The fourth season of Big City Greens premiered on Disney Channel on September 23, 2023, and ended on August 9, 2025. This season focuses on the adventures of the Green family who, after "Long Goodbye", are now constantly going back and forth between Big City and Smalton, while unaware that Chip Whistler is still alive and plotting huge revenge on them and all of Big City for banning him. This season also marks the official debut of Nick Mulligan, Nancy Green's deadbeat crook of a father (who previously had appeared in two episodes as a flashback).
The series features the voices of Chris Houghton, Marieve Herington, Bob Joles, Artemis Pebdani, Zeno Robinson, Wendi McLendon-Covey, Anna Akana, and Billy West. Guest stars in this season include Michael Bolton, June Diane Raphael, Tom Green, Brad Marchand, Margo Martindale, Justin McElroy, Tim Meadows, Dean Norris, Ms. Pat, Tim Robinson, Paul Scheer, Amy Sedaris and Trevor Wallace.
Big City Greens was renewed for a fourth season on January 21, 2022, ahead of the third season's premiere, alongside a . By October 2022, ten episodes had been completed. The season premiered on Disney Channel on September 23, 2023. Episodes for the fourth season did not air as constantly as previous seasons, with five episodes released in 2023 and seven in 2024, due to the crew focusing on finishing production of the movie which aired after episode 9.
The episodes are ordered by their original broadcast order, not their production order. <onlyinclude> </onlyinclude>