Nonpartisan · Data from OpenStates / Plural Policy · Montana
ZW
Republican
· Representative
Zack Wirth
Represents District 17 in the House of Representatives.
Votes with Republicans
95%
on 997 party-line votes · House Republicans median 91%
Cast a vote
99%
Yea or Nay on 3,039 of 3,047 roll calls · House median 99%
Their bills that became law
3 of 9
as a primary sponsor, this session · Republicans median 6
Roll calls on record
3,047
2025 Regular Session
Votes and bills updated Oct 5, 2026 from LegiScan (CC BY 4.0), which republishes the legislature’s own records. Profile details from OpenStates / Plural Policy. Figures cover 2025 Regular Session.
How Zack Wirth votes
A party-line vote is a roll call where most voting Democrats and most voting Republicans took opposite sides. Absences and not-voting are never counted. Same method as our Congress pages.
Where Zack Wirth sits in the House
Each dot is one member of the House, placed by how often they voted on the Democratic side of party-line votes. Zack Wirth is circled.
Always on the Republican sideAlways on the Democratic side
Times they broke with their party
51 of 997 party-line votes, most recent 10 shown.
SB324 · Revise vehicle registration fees and allocate revenue for bridges and victims of crime
(H) 3rd Reading Conference Committee Report Adopted · 2025-04-30 · Passed 57–43 · most Republicans voted the other way
HB2 · General Appropriations Act
(H) 3rd Reading Passed as Amended by Senate · 2025-04-30 · Passed 66–34 · most Republicans voted the other way
HB231 · Revise property tax rates for certain property
(H) 3rd Reading Conference Committee Report Adopted · 2025-04-30 · Passed 60–39 · most Republicans voted the other way
HB2 · General Appropriations Act
(H) 2nd Reading Senate Amendments Concurred · 2025-04-28 · Passed 67–33 · most Republicans voted the other way
SJ5 · Resolution for support of federal SAFER banking act
(H) 3rd Reading Concurred · 2025-04-25 · Passed 65–35 · most Republicans voted the other way
SB324 · Revise vehicle registration fees and allocate revenue for bridges and victims of crime
(H) 3rd Reading Concurred · 2025-04-24 · Passed 51–49 · most Republicans voted the other way
SB287 · Generally revise state finance laws
(H) 2nd Reading Motion to Amend Failed · 2025-04-24 · Failed 35–65 · most Republicans voted the other way
SB324 · Revise vehicle registration fees and allocate revenue for bridges and victims of crime
(H) 3rd Reading Concurred · 2025-04-24 · Passed 51–49 · most Republicans voted the other way
SB553 · Generally revise state policy laws
(H) 2nd Reading Concurred as Amended · 2025-04-23 · Passed 65–35 · most Republicans voted the other way
HJ54 · Interim study on waste-to-energy
(H) 3rd Reading Passed · 2025-04-23 · Passed 56–43 · most Republicans voted the other way
Closest votes they cast
Roll calls decided by the fewest votes, one per bill.
SB535 · Revise laws related to experimental treatments
(H) 3rd Reading Failed · 2025-04-25 · Failed 50–50
HJ67 · Study resolution on impacts of federal funding changes on OPI and OCHE
(H) 2nd Reading Not Passed · 2025-04-25 · Failed 50–50
SB287 · Generally revise state finance laws
(H) 2nd Reading Not Concurred · 2025-04-24 · Failed 50–50
SB326 · Generally revise laws related to MEDIA Act film tax credits
(H) Reconsidered Previous Action; Placed on 2nd Reading · 2025-04-18 · Failed 49–49
SB312 · Generally revise laws for crime victims
(H) 2nd Reading Not Concurred · 2025-04-14 · Failed 50–50
Democrats they vote with most
Share of contested roll calls (the losing side got at least 10%) where both voted and landed on the same side. Unanimous votes are left out, because on those everyone agrees.
Ed ByrneDemocrat · District 11 · 1,524 shared contested votes
81%
Lyn BennettDemocrat · District 4 · 1,498 shared contested votes
81%
Eric AlbusDemocrat · District 28 · 1,423 shared contested votes
35%
Their session, month by month
Dark bars are roll calls they were recorded on each month; the red part is the ones without a Yea or Nay (8 in all). Gaps are months the chamber wasn’t voting.
← Montana Delegation
YeaNayYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaYeaNayYeaNayYeaYeaNayYeaYeaYeaYeaNayNayNayYeaYeaYeaYeaYeaYeaNayYeaNayYeaYeaYeaYeaNayYeaYeaYeaYeaYeaYeaNayYeaYeaYeaYeaYeaYeaYea
Their bills, from filing to law
Bills Zack Wirth was a primary sponsor of this session. Most bills from either party never leave committee; in Illinois many never get past the Assignments or Rules committee.
