Who's allowed to vote in NH's presidential primary?

Undeclared voters can choose to vote in the Republican or Democratic primary, but not both. Republicans and Democrats can only vote in their party's primary.

The last day to update your voter registration before the Jan. 23, 2024 presidential primary was Oct. 6, 2023. If you're not registered to vote, you can still do that before the election or at the polls on Election Day.