The 2018 Wisconsin Senate elections were held on Tuesday, November 6, 2018, at the Fall general election in Wisconsin. Seventeen of the 33 seats in the Wisconsin Senate were up for election—the odd-numbered districts. Before the election, Republicans held 18 seats and Democrats held 15 seats. Of the seats up for election, 10 were held by Republicans and 7 were held by Democrats. The primary election was held on August 14, 2018.

Quick Facts 17 of the 33 seats in the Wisconsin State Senate 17 seats needed for a majority, Majority party ...

2018 Wisconsin Senate election

← 2016 November 6, 2018 (2018-11-06) 2020 →
17 of the 33 seats in the Wisconsin State Senate 17 seats needed for a majority
Majority party Minority party   Leader Scott Fitzgerald Jennifer Shilling Party Republican Democratic Leader's seat 13th–Juneau 32nd–La Crosse Last election 9 seats, 48.6% 7 seats, 50.3% Seats before 18 15 Seats won 11 6 Seats after 19 14 Seat change 1 1 Popular vote 675,016 605,142 Percentage 52.3% 46.9% Seats up 10 7
Results of the elections:      Republican hold      Republican gain      Democratic hold      No election
President before election Roger Roth Republican Elected President Roger Roth Republican

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Republicans maintained control of the Senate, flipping one Democratic-held seat to enter the 104th Wisconsin Legislature with 19 of 33 Senate seats.^[1]

Statewide results of the 2018 Wisconsin State Senate election:^[2]

More information Seats, Party (majority caucus shading) ...

Seats		Party (majority caucus shading)		Total
		Democratic	Republican
Last election (2016)		7	9	16
Total after last election (2016)		13	20	33
Total before this election		15	18	33
Up for election		7	10	17
of which:	Incumbent retiring	1	0	1
	Vacated	0	0	0
	Unopposed	1	1	2
This election		6	11	17
Change from last election		1	1
Total after this election		14	19	33
Change in total		1	1

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More information Party, Candi-dates ...

Party		Candi- dates	Votes		Seats
			No.	%	No.	+/–	%
	Republican Party	15	675,016	52.31%	11	1	64.71%
	Democratic Party	15	605,142	46.90%	6	1	35.29%
	Independent	1	1,776	0.14%	0		0.00%
	Write-in	2	57	0.00%	0		0.00%
	Scattering		8,346	0.65%	0		0.00%
Total		33	1,290,337	100.00%	17		100.00%

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Two special elections were held during 2018 for vacancies in the state Senate. Democrats won both special elections, for a net gain of two seats.

Results of the 2018 Wisconsin State Senate election by district:^[2]

• 2018 Wisconsin elections
  • 2018 Wisconsin gubernatorial election
  • 2018 Wisconsin Attorney General election
  • 2018 Wisconsin State Assembly election
  • 2018 United States Senate election in Wisconsin
  • 2018 United States House of Representatives elections in Wisconsin
• 2018 United States elections
• Wisconsin Senate
• Elections in Wisconsin
• Redistricting in Wisconsin