Rainbow Jello Cubes are wonderfully easy and delicious and perfect for St. Patrick’s Day or any day you want to bring a smile to someone’s face!
This easy treat is great for parties and crowds. This simple recipe makes a ton of rainbow jello that you can cut into cubes or other shapes if you prefer. Enjoy!
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Rainbow Jello
If you’ve ever wondered how to make rainbow jello – you’re in the right place. It’s much easier than you might think and the only hard part is the waiting for each layer to set up.
MY LATEST VIDEOSThey layers are absolutely magical and as wonderful as they are to look at, they’re even more fun to eat.
You can pick the colors and flavors you would like to use to make your rainbow jello. I went with red, orange, green and blue for this batch. Feel free to make as few or many layers as you like.
This particular recipe just happens to work for St. Patrick’s Day! It’s so fun to make and easy too! The boys love picking out their favorite flavors of jello and then I put it all together. I say jello “flavors” but really they go by color. You know…”the red jello” or “the green jello”. Whatever works 🙂
Not only is this dessert beautiful and super-impressive {it looks like it’s really hard to make} but it’s easy on the wallet as well.
You only need some jello, a can of sweetened condensed milk, and some unflavored gelatin. Easy peasy! You can choose whatever colors you like which makes this a very versatile dessert. Layer in the colors of your next party and you’re going to have a yummy treat that’s sure to be a hit!
There’s just something about rainbow jello that bring a smile to my face every time. My boys are also thrilled when I “make rainbows” in the kitchen – they are also HUGE jello fans so this treat is a win-win for everyone.
You can really cut down the calories and sugar in this dessert by using sugar-free jello and low-fat or fat-free sweetened condensed milk. Oh and did I mention this recipe makes TONS of cubes?? Like literally, tons. Depending on how precise I am with my cutting, I usually end up with between 60-80 cubes so there’s plenty for a crowd OR class!
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How To Make Rainbow Jello
- 4 packages (3 ounces each) assorted flavored gelatin
- 6 envelopes unflavored gelatin, divided
- 5-3/4 cups boiling water, divided
- 1 can (14 ounces) sweetened condensed milk
- ¼ cup cold water
- In a small bowl, combine one package flavored gelatin and one envelope unflavored gelatin. Stir in 1 cup boiling water until dissolved. Let mixture cool slightly for 3-5 minutes.
- Pour mixture into a 13-in. x 9-in. dish coated with cooking spray.
- Refrigerate until set but not firm, about 20 minutes.
- In small bowl, combine the condensed milk and 1 cup boiling water.
- In another bowl, sprinkle two envelopes unflavored gelatin over cold water; let stand for 1 minute. Stir in ¾ cup boiling water. Add to sweetened condensed milk mixture.
- Spoon 1 cup of the creamy gelatin mixture over the first flavored gelatin layer. Refrigerate until set but not firm, about 25 minutes.
- Repeat from beginning of recipe twice alternating flavored gelatin with creamy gelatin layers.
- Make sure to let the dissolved gelatin sit for a few minutes before spooning over previous layer. This will keep the layers "pure".
- Chill each layer until set but not firm before spooning next layer on top.
- Make final flavored gelatin and spoon over top.
- Refrigerate for 2 hours after finishing last layer before cutting into 1-in. squares.
- Serve and enjoy!
Post originally published February 25, 2013. Updated February 20, 2018.
We are having so much fun decorating and preparing for St. Patrick’s Day this year! I’d love to know if your family celebrates St. Patrick’s Day and what you do in your home! Here are some other fun St. Patrick’s Day ideas:
For all St. Patrick’s Day ideas, go HERE.
For all dessert recipes, go HERE.
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Shelley says
Hi the sweetened condensed milk plus boiling water curdles (followed step 4 as written)! 🙁 Should I have added it to cold water? Please advise!
Monika Wrobel says
Hello Trishl,
Thank you for this! My mother started making this for us back in 1966. I remember the first time she made it, she got the recipe from her best friend who got it from a magazine. We have made it for generations now. The difference is we use whole milk, instead of the canned. It’s perfect for Christmas or other holidays. Our recipe calls it 7 layer jello, or rainbow jello. I have taken it to pot lucks and it’s always one of the first dishes to go!
Monika Wrobel ecently posted.. best baby jumper
Trish - Mom On Timeout says
Such a fun recipe, right? Love that you have so many great memories attached to it 🙂
Alice says
ooooooh, these are brilliant! I love food that looks pretty! My daughter has a thing with rainbows at the moment, so I think these will be perfect for her upcoming birthday party!!!
Tiffany Phelps says
hi, how much water do you sprinkle the two packages of gelatin over in step 2? Thanks
Candice says
Hi, was just curious if you ever figured out how much cold water that is supposed to be?
Trish - Mom On Timeout says
1/4 cup – it’s the last ingredient on the list.
SunCakeMom says
These cubes look so happy they worth making just to look at them 😀 My husband wont have them since he knows that gelatine is made of bones….
Nanga says
I totally failed while attempting this. Not sure if there is a certain way to use gelatin to get it not to be lumpy but it totally failed for me. Not too sure if I was using the wrong stuff here in Australia? Help!
Trish - Mom On Timeout says
What do you mean by failed? Did your gelatin not set up? Did you check the expiration date?
sherry lisenby says
I learned how to make this over 36 years ago but without the unflavored gelatin. You needed 2 boxes of each jello flavor and a couple more of the canned milk. You made one layer normal them in the second layer made with the boiling water but instead of the cold water you use the condensed milk. Following the same way with the 3 other flavors.