Understanding Oregon’s Election System: What Voters Decide in May and November

Oregon — Oregon’s election system is shaped by two key voting dates each year, a closed primary structure for major parties, and a vote-by-mail process that applies to nearly every election. Together, those features determine not only when voters cast ballots, but often when races are effectively decided.

All Oregon elections are conducted by mail, but voters can turn their ballots in directly to their County Clerk or vote in person if they choose. Voters can contact their County Clerk’s Office for more information. Ballots are sent to registered voters roughly three weeks before Election Day and must be returned or dropped at an official ballot box by 8 p.m. on Election Day. The system is administered by county clerks under the oversight of the Oregon Secretary of State. Oregon has used vote-by-mail statewide for more than two decades.

Elections are divided primarily between May and November, with each serving a distinct purpose. The May election functions as the state’s primary and local election. During this election, voters registered with a political party choose their party’s nominees for offices such as governor, U.S. Senate, U.S. House, and the Oregon Legislature. Because Oregon operates a closed primary system, only voters registered with a party may participate in that party’s primary. Voters who are unaffiliated or registered with a different party generally cannot vote in Democratic or Republican primaries unless a party chooses to open its ballot, which is rare.

In addition to party primaries, the May ballot includes nonpartisan races for local offices such as mayor, city council, school boards, and special districts. It also commonly features local measures, including school bonds, levies, and city or county tax questions. In some nonpartisan contests, a candidate who receives more than 50 percent of the vote in May is elected outright and does not advance to the November ballot. Voters not registered with a party can still vote on nonpartisan races and on statewide ballot measures or local initiatives.

Voter turnout in May elections is typically modest compared to November. Historically, about 30 to 40 percent of registered voters participate. Turnout tends to skew older and more partisan, with lower participation among younger voters and those not affiliated with a major party. Because many legislative and local districts in Oregon lean heavily toward one party, the May primary can effectively determine the eventual officeholder, even though fewer voters participate.

The November general election is when final decisions are made. All voters, regardless of party registration, receive the same ballot. November ballots include general election contests for federal, state, and legislative offices, as well as statewide ballot measures. In presidential election years, the presidency appears on the ballot, while midterm elections focus on congressional, legislative, and statewide offices.

November elections consistently draw much higher participation. In presidential election years, turnout often reaches between 65 and 80 percent of registered voters. In midterm years, turnout generally falls between 55 and 65 percent, still among the highest rates in the country. The higher turnout means November elections more closely reflect the broader electorate, particularly among younger and unaffiliated voters.

The structure of Oregon’s election calendar has significant implications. Decisions made in low-turnout May elections often shape the choices voters see in November, and local funding measures are frequently decided months before the general election. Election officials and civic organizations routinely emphasize the importance of participating in both elections, noting that the outcomes of May primaries and local contests can be just as consequential as the high-profile races decided in November.

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