Season 6 will be the last Season
https://twitter.com/benbocquelet/status/773256731908530177
Ben Bocquelet said this on a tweet that season 6 is ending.
Honestly, like Regular Show, I don't mind this news. Although let's see how the fans take this, hopefully more mature than those crybabies they call RS fans. When it comes to a cartoon ending, I don't complain like babies. I just accept it and move on.
Well, honestly, the show had more ideas and reccuring characters than Regular Show, so I think 6 seasons is good enough for Ben to end it on his own terms. (Quintel recently tweeted, but it's about the next season premiere, rather than confirming if it the last RS season) They were able to flesh out the characters in later seasons and I can see why season 3 is an improvement. Season 4 is not my favorite, but hopefully the last two seasons are great.