2025-02-24: Referred to Committee (Senate) - 2025-02-24: 1st Reading (Senate) - 2025-02-24: Introduced (Senate) ## Bill text - Enrolled, 2025-04-12: [PDF](https://docs.legmt.gov/download-ticket?ticketId=db8dfb10-e3f5-401e-b944-a2db956d5110) - Introduced, 2025-02-24: [PDF](https://docs.legmt.gov/download-ticket?ticketId=52a5f080-9a3e-4fc4-ac30-b0adbf6f5b34) ## 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=db8dfb10-e3f5-401e-b944-a2db956d5110) - [Introduced (PDF)](https://docs.legmt.gov/download-ticket?ticketId=52a5f080-9a3e-4fc4-ac30-b0adbf6f5b34) ## 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-SB428-2025 (as of 2026-10-12).