Layered Rainbow Jello Cubes Recipe

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If you’re looking for a dessert that has that wow factor without needing to be a master baker, then this rainbow Jello cubes recipe is for you!

Layered rainbow Jello cubes

I’m going to warn you first, this recipe isn’t fast to make, but it is easy. If you can make Jello, you can make layered Jello cubes. And we can all make Jello, right?

If you’re hanging around at home for the day, all you need are some timers to remind you to add another layer of Jello and that’s it! It’s that easy to make and people will think you’re a Jello superhero.

Tips for making perfect layered rainbow Jello

This recipe is pretty easy, but here are some tips to ensure success.

  • Be patient and don’t rush the layers. Allow the full amount of time for them to set before adding a new layer.
  • Use a glass dish so you can see all of the pretty rainbow layers when serving and so you can make sure they are straight while making the dessert.
  • Make each new batch of Jello right after add a new rainbow layer so it has time to cool.
  • Make the condensed milk layer in two batches so it will be cool but won’t have time to set.
  • Mix the unflavored gelatin first before adding Jello or condensed milk. It doesn’t dissolve as easily as flavored gelatin.
  • Use a measuring cup with a spout to make your Jello and condensed milk layers.
  • Make sure you have a level spot in the fridge for the 9×13 pan. If you need to, put a piece of paper or something else under one side to make sure it’s level so your rainbow layers will be even. 

With these simple tips, you are on your way to making no-fail layered rainbow Jello dessert that everyone will be asking you how you made it. 

How to make rainbow Jello cubes; step by step

Scroll down to the recipe card for all of the ingredients and measurements as well as full instructions. 

How to make rainbow Jello squares

First things first; spray a 9×13 glass or ceramic baking dish with cooking spray. 

Rainbow Jello squares recipe

Next, dissolve half a packet of unflavored gelatin completely in boiling water, then add a packet of Jello and stir until fully dissolved.

Pour the Jello mixture into the bottom of a 9×13 dish and refrigerate for 30 minutes to set.

Rainbow Jello with condensed milk

As soon as the first layer is put in the fridge, dissolve a packet of unflavored gelatin in one cup of boiling water. Add a can of condensed milk to the gelatin mixture and let it cool.

Pour some of the condensed milk mixture and make sure it covers the Jello layer completely. Cool for 30 minutes.

How to make rainbow Jello

Make a second batch of gelatin and flavored Jello and allow it to cool while the condensed milk mixture sets.


Layered rainbow Jello squares

When all of the layers of Jello cooled are set, allow the whole dessert to chill in the refrigerator for at least at hour, then cut it into cubes and serve, 

How to make layered rainbow Jello cubes

How to store layered rainbow Jello

If they are tightly covered, these rainbow Jello cubes can be stored in the refrigerator for about a week or until they start to get that weird rubbery Jello consistency, if they last that long.  

I recommend using a 9×13 dish that comes with a cover like this one from Pyrex or this one from OXO. This way you don’t have to worry about plastic wrap slipping off, because let’s be honest, it always does, or someone not securing the foil properly.  

A covered glass container is also ideal if you will be transporting the rainbow Jello squares.

Try these other fun recipes for kids

Layered rainbow Jello recipe

Layered Rainbow Jello Squares Recipe

Yield: (1) 9x13 dish
Prep Time: 5 minutes
Cook Time: 10 minutes
Additional Time: 5 hours 30 minutes
Total Time: 5 hours 45 minutes

Layered Jello and sweetened condensed milk make a dessert that will be a crowd-pleaser at any gathering.


  • 6 boxes of Jello - red, orange, yellow, green, blue, and purple
  • 6 packets of unflavored gelatin
  • 2 cans of sweetened condensed milk
  • 8 cups boiling water


  1. Spray a 9x13 dish with nonstick cooking spray.
  2. Dissolve 1 tsp (half of a packet) of unflavored gelatin in boiling water. Once fully dissolved, add a packet of Jello to the boiling water and dissolve completely.
  3. Pour the Jello mixture into the bottom of a 9x13 dish. Refrigerate for 30 minutes. Allow the full 30 minutes to make sure it is completely set.
  4. While the Jello is setting in the refrigerator, mix 2 tsp (a full packet) of unflavored gelatin to one cup of boiling water and dissolve completely. Add a can of condensed milk to the gelatin mixture and let it cool while you wait. * (see notes)
  5. When the Jello layer is set, pour one cup of condensed milk mixture over the Jello layer. Make sure the milk layer covers the Jello layer evenly.
  6. Cool for 30 minutes in the refrigerator on a level surface. Make a second batch of Jello and gelatin and let it cool while the creamy layer is setting. 
  7. Pour the next flavored Jello layer over the creamy layer, and allow it to set in the refrigerator for 30 minutes.
  8. Repeat until all layers of Jello and milk are set. 
  9. When the last layer of Jello is poured, allow the whole dessert to cool in the refrigerator for at least an hour. 
  10. Once all the layers are completely set, cut into one-inch squares and serve.


You will have to make a second batch of the condensed milk mixture halfway through. 

Dissolve the unflavored gelatin first for each layer.

Make each new Jello flavor immediately after adding a new layer so it has time to cool.

With a little time and not a whole lot of effort, you now have a crowd-pleasing dessert that you can make for a special occasion or just for fun. Kids and adults alike will love it and think you’re a genius with your amazing Jello skills.

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