Voter registration is permanent - if you already did so during your oath-taking then you're set. However, you should re-register kung lumipat kayo, wish to change your political party affiliation, or have changed your name.
For the upcoming presidential primary elections on February 5, the last day to mail in the registration form for California residents is on Jan. 22 . For more information about registration and voting, go to this site: http://www.sos.ca.gov/elections/elections_vr.htm
You may register to vote if you meet the following criteria:
You are a United States citizen
You are a resident of California [or the state of your residence]
You are at least 18 years of age (or will be by the date of the next election)
You are not in prison or on parole for conviction of a felony
You have not been judged by a court to be mentally incompetent to register and vote
To find the deadline to register in other states, just Goggle your state's name and add "voter registration."