Press release from Fox:
The sun will set for the last time on THE O.C. when the series ends its four-season run Thursday, Feb. 22 (9:00-10:00 PM ET/PT) on FOX. The countdown has begun, with all-original episodes airing from Thursday, Jan. 4 through the last episode on Feb. 22.
"THE O.C. Season Four finale will also be the series finale. This feels like the best time to bring the show to its close,” said Josh Schwartz, creator and executive producer of THE O.C. “Thanks to the hard work of our cast, crew and writers, we have enjoyed our best season yet, and what better time to go out than creatively on top. It has been an amazing experience and a great run. For a certain audience, at a certain time, THE O.C. has meant something. For that we are grateful. There has been some speculation about a Season 5 on another network but this feels like the best time to bring the story to an end. I felt better to go out now with the run we're having then try and move the show, etc etc. and maybe not be able to deliver the same level of quality. Teen dramas have a shelf life. We've had a lot of parties on the show, and so I've learned, best not to stay too late.
The ending will be fun and bring real closure to the series."