[header] How to absentee vote in wisconsin [title] Make sure you are registered to vote. [step] For many first-time voters, registration dates and deadlines are easily missed. A prospective voter must register at least 20 days before election day. 
If registering by mail, the elector (the person who trying to vote) must have the registration postmarked 20 days before election day. If the registrant turns in their registration in person, then they must turn it in at least 20 days before the election.