United States gubernatorial elections will be held on November 6, 2018 in 36 states and three territories. In addition, special elections may take place if other gubernatorial seats are vacated. These elections form part of the 2018 United States elections. The last regular gubernatorial elections for all but three of the states took place in 2014. Governors in New Hampshire and Vermont serve two year terms, meaning that their most recent gubernatorial elections took place in 2016. Oregon, meanwhile, held a special election in 2016 to fill the unexpired term of John Kitzhaber following his resignation in February 2015; that election was won by the Democratic incumbent Kate Brown, who will serve the final 2 years of the term.
Many of the states holding gubernatorial elections have term limits which make some multi-term governors ineligible for re-election. Two Democratic governors are term-limited, while six incumbent Democratic governors are eligible for re-election. Among Republican governors, 14 are term-limited, while ten can seek re-election. One independent governor, Bill Walker of Alaska, is eligible for re-election.
Several sites and individuals publish predictions of competitive seats. These predictions look at factors such as the strength of the incumbent (if the incumbent is running for re-election), the strength of the candidates, and the partisan leanings of the state (reflected in part by the state's Cook Partisan Voting Index rating). The predictions assign ratings to each seat, with the rating indicating the predicted advantage that a party has in winning that seat. Most election predictors use "tossup" to indicate that neither party has an advantage, "lean" to indicate that one party has a slight advantage, "likely" or "favored" to indicate that one party has a significant but not insurmountable advantage, and "safe" or "solid" to indicate that one party has a near-certain chance of victory. Some predictions also include a "tilt" rating that indicates that one party has an advantage that is not quite as strong as the "lean" rating would indicate.