Oklahoma is a modified closed primary state. In order to participate in a party’s primary or runoff primary, you must be a registered voter of that party; however, there is an exception. In every odd-numbered year between November 1 and November 30, state law allows all recognized political parties in Oklahoma the opportunity to open their primaries and runoff primaries to Independents during the next two election years by notifying the Secretary of the State Election Board. If a party chooses to open its primaries, the deadline is extended to December 15 for the other recognized parties to respond or change their response. If no notice is provided, a party’s primary remains closed under state law.
Voters who would like to change their party affiliation should do so before April 1, 2026. State law prohibits party affiliation changes April 1 through August 31 of even-numbered years. Party affiliation changes submitted during the closed period will be processed on September 1, 2026.
More information about political parties is available on the State Election Board website.
URL Guide: Political parties: https://oklahoma.gov/elections/voter-registration/political-party-info.html
