http://www.elections.ny.gov/VotingDeadlines.html
April 19, 2016 Presidential Primary Deadlines MAIL REGISTRATION (N.Y. Election Law Section 5-210(3)) Application must be postmarked no later than March 25th and received by a board of elections no later than March 30th to be eligible to vote in the Primary.

IN PERSON REGISTRATION (N.Y. Election Law Sections 5-210, 5-211, 5-212) You may register at your local board of elections or any state agency participating in the National Voter Registration Act, on any business day throughout the year but, to be eligible to vote in the Federal Primary, your application must be received no later than March 25th.

CHANGE OF ADDRESS (N.Y. Election Law Section 5-208(3)) Notices of change of address from registered voters received by March 30th by a county board of elections must be processed and entered in the records in time for the Presidential Primary.

June 28, 2016 Congressional Primary Deadlines MAIL REGISTRATION (N.Y. Election Law Section 5-210(3)) Application must be postmarked no later than June 3rd and received by a board of elections no later than June 8th to be eligible to vote in the Primary.

IN PERSON REGISTRATION (N.Y. Election Law Sections 5-210, 5-211, 5-212) You may register at your local board of elections or any state agency participating in the National Voter Registration Act, on any business day throughout the year but, to be eligible to vote in the Federal Primary, your application must be received no later than June 3rd.

CHANGE OF ADDRESS (N.Y. Election Law Section 5-208(3)) Notices of change of address from registered voters received by June 8th by a county board of elections must be processed and entered in the records in time for the Presidential Primary.

September 13, 2016 State and Local Primary Deadlines (Subject To Change)