2017 special election for Montana's at-large District
U.S. House · Montana
Greg Gianforte (R) won with 50.0% of the vote, defeating Rob Quist (D) by 5.6 points.
Source: Federal Election CommissionUpdated Oct 3, 2026, 3:20 AM ET
The seat over time
D − R margin in this seat's races around 2017
Races before and after
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Money in this race
Each line compares the two campaigns on one scale.
Other candidates' campaigns: Mark Wicks $6.8K.
Campaign money: FEC, through Sep 30, 2018.
Source: FEC campaign filingsUpdated Sep 30, 2018
Polls against the result
- Poll with Quist ahead
- Poll with Gianforte ahead
- Result
| Pollster | Dates | Sample | Quist | Gianforte | Margin | Adjusted | Miss vs result | Grade | Release |
|---|---|---|---|---|---|---|---|---|---|
| Change Research | May 22 | 1,888 | 44 | 49 | R+5 | — | +0.6 | B+ | Wikipedia |
| Gravis Marketing | May 22 | 818 | 35 | 49 | R+14 | — | −8.4 | B− | Wikipedia |
| Gravis Marketing | May 3 | 462 | 37 | 45 | R+8 | — | −2.4 | B− | Wikipedia |
| Garin-Hart-Yang Research GroupD-sponsored | Apr 26 | 601 | 43 | 49 | R+6 | — | −0.4 | B+ | Wikipedia |
| Emerson College | Apr 20 | 648 | 37 | 52 | R+15 | — | −9.4 | A+ | Wikipedia |
| Gravis Marketing | Apr 3 | 1,222 | 38 | 50 | R+12 | — | −6.4 | B− | Wikipedia |
Adjusted: after correcting for the pollster's house effect and likely-voter screens. Miss: the poll's margin minus the result; + means the poll leaned Democratic. Grade: the pollster's accuracy in past elections, A+ to D (pollster ratings).
Source: Each poll's release, via FiveThirtyEight poll listsUpdated May 22, 2017