Somewhat Simple

Key Lime Cake

Jump to Recipe Comment

As an Amazon Associate I earn from qualifying purchases.

This perfectly flavored lime cake topped with a creamy lime frosting is just the right combo of sweet and tart. Every bite bursts with fresh lime flavor that just feels like summertime!

I love indulging on baked goods year-round, but when the weather starts to get warmer, I crave desserts that are fresh and fruity. Strawberry Cake, Lemon Pound Cake, Cherry Hand Pies etc. Today I’m going to share the most DELICIOUS lime cake recipe that is perfectly moist and so simple to make!

a close up of a key lime cake topped made with this easy lime cake recipe sitting on top of a white cake stand. A black and white striped cloth napkin is laying on the counter beneath the cake stand.

Key Lime Cake

Who says key lime has to be a pie? This easy to make key lime cake is sure to make your taste buds fall in love! If you’re looking for an easy dessert that is packed full of fresh lime flavor, this key lime cake is it!

Not only does this cake taste amazing, but it is also super easy to make! You start with a box of lemon cake mix, a package of lime jello mix, and some lime juice. You bake it according to package directions and once cooled, frost it with a creamy frosting that adds even more flavor!

What’s The Difference Between Key Limes and Regular Limes

Key limes have a slightly yellow color while regular limes are green in color. Key limes also smaller, have more seeds and have a more tart flavor than traditional limes. Key limes (also called West Indian or Mexican limes) get their name because they were previously only grown in mass quantities in the Florida Keys until 1926 when a hurricane wiped out the majority of the crops and were subsequently replaced with regular limes (also called Tahitian or Persian limes). While they are no longer grown in large quantities in the U.S., key limes are grown in many other places throughout the world.

the ingredients to make a key lime cake sitting on a counter which include, lime juice, lime jello, cake mix, frosting and eggs

How to Make Key Lime Cake

This semi-homemade lime cake starts from a boxed mix, so you can whip it up in no time at all!

  1. Add the cake mix and lime jello mix to a bowl and mix.
  2. Add the ingredients listed on the back of the cake mix box, but cut the water amount in half and add the rest of the amount in lime juice. (ie. If your cake mix calls for 1 cup of water, use a half cup of water and a half cup of lime juice.)
  3. Mix until combined.
  4. Pour the batter into your prepared pan(s) and bake according to package directions.
  5. Make our amazing lime frosting by mixing together the frosting ingredients, beating until smooth.
  6. Once your cake is cooled completely, spread the frosting on top and dig in!

a round cake pan, pencil, scissors and wax paper sitting on the counter. These are the items you'll need to make a two layered lime cake.

Key Lime Cake Baking Tips

You can certainly make this lime cake into a sheet cake, or use a 9 x 13 pan, but I love the look of a double-layer round cake. To do this, you use the same amount of batter and divide it equally into 2 round cake pans. Instead of spraying each pan with just non-stick spray, line the bottoms with wax paper.

Trace the bottom of the pan onto the wax paper, then cut out the circle with scissors. Before placing your wax paper on the bottom, spray the edges with cooking spray, then dust it with flour. Then you can place your wax paper circles on the bottom, and pour your ingredients right on top! This lets your cake come out of the pan super easily and in one piece. Once cooled, you can peel off the wax paper and you’re ready to start frosting it!

How To Store Key Lime Cake

  • To store an unfrosted lime cake, first wait until the cake has completely cooled. Then cover the entire cake (sides and all) in plastic wrap and place the wrapped cake inside a large Ziploc bag. The cake can stay fresh on the counter at room temperature for about a week like this.
  • If you don’t plan on using the cake within a week, then you’ll need to store this in the freezer. Follow the same instructions above but be sure to write the date on the outside of the bag so you can remember when you put the cake in the freezer. You can keep the lime cake frozen for about 2 months.

 More Easy Lime Recipes

a slice of lime cake on a stack of white plates with rest of the lime cake sitting on a white cake stand in the background.

Easy Key Lime Cake Recipe

Let us know how you like this Key Lime Cake by leaving us a comment below and tagging us on social media! We love to see what you’re up to in the kitchen!

3.91 from 11 votes

Key Lime Cake

This perfectly flavored lime cake topped with a creamy lime frosting is just the right combo of sweet and tart. Every bite bursts with fresh lime flavor that just feels like summertime!

Course Dessert
Cuisine American
Keyword cake, fruit, spring, summer
Prep Time 10 minutes
Cook Time 20 minutes
Total Time 30 minutes
Servings 1 slice
Calories 250 kcal


Cake Ingredients

  • 1 box lemon cake mix
  • 1 box lime jello (3 oz size)
  • oil amount according to cake mix directions
  • eggs amount according to cake mix directions
  • water half of the amount in cake mix directions
  • lime juice to replace the other half of water amount in cake mix directions

Frosting Ingredients

  • 1 container of vanilla frosting
  • 1 1/2 cup powder sugar
  • 1/4 c lime juice


  1. Mix the lemon cake mix according to package directions, EXCEPT substitute half of the water with lime juice, (i.e. if you need 1 1/2 cups of water, use 3/4 cup water and 3/4 cup lime juice) and add the box of lime jello.

  2. Prepare your pan(s) with cooking spray, or by using our wax paper technique found above.

  3. Cook according to package directions.

  4. While cake is cooking, prepare the frosting by placing the powder sugar, premade frosting, and lime juice in a bowl. Beat until smooth.

  5. Once the cake has cooled, remove from pans and take off wax paper if used.

  6. Frost your cake, and enjoy!

Nutrition Facts
Key Lime Cake
Amount Per Serving
Calories 250
* Percent Daily Values are based on a 2000 calorie diet.


a key lime cake topped with a white frosting sitting on a white cake stand with a black and white striped cloth napkin laying on the counter below the cake. the words simple lime cake are written at the bottom of the image.

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating

What type of comment do you have?


  • Erin wrote:
    • Stephanie Dulgarian wrote:
  • Anna wrote:
    • Stephanie Dulgarian wrote:
  • Katerina wrote:
  • Jade Manning wrote:
    • Stephanie Dulgarian wrote:
  • Chrissie Baker wrote:
    • Stephanie Dulgarian wrote:
  • Dee wrote:
    • Stephanie Dulgarian wrote: