Question: how many episodes are in season 4 of greys anatomy
Answer: of episodes 17 Release Original network ABC Original release September 27 , 2007 ( 2007 - 09 - 27 ) -- May 22 , 2008 ( 2008 - 05 - 22 ) Season chronology ← Previous Season 3 Next → Season 5 List of Grey 's Anatomy episodes