The 2018 Wyoming gubernatorial election took place on November 6, 2018, to elect the governor of Wyoming. Incumbent Republican governor Matt Mead was term-limited and could not seek a third consecutive term. Republican nominee Mark Gordon defeated Democratic nominee Mary Throne by nearly 40 percentage points.
This was the only time since 1978 that a candidate from the President's party was elected governor of Wyoming.
Republican primary
Candidates
Nominated
Mark Gordon, Wyoming State Treasurer
Declared
Bill Dahlin, businessman
Foster Friess, businessman and activist
Sam Galeotos, businessman
Harriet Hageman, attorney and former Liz Cheney campaign advisor
Taylor Haynes, physician, write-in candidate for governor in 2010 and candidate for governor in 2014
Withdrew
Rex Rammell, veterinarian and perennial candidate (running for Constitution Party nomination)
Endorsements
Polling
Results
Democratic primary
Candidates
Nominated
Mary Throne, former Minority Leader of the Wyoming House of Representatives
Declared
Ken Casner, candidate for governor in 2002
Michael Allen Green, nominee for the U.S. House of Representatives in 2000
Rex Wilde, candidate for governor in 2010
Declined
James W. Byrd, state representative (running for secretary of state)
Ryan Greene, nominee for the U.S. House of Representatives in 2016 (running for Mayor of Rock Springs)
Chris Rothfuss, Minority Leader of the Wyoming Senate and nominee for U.S. Senate in 2008
Milward Simpson, director of the Wyoming Nature Conservancy
Gary Trauner, businessman and nominee for U.S. House of Representatives in 2006 and 2008 (running for U.S. Senate)
Endorsements
Results
Independents and third parties
Candidates
Declared
Rex Rammell, veterinarian and perennial candidate (Constitution)
General election
Debates
Complete video of debate, October 6, 2018
Complete video of debate, October 18, 2018
Predictions
Polling
Results
Counties that flipped from Republican to Democratic