Introduced9
Out of committee4
Passed one chamber4
Passed both chambers3
Became law3
Never left committee0
For comparison, the median Republican member of the House has 6 bills that became law this session.
What their bills are about
Legislature 3Motor Vehicles 2Transportation 2Highways and Roads 2General Joint Resolution 2Schools and Education 2
Resolution in support of instruction in reading and writing in cursive
Failed(S) Died in Standing Committee · 2025-05-22
Require ballot issue signers to be active registered voters
Failed(H) Died in Process · 2025-05-20
Revise laws to promote the teaching of cursive writing in schools
Failed(H) Died in Process · 2025-05-20
Revise civil liability laws relating to equine activities and waivers
Became lawChapter Number Assigned · 2025-05-19
Interim study of endocrine-disrupting chemicals and water quality
Became law(H) Filed with Secretary of State · 2025-05-06
Descriptions are the legislature’s own synopsis. Bill data from LegiScan, CC BY 4.0.
Loading committees…
SJ35 · 2025-04-30
Interim study of voter list maintenance and integrity ((H) 2nd Reading Concurred)
SB324 · 2025-04-30
Revise vehicle registration fees and allocate revenue for bridges and victims of crime ((H) 2nd Reading Conference Committee Report Adopted)
HB381 · 2025-04-30
Provide for educational credit for students volunteering in long term care, nursing home, home care, and child care settings ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ37 · 2025-04-30
Interim survey of behavioral health services in Montana ((H) 3rd Reading Concurred)
SJ36 · 2025-04-30
Study dependent neglect standards for prosecutors ((H) 3rd Reading Concurred)
HB850 · 2025-04-30
Provide licensing and regulation of community health workers ((H) 3rd Reading Passed as Amended by Senate)
HB818 · 2025-04-30
Ban foreign funding for ballot measures ((H) 3rd Reading Conference Committee Report Adopted)
SB446 · 2025-04-30
Revise laws related to healthcare utilization review ((H) 3rd Reading Free Conference Committee Report Adopted)
HB936 · 2025-04-30
Authorize transfers and other necessary measures to implement HB 2-Section B ((H) 3rd Reading Passed as Amended by Senate)
HB231 · 2025-04-30
Revise property tax rates for certain property ((H) 2nd Reading Conference Committee Report Adopted)
HB231 · 2025-04-30
Revise property tax rates for certain property ((H) 3rd Reading Conference Committee Report Adopted)
SB40 · 2025-04-30
Revise supreme court public records laws by opening deliberations and files to the public ((H) 3rd Reading Free Conference Committee Report Adopted)
SB524 · 2025-04-30
Revise laws relating to category D assisted living facilities ((H) 3rd Reading Conference Committee Report Adopted)
HB853 · 2025-04-30
Revise fees for licensed establishments ((H) 3rd Reading Passed as Amended by Senate)
HB2 · 2025-04-30
General Appropriations Act ((H) 3rd Reading Passed as Amended by Senate)
HB932 · 2025-04-30
Generally revise conservation financing laws ((H) 3rd Reading Passed as Amended by Senate)
SJ48 · 2025-04-30
Interim study of the public health and safety impacts of marijuana legalization ((H) 2nd Reading Concurred)
SJ48 · 2025-04-30
Interim study of the public health and safety impacts of marijuana legalization ((H) 3rd Reading Concurred)
HB513 · 2025-04-30
Revise laws related to use of name, voice, and likeness of individuals and penalties for unauthorized use ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ46 · 2025-04-30
Interim study of food security and agricultural prosperity ((H) 2nd Reading Not Concurred)
HB505 · 2025-04-30
Allow Montana housing infrastructure revolving loan fund to retain its interest and income and provide for fund transfers ((H) 3rd Reading Passed as Amended by Senate)
SJ49 · 2025-04-30
Interim study of youth and family behavioral health prevention ((H) 2nd Reading Concurred)
SJ49 · 2025-04-30
Interim study of youth and family behavioral health prevention ((H) 3rd Reading Concurred)
HB913 · 2025-04-30
Authorize transfers and other necessary measures to implement HB2 Section D ((H) 3rd Reading Passed as Amended by Senate)
SB319 · 2025-04-30
Generally revise health care laws related to doulas ((H) 3rd Reading Conference Committee Report Adopted)
SB324 · 2025-04-30
Revise vehicle registration fees and allocate revenue for bridges and victims of crime ((H) 3rd Reading Conference Committee Report Adopted)
