Right after season 5 begins on ABC (Sep 24) TNT will begin airing Castle on a regular basis. TNT's Castle schedule begins on Wednesday September 24th and will air both during the day and in the evenings.
TNT bought the syndication rights to air Castle last year and started out by airing an 8 episode marathon last September but this is the first time TNT will air the episodes in order, starting with "Flowers For Your Grave" at 12pm on Wednesday September 26 and airing the next 8 episodes the same day. See our schedule page for details.
Castle will also air on weekends this fall in local broadcast syndication (in NYC Sunday nights at 12am & 1am on WABC).