The fourth season of The Backyardigans aired from October 1, 2009 to May 3, 2010. It contains twenty episodes.



  • This is the second and final season in 16:9 widescreen and with a picture format of HDTV/1080i.
  • Nickelodeon did not normally air episodes from this season in widescreen format until July 2013.
  • This season is available on Nickelodeon's video-on-demand service.
  • This season has been released to the Canadian iTunes store.
  • Chris Grant Jr., becomes the new voice for Tyrone in this season
  • Uniqua, and Austin, get new singing voices in this season. Avion Baker, and Nicholas Barasch respectively.