- Democratic congressional and state primaries: open
- Republican congressional and state primaries: open
- Democratic Presidential primary: open
- Republican Presidential primary: open
- Texas has nonpartisan registration. There is no option to affiliate with a political party on the voter registration form.
Details of voting in congressional and state primary elections:
- Voters do not declare affiliation with a party in order to vote in the primary elections, but they must choose one party's ballot.
- Voters are only tied to party affiliation within the election cycle if there is a runoff.
- Texas voters are not held to past affiliations from election to election.