HB682 · 2025-04-30
Generally revise laws regarding gender transition treatment ((H) 3rd Reading Free Conference Committee Report Adopted)
HB329 · 2025-04-30
Make the Montana ammunition act permanent ((H) 3rd Reading Conference Committee Report Adopted)
SB472 · 2025-04-30
Revise penalties for violations under 310 permit process ((H) 3rd Reading Free Conference Committee Report Adopted)
HB863 · 2025-04-30
Generally revise state finance laws ((H) 2nd Reading Senate Amendments Concurred)
HB863 · 2025-04-30
Generally revise state finance laws ((H) 3rd Reading Passed as Amended by Senate)
SJ42 · 2025-04-30
Interim study of noxious weed control ((H) 2nd Reading Concurred)
SJ42 · 2025-04-30
Interim study of noxious weed control ((H) 3rd Reading Concurred)
HB935 · 2025-04-30
Limits to Fox Hills-Hell Creek aquifer withdrawals ((H) 3rd Reading Passed as Amended by Senate)
HJ34 · 2025-04-30
Resolution supporting Montana's beef producers ((H) 3rd Reading Passed as Amended by Senate)
HB117 · 2025-04-30
Establish criminal justice data warehouse priorities ((H) 3rd Reading Free Conference Committee Report Adopted)
SJ35 · 2025-04-30
Interim study of voter list maintenance and integrity ((H) 3rd Reading Concurred)
HB936 · 2025-04-29
Authorize transfers and other necessary measures to implement HB 2-Section B ((H) 2nd Reading Senate Amendments Concurred)
HB511 · 2025-04-29
Provide grant funding for firefighting training facilities ((H) 3rd Reading Passed as Amended by Senate)
HB935 · 2025-04-29
Limits to Fox Hills-Hell Creek aquifer withdrawals ((H) 2nd Reading Senate Amendments Concurred)
HJ72 · 2025-04-29
Interim study of personal data sharing by DOT ((H) 3rd Reading Passed)
HB12 · 2025-04-29
Montana historic preservation grants ((H) 3rd Reading Passed as Amended by Senate)
HB932 · 2025-04-29
Generally revise conservation financing laws ((H) 2nd Reading Senate Amendments Concurred)
SJ35 · 2025-04-29
Interim study of voter list maintenance and integrity ((H) State Administration–Be Concurred In)
HB5 · 2025-04-29
Long-range building appropriations ((H) 3rd Reading Passed as Amended by Senate)
HB4 · 2025-04-29
Appropriations by budget amendment ((H) 3rd Reading Passed as Amended by Senate)
HB505 · 2025-04-29
Allow Montana housing infrastructure revolving loan fund to retain its interest and income and provide for fund transfers ((H) 2nd Reading Senate Amendments Concurred)
HB513 · 2025-04-29
Revise laws related to use of name, voice, and likeness of individuals and penalties for unauthorized use ((H) 2nd Reading Governor's Proposed Amendments Adopted)
HB913 · 2025-04-29
Authorize transfers and other necessary measures to implement HB2 Section D ((H) 2nd Reading Senate Amendments Concurred)
SB319 · 2025-04-29
Generally revise health care laws related to doulas ((H) 2nd Reading Conference Committee Report Adopted)
HB682 · 2025-04-29
Generally revise laws regarding gender transition treatment ((H) 2nd Reading Free Conference Committee Report Adopted)
SB218 · 2025-04-29
Provide for private right of action for injuries caused by certain medical interventions to treat gender dysphoria ((H) Reconsidered Previous Action; Placed on 2nd Reading)
HB924 · 2025-04-29
Generally revise state finance laws ((H) 3rd Reading Passed as Amended by Senate)
HB381 · 2025-04-29
Provide for educational credit for students volunteering in long term care, nursing home, home care, and child care settings ((H) 2nd Reading Governor's Proposed Amendments Adopted)
HB446 · 2025-04-29
Revise indecent exposure laws ((H) 3rd Reading Governor's Proposed Amendments Adopted)
SJ37 · 2025-04-29
Interim survey of behavioral health services in Montana ((H) 2nd Reading Concurred)
SJ34 · 2025-04-29
Interim study of child care ((H) 2nd Reading Not Concurred)
SJ33 · 2025-04-29
Interim study of the prescription drug supply chain ((H) 3rd Reading Concurred)
HB850 · 2025-04-29
Provide licensing and regulation of community health workers ((H) 2nd Reading Senate Amendments Concurred)
SJ36 · 2025-04-29
Study dependent neglect standards for prosecutors ((H) 2nd Reading Concurred)
Complete voting record from LegiScan (showing the 60 most recent of 3047 total roll-call votes this session).
Follow Zack Wirth
One email a week, only when there’s something: every time they broke with their party, and the closest votes they cast. Free, and you can stop any time.