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Season 3 of Stuck in the Middle was announced on August 31, 2017 by Disney Channel. Production began on September 11, 2017, and wrapped on March 23, 2018. On March 30, 2018, Disney Channel announced that this would be the final season of Stuck in the Middle. The season premiered on December 8, 2017 and the series finale premiered on July 23, 2018.
In this season, there are major changes at the Diaz house. After missing a Christmas family trip to go to France, Rachel gets an opportunity to attend a fashion-design college there. She leaves for France, causing the Diazes to go through a major readjustment. Meanwhile, Harley is turning fifteen, and so she starts preparing for her big quinceañera. Throughout the season, she also struggles not only with her inventions but also with her new neighbor, Aidan - Ellie's cousin. Aidan turns out to be a nightmare for her. Harley feels betrayed when Ethan starts hanging out with Aidan, leading to a BFTF fight. However, on learning about Aidan's family issues, the Diazes start inviting him over and accepting him. Eventually, Harley starts to develop feelings for Aidan. They start dating but Aidan leaves town; only to come back and surprise Harley during her quinceañera.
Among other major changes, Georgie finally gets cut out of the basketball team; but with Harley's push, she joins the dance squad. She also breaks up with her boyfriend, Wyatt. Ethan starts putting more effort into his projects and is able to finally finish a zombie movie which gives him a big shot at becoming a real director. He is also able to start and maintain a relationship with Chloe. Tom's Bait & Bite gets robbed and a few days after getting it back up, it is almost lost to the infamous Pillmans when the Diazes run into them again during a spring break trip.
- Jenna Ortega as Harley Diaz
- Isaak Presley as Ethan Diaz
- Ariana Greenblatt as Daphne Diaz
- Kayla Maisonet as Georgie Diaz
- Nicolas Bechtel as Lewie Diaz
- Malachi Barton as Beast Diaz
- Cerina Vincent as Suzy Diaz
- Joe Nieves as Tom Diaz
- Ronni Hawk as Rachel Diaz (2/20)
- Joshua Bassett as Aidan Peters (9/20)
- Lulu Lambros as Ellie Peters (4/20)
- Alana Baer as Chloe (3/20)
- Olga Mereditz as Abuela (3/20)
- Lauren Pritchard as Bethany Peters (4/20)
- Main article: Episode Guide
- 12/08/17 - Stuck at Christmas - The Movie (301-302)
- 01/19/18 - Stuck with Rachel's Secret (303)
- 01/26/18 - Stuck with a Diaz Down (304)
- 02/02/18 - Stuck in Camp Chaos (305)
- 02/09/18 - Stuck with Harley's Bethany (306)
- 03/09/18 - Stuck in a Nice Relationship (307)
- 03/16/18 - Stuck with Horrible Helpers (308)
- 03/23/18 - Stuck in a Mysterious Robbery (309)
- 03/30/18 - Stuck in a Besties Battle (310)
- 04/06/18 - Stuck in Spring Break (316)
- 04/13/18 - Stuck with a New Squad (311)
- 06/26/18 - Stuck with a Non-Diaz (312)
- 06/28/18 - Stuck in the Dark (313)
- 07/03/18 - Stuck with No Escape (315)
- 07/05/18 - Stuck Wrestling Feelings (317)
- 07/10/18 - Stuck Without the Perfect Gift (318)
- 07/12/18 - Stuck in Diaz Court (319)
- 07/17/18 - Stuck in Dad's Birthday (320)
- 07/19/18 - Stuck in a Fake Out (321)
- 07/23/18 - Stuck in Harley's Quinceañera (314)
- This season featured the first Christmas special of the series.
- On March 30, 2018, Disney Channel announced that this would be the final season of Stuck in the Middle.
- Rachel is no longer a main character this season as she leaves home to go to college in Paris, France. That means:
- The opening theme sequence remains the same despite the changes this season:
- Despite Rachel being moved to a recurring character, she is kept in the opening theme but the credits are edited to remove Ronni Hawk.
- Also, despite the swing set breaking, and the kids rebuilding it in Stuck with Rachel's Secret, the old swing set is still shown during the opening intro.
- The cast had their last table read on March 13, 2018, with the season wrapped 10 days later.
- This is the final season of Stuck in the Middle.
- Stuck in the Middle will be the 16th Disney Channel Original Series to end after three seasons.
- The final nine episodes were released as part of Disney Channel's 2018 Summer GO! promotion, with only the series finale, Stuck in Harley's Quinceañera, premiering during an evening prime time slot.
- Harley appears in every episode this season.
- Rachel becomes a recurring character.
- Ethan, Georgie, Lewie, Beast, Suzy, and Tom were absent for four episodes each.
- Daphne was absent for five episodes, making her the main character that appears in the least number of episodes. However, she might have been absent due to her role in Avengers: Infinity War.
- So far, all of the main cast has appeared in 7 out of the 19 released episodes in season 3.
- So far, Season 3 has had 12 episodes where one or more main cast members are absent.
- "Stuck in Camp Chaos" (Ethan, Tom)
- "Stuck with Harley's Bethany" (Daphne, Georgie)
- "Stuck in a Nice Relationship" (Lewie, Beast, Suzy)
- "Stuck with Horrible Helpers" (Ethan, Daphne, Suzy)
- "Stuck in a Mysterious Robbery" (Georgie)
- "Stuck in a Besties Battle" (Lewie, Beast, Suzy, Tom)
- "Stuck with a New Squad" (Ethan, Daphne, Tom)
- "Stuck with a Non-Diaz" (Daphne)
- "Stuck in the Dark" (Georgie, Lewie, Beast)
- "Stuck Wrestling Feelings" (Ethan, Daphne, Tom)
- "Stuck Without the Perfect Gift" (Suzy, Georgie)
- "Stuck in Dad's Birthday" (Lewie, Beast)
- This episode has not aired yet, but has confirmed appearances based on leaked images/table reads.
- "Stuck in Harley's Quinceañera" (Harley, Lewie, Beast, Daphne, Georgie, Ethan, Suzy, Tom)