New Montana laws taking effect May 1, 2025

37 laws take effect May 1, 2025.

Of the 778 bills enacted since 2025, 774 have an effective date and 4 don't yet (listed below). A law here takes effect that day by its main provisions; parts of a staggered act may take effect on other dates.

Updated Oct 31, 2026 at 11:39 a.m. EDT.

Elections (7)

  • HB 193 · 2025 Regular SessionPublished

    Require signature for voter registration cancellation

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 201 · 2025 Regular SessionPublished

    Require disclosure of paid signature gatherers for initiatives

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 293 · 2025 Regular SessionPublished

    Revise election administrator laws

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 380 · 2025 Regular SessionPublished

    Revise meeting date for presidential electors to align with federal law

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 413 · 2025 Regular SessionPublished

    Revise election laws regarding residency

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 423 · 2025 Regular SessionPublished

    Revise election laws related to active and inactive voter lists

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 455 · 2025 Regular SessionPublished

    Revise election laws related to COPP deadlines for municipal candidates

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Healthcare (6)

  • HB 342 · 2025 Regular SessionPublished

    Revise civil liability laws to provide a statutory duty of care for certain actions

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 388 · 2025 Regular SessionPublished

    Create pregnancy center autonomy and rights of expression act

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 454 · 2025 Regular SessionPublished

    Revise visit frequency required of supervisory physical therapists

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 458 · 2025 Regular SessionPublished

    Generally revise laws related to physician assistants

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 473 · 2025 Regular SessionPublished

    Allow for automatic CMS medicare fee schedule updates

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 474 · 2025 Regular SessionPublished

    Revise date for annual supplemental medicaid payment to hospitals

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Climate (5)

Government (5)

  • HB 126 · 2025 Regular SessionPublished

    Revise legislative oversight of administrative rules and encourage public comment

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 166 · 2025 Regular SessionPublished

    Revise Montana historical society laws

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 531 · 2025 Regular SessionPublished

    Revise laws related to legislative rules

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 603 · 2025 Regular SessionPublished

    Eliminate attorney requirements on quasi-judicial boards

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

  • HB 651 · 2025 Regular SessionPublished

    Allow for temporary door locks during emergency situations

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Civil Rights (2)

Crime (2)

Public Lands (2)

Traffic (2)

Agriculture (1)

Education (1)

  • HB 631 · 2025 Regular SessionPublished

    Revise student online protection laws related to postsecondary opportunities

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Finance (1)

  • HB 464 · 2025 Regular SessionPublished

    Revise insurance laws relating to interest of a named insured and change of interest by transfer on death

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Housing (1)

  • HB 629 · 2025 Regular SessionPublished

    Revise laws related to a proposed subdivision's connection to a public water supply or wastewater system

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Mining and Drilling (1)

Taxes (1)

  • HB 671 · 2025 Regular SessionPublished

    Revise ABLE Act definitions to conform to Montana individual income tax code

    How we got this date

    Published by the legislature: All Sections: 2025-05-01.

    How effective dates are worked out

Enacted, but not yet dated (4)

These laws' texts tie their dates to something outside the legislative record (Contingent), or not enough is recorded yet to give one (Unresolved). They may take effect May 1, 2025 too; the record doesn't say.

Show all 4
  • HB 447ContingentEnact the Respiratory Care Interstate CompactEffective on the date the compact is legislatively enacted into law by the seventh member state
  • HB 56ContingentEstablish ambulance provider assessment fee programApproval by the United States department of health and human services of all waivers and approvals necessary to implement the assessment fee and supplemental payments
  • SB 233ContingentAdopting the interstate massage compactCompact legislatively enacted into law by the seventh member state
  • SB 279ContingentAdopt the dietitian licensure compactThe compact has been legislatively enacted into law by the seventh member state.