On October 4, 2017, both Nickelodeon and Mace Coronel announced that they had mutually parted ways for Mace to leave the show before they were done filming season 4.  This means that Dicky will be missing out on the last five episodes of the season.
On November 15, 2017, Nickelodeon announced that this would be the final season of NRDD and will air through 2018
- Lizzy Greene as Dawn Harper
- Casey Simpson as Ricky Harper
- Mace Coronel as Dicky Harper
- Aidan Gallagher as Nicky Harper
- Allison Munn as Anne Harper
- Brian Stepanek as Tom Harper
- Kyla Drew Simmons as Mae Valentine
- Main article: Episode Guide
These are episodes that have confirmed titles and dates.
Below are the known season 4 episodes but no known dates. Note: episode titles are subject to change.
- Dude, Where's My School? (401)
- Nicky, Ricky, Dicky & BeyDawnce (402)
- It's a Hard Knocks Life (403)
- Sympathy for the Squishy (404)
- Leader of the Stack (405)
- The Harper Quad-Jobbers (406)
- Wrestle-Mae-nia (407)
- Quadentity Crisis (408)
- Quadbusters (409)
- We'll Always Have Parasites (410)
- Quadcodile Dundee - (411)
- House Crushing for Dummies (412)
- Quadspiracy Theory (413)
- Lasties with Firsties (414)
- Season 4 was confirmed on March 20, 2017.
- Season 4 is a short-length season with only fourteen episodes.
- The season will most likely start at January 6, 2018 since Season 3 ended at the same time of Season 2 and when Season 2 ended, Season 3 aired at January 7, 2017, so if Season 3 ended at the same time of Season 2 it is most likely Season 4 starts on January 6, 2018.
- Lizzy Greene confirmed they had started filming Season 4 on May 9, 2017 and Aidan Gallagher confirmed they had finished filming on September 20, 2017.
- Mace Coronel mutually parted ways with Nickelodeon and left the show in August 2017. He will not appear in the last five episodes. However, if the episodes do not go into production order, he may appear at least once in the last five episodes.
- On Instagram, Kyla Drew Simmons, Allison Munn and Aidan Gallagher made it seem like this was the last season as Nickelodeon does normally end a show at four seasons.
- Following Mace's exit from the series, many of the cast members including Lizzy and Aidan have already posted on social media that they're saying goodbye to their characters, implying that this is the final season.
- The season premiere will be Dude, Where's My School?.
- The season finale will be Lasties with Firsties.
- Aidan Gallagher's voice got deeper this season.
- Miles might turn into a main character since he is Mae's boyfriend and will probably be there for her all the time.
- Principal Tarian will most likely not be there since he was the principal of Edgewood School.
- The first three recurring characters to be confirmed was Miles, Natlee, and Avery.
- New recurring characters include Kipper, Sadie, Gladys, and more...￼
- This is the final season as Nickelodeon cancelled it along With School of Rock according to Deadline.
- If airing on January 6, 2018 and every week after, the season will end in March 2018 but is most likely ending June 2018.