The TV series Veronica Mars first came out on September 22, 2004, in the United States.

Since you're asking “when did Veronica Mars come out,” here are the two key dates fans usually care about:

  • Original TV series premiere: September 22, 2004 (UPN, in the US).
  • The later Veronica Mars movie: March 14, 2014 (general release).

So if you mean the show, the answer is 2004; if you mean the movie revival, it’s 2014.