Montana State Senate seat · lines in effect since 2024
Montana Senate District 13
A district of about 40,000 people, 29% of adults with a bachelor's degree. It votes R+42.8 relative to the nation for president.
2024 election
Nov 5, 2024- Josh Kassmier (R) · won100.0%
Unopposed.
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 12:13 PM ET
Where it sits among all 50 seats
Every Montana State Senate seat by partisan lean, from most Democratic to most Republican. Lean is the seat's presidential vote on current lines, relative to the nation.
Democratic
Source: 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET
Every election for this seat
17 races since 1970; the seat changed party 4 times. District numbers are redrawn after each census: each group is one set of lines.
| Year | Winner | Runner-up | Won by |
|---|---|---|---|
| Lines first used in 2024 | |||
| 2024 | Josh Kassmier (R) | — | Unopposed |
| Lines first used in 2022 | |||
| 2022 | Jeremy Trebas (R) | Casey Schreiner (D) | 3.3 |
| Lines first used in 2012 | |||
| 2018 | Brian Hoven (R) | Bob Moretti (D) | 9.3 |
| 2014 | Brian Hoven (R) | Carlie Boland (D) | 2.2 |
| Lines first used in 2002 | |||
| 2010 | Ed Buttrey (R)Flip | Kathleen M. Galvinhalcro (D) | 15.4 |
| 2006 | Joseph Tropila (D)Flip | — | Unopposed |
| 2002 | John Esp (R) | Paul A. Grigsby (D) | 13.4 |
| Lines first used in 1992 | |||
| 1998 | Lorents Grosfield (R) | — | Unopposed |
| 1994 | Lorents Grosfield (R) | — | Unopposed |
| 1992 | Gerry Devlin (R) | Betty Emilsson (D) | 31.2 |
| Lines first used in 1982 | |||
| 1988 | Gerry Devlin (R)Flip | Paul Ringling (D) | 14.7 |
| 1984 | Les J. Hirsch (D) | Donald Ochsner (R) | 8.3 |
| Lines first used in 1972 | |||
| 1980 | Jean A. Turnage (R) | — | Unopposed |
| 1976 | Jean A. Turnage (R) | Dave Scheeler (D) | 27.6 |
| 1974 | Jean A. Turnage (R)Flip | Leland Schoonover (D) | 5.8 |
| 1972 | John K. McDonald · John W. Devine · John Nelson Hall (D) | James F. Durkin (R) | 0.5 |
| Lines first used in 1962 | |||
| 1970 | William R. Mackay (R) | D. W. Columbus (D) | 40.0 |
Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)
Districts that overlap District 13
The state's districts in other chambers that share residents with this one, and the share of District 13's area in each.
- U.S. House
- MT-2 100%
Every race on these lines
Results recomputed from precinct returns as if today's boundaries had always existed, so years compare like for like.
| 2016 | 2018 | 2020 | 2024 | |
|---|---|---|---|---|
| President | R+37.3 | No race | R+37.0 | R+43.2 |
| U.S. Senate | No race | R+12.1 | R+31.0 | R+27.5 |
| Governor | R+7.4 | No race | No race | R+47.0 |
Outlined: the race for this seat itselfBlank: no race that year
Source: 99chambers results archive: precinct results allocated to current lines; 2026: civicAPIUpdated Nov 8, 2026, 7:01 PM ET
Who lives here, compared
Grey bars show the spread of all 50 seats. Small marks are other seats in Montana. The black marker is District 13.
Lower than 55% of seats.
Higher than 65% of seats.
Lower than 61% of seats.
Higher than 80% of seats.
Lower than 55% of seats.
Less dense than 69% of seats.
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current linesUpdated Oct 13, 2026, 5:06 AM ET
Seats most like this one
Nearest seats on demographics, density and lean.
District 727% college gradsR+40.2Not up in 2026District 9
26% college gradsR+48.8Held RDistrict 38
30% college gradsR+41.2Not up in 2026District 28
32% college gradsR+47.0Held R
Source: Census Bureau, American Community Survey 2020–2024 5-year estimates, allocated to current lines; 99chambers: 2024 and 2020 presidential results on current lines, relative to the nation (2024 weighted 3:1)Updated Oct 16, 2026, 5:19 AM ET