If you want to vote in the November 8, 2016, general election, you must register to vote by no later than Tuesday, October 11, 2016.
(If you are already registered to vote, then going to one of these sites will help you verify that you are registered.
For instance. My highly politically opinionated wife (hint: not a Trump supporter) just realized she doesn’t know where her 2016 voter registration card is. Cobbler’s family. No shoes.)