COLORADO

Primaries:

• Democratic congressional and state primaries: open

• Republican congressional and state primaries: open

• Democratic Presidential primary: open

• Republican Presidential primary: open

Primary Type Definitions

Registration:

• As of 2016, Colorado has an open primary for presidential, federal, and state elections.

Details of voting in congressional and state primary elections:

• Voters do not declare affiliation with a party in order to vote, but they must choose one party's ballot.