Idaho has Election Day Registration. 

Any person who is eligible to vote may register and vote on election day by appearing in person at the polling place for the precinct in which he/she maintains residence and:

• By completing a registration card.
• Making an oath in the form prescribed by the Secretary of State.
• By providing proof of residence. All documents used in providing proof of residence shall be accompanied with some type of photo I.D.

The following documents showing the registrant's current address in the precinct are authorized:
- a valid Idaho driver's license issued through the department of transportation
- a valid Idaho identification card issued through the department of transportation
- any document which contains a valid address in the precinct together with a picture identification card

Students may also use a current valid student identification card from a post secondary educational institution in Idaho accompanied with a current student fee statement that contains the student's valid address in the precinct together with a picture identification card.

For more information, click here.  Or contact your local election office - link on right sidebar.