Season 4, alternatively titled Project Rainbow of Rainbow High ran through 2023.
This season had mostly the same animation as the previous three seasons, but there are some animation quality improvements that can be seen throughout the episodes.
The show was announced to be returning on the official Rainbow High Instagram account on April 14th, 2023 with a new season.
Season premise
New projects, new twists, and a whole lot of FUN! This season, 16 lucky students from Rainbow High and Shadow High will work together to create the best fashions designs in Project Rainbow! Only one can be crowned the winner, but everyone will learn new skills and make new friends!
Episodes
| Episode No. | Episode Name | Video | Plot | Airdate |
|---|---|---|---|---|
| 1 | Introducing Project Rainbow 💋 | 
|
This season on Rainbow High, 16 talented fashion designers are working together in the one and only Project Rainbow! These future of fashion icons will share inspiration and creativity to make the runway beautiful! With both Rainbow High and Shadow high students participating, it's bound to be a colorful year! | June 8th, 2023 |
| 2 | Shadow High vs Shadow High 🖤 | 
|
These fashionable friends are ready to showcase their unique skills and start sewing! But for this first round, there’s a twist! It’s Shadow High vs…Shadow High!! This round depends on using everyone’s good ideas to create one amazing design. Can they do it before it’s time to walk the runway? And where’s Rainbow High?? | June 23rd, 2023 |
| 3 | Rainbow High vs Rainbow High 🌈 | 
|
Say hi to Michelle, Olivia, Avery, Priscilla, Aidan, Victoria, Skyler and Kim! Last week, Shadow High was in the spotlight, and now it’s Rainbow High’s turn to show the judges what amazing designs they can make when they work together! | July 7th, 2023 |
| 4 | Dress the Hosts! ☀️🌙 | 
|
Sunny and Luna are complete opposites, but that’s what makes them such an exciting sister duo! This week on Project Rainbow, Rainbow High and Shadow High are giving them a fashion makeover! | July 21st, 2023 |
| 5 | The Art of Fashion 🎨 | 
|
The designers from Rainbow High and Shadow High must create a fashion statement inspired by art from around the work room. Kim Nguyen and Karla Choupette are leading their groups, and with so many amazing choices, it’s hard to pick one that speaks to all of them! How will they know when they’ve found their spark?? | August 4th, 2023 |
| 6 | Team Mix-Up! 🌈🖤 | 
|
Rainbow High and Shadow High have proven that they can work with designers from their own groups, but what about other schools? This week, the designers are getting out of their comfort zone to see how well they can work with everyone! | August 18th, 2023 |
| 7 | Project Déjà Vu 👀 | 
|
This week, the designers are going back to the beginning and reusing their first runway looks to create new formal dresses! Rainbow High has to reuse materials from their accessories week, and Shadow High needs to turn their sporty look into high fashion! Can the designers work together under pressure with limited time and resources?? | September 1st, 2023 |
| 8 | Project Malibu ☀️🌊 | 
|
The designers think they’re here for some fun in the sun, but Project Rainbow is only getting started! For this round, they’re using the beautiful blue ocean to inspire an amazing runway look. While this week's leaders Monique and Michelle are ready to work, it seems like some of our besties are struggling to think of new ideas. Can they beat their creative block before it’s time to hit the runway?? | September 15th, 2023 |
| 9 | Out of This World 🎵💫 | 
|
This week on Project Rainbow, the designers must create a look inspired by Delilah Fields' new song "Out of This World" sung by Rainbow High’s new solo artist, Sabrina St. Cloud! | September 29th, 2023 |
| 10 | The Semi-Finals: Part 1✨🕺 | 
|
We are down to the final four designers of Project Rainbow! Ainsley, Avery, Shanelle, and Skyler must design a perfect outfit for the prom dance. | October 20th, 2023 |
| 11 | The Semi-Finals: Part 2✨🕺 | 
|
The final four designers are still hard at work creating a perfect prom dance look for dancing the night away, but it seems like Skyler is a little distracted. Can her friends help her feel better and focus on her designs before it's runway time? | October 27th, 2023 |
| 12 | Project Rainbow Finals: Part 1 👑 | 
|
Let’s give a round of applause for our final three designers: Ainsley, Shanelle, and Skyler! Each designer showcased their talent, artistry, and incredible teamwork this season. Now, they must work individually to prove they have what it takes to win Project Rainbow! But before they face their toughest design project yet, they must take on their first assignment: designing a crown for the Project Rainbow winner! | November 3rd, 2023 |
| 13 | Project Rainbow Finals: Part 2 👑 | 
|
What an amazing season! Every student who stepped into the workroom brought creativity and innovation to every design! Only two designers are left: Skyler from Rainbow High and Shanelle from Shadow High! | November 10th, 2023 |
| 14 | The Big Day Off 🌈 | 
|
But even on their days off, they can’t stop creating! Sunny and Violet are having BFF time, Poppy’s whipping up yummy treats in the kitchen, and Bella and Ruby are brainstorming a new art piece for the Rainbow Union! | November 24th, 2023 |
Trivia
- This season has a full story-arc to it like Season 1.
- This season had a new director, Matt Kelly.
- Season 4's episodes were mostly released worldwide the same time they were released in English, although the Latinomerica, Brazil, and Turkish YouTube channels released them later.
- The Turkish YouTube channel released them later due to them still dubbing the beginning of Season 3.
Gallery
Rainbow High Greece's banner for Season 4.
Rainbow High’s channel banner during episodes 6 - 9
YouTube banner during 1 million subscribers milestone
Original banner on episode 1 release