Season 13

Season 13 of Arthur premiered in the United States on October 12, 2009 on PBS with "No Acting, Please" and ended on April 9, 2010 with "The Secret Origin of Supernova".

Trivia

 * In some non-US markets, this is the last season to be in the 4:3 SD format.
 * The first season where the official PBS Kids web address is seen at the beginning of the end credits of every episode.