Ruby Red Grapefruit Sheet Cake

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Ruby Red Grapefruit Sheet Cake with Grapefruit Cream Cheese Frosting is tender, moist, sweet, and tart. If you like citrus and grapefruit, this flavorful combination is sure to satisfy!

Ruby Red Grapefruit Sheet Cake

You’ll also find my article on How to Soften Cream Cheese useful.

Ruby Red Grapefruit Sheet Cake with Grapefruit Cream Cheese Frosting

The perfect breakfast…er, because grapefruit is great for breakfast, am I right?

That’s my story and I’m sticking to it!

Slice of grapefruit cake on saucer.

This cake is wonderfully dense and moist. The batter is very wet resulting in an almost brownie like cake.

It has a delightful citrus flavor that is clearly grapefruit. There’s no mistaking it for orange, lemon, or lime. It has a unique, mild grapefruit flavor. It’s actually a refreshing cake flavor that you grow to like more and more with every bite!

Slice of cake on saucer.


I smothered this cake in a smooth cream cheese frosting that has a kiss of grapefruit flavor. I used a basic Cream Cheese Frosting and added one tablespoon grapefruit zest to it. However, if you think this is too much grapefruit, you may choose to frost simply with the cream cheese frosting. You really can’t beat the classic!

Fresh grapefruit is available to me all year, so I consider this a year-round dessert. It makes a memorable and pretty cake for birthday celebrations as well as potlucks or entertaining.

Slice of cake on saucer.


  1. I recommend using real butter and not margarine.
  2. You can substitute sour cream or Greek yogurt for the buttermilk. You’ll use 1/2 cup for substitutions.
  3. Additionally, you can use a plain cream cheese frosting, like my Best Cream Cheese Frosting, if you’re concerned with grapefruit overload.
  4. You may also consider adding 1 cup chopped pecans, walnuts, or almonds to the cake batter.

You may also like my Grapefruit Mojito and my Grapefruit Brulee recipe or these recipes.

  1. Fresh Peach Cobbler Bread
  2. Moist grapefruit cake
  3. Healthy Oatmeal Date Breakfast Cookies
  4. Healthy Breakfast Cookie Recipe
  5. Brownie Batter Protein Balls
  6. Healthy No-Bake Chocolate Cookies
Ruby Red Grapefruit Sheet Cake

Ruby Red Grapefruit Sheet Cake with Grapefruit Cream Cheese Frosting

Ruby Red Grapefruit Sheet Cake with Grapefruit Cream Cheese Frosting is a wonderfully dense, moist cake with a unique grapefruit flavor.
Author: Paula
5 from 16 votes
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Save To Your Recipe Box
Prep Time: 15 minutes
Cook Time: 30 minutes
Total Time: 45 minutes
Servings: 15 servings





  • Preheat the oven to 375 degrees F.
  • Spray a 9×13 inch sheet pan with non-stick spray or spread a thin layer of vegetable shortening inside the pan.
  • Stir together the melted butter, 2 tablespoons grapefruit zest, and water.
  • In another bowl, combine flour, sugar, baking soda, salt, and cinnamon. Whisk to combine.
  • Add buttermilk, 1/2 cup grapefruit juice, eggs, extract, and butter mixture.
  • Stir to combine.
  • Pour batter into the prepared 9×13 inch pan.
  • Bake 25 to 32 minutes or until wooden pick inserted in the center comes out clean.
  • Cool 1 hour before frosting.
  • In the bowl of a mixture, combine cream cheese and butter until light and fluffy.
  • Slowly add sugar.
  • When sugar is incorporated, add 1 tablespoon grapefruit zest.
  • Spread evenly over cool cake.
  • Store in the refrigerator.


Recipe from Paula All images and content are copyright protected. Please do not use my images without prior permission that includes copying the ingredient list or entire recipe and posting in the comments on Pinterest for Facebook. If you want to share this recipe, please simply link back to this post for the recipe.


Calories: 518kcal | Carbohydrates: 72g | Protein: 4g | Fat: 25g | Saturated Fat: 15g | Cholesterol: 88mg | Sodium: 380mg | Potassium: 61mg | Fiber: 1g | Sugar: 59g | Vitamin A: 815IU | Calcium: 35mg | Iron: 1mg
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  1. The ingredient list says 1/2 cup grapefruit juice and then the instructions mentions 2T in the cake batter. Does the rest go elsewhere?

    1. Brenda, thanks for catching my error. I have it corrected now in the recipe. 1/2 cup juice and 2 Tablespoons zest goes in the cake. 1 tablespoon zest goes in the frosting. Sorry for the confusion. Paula

      1. Thank you for your quick reply, I look forward to trying this!

  2. I totally agree a breakfast dessert with a healthy kick to start the day! This really sounds interesting. Everyone would be surprised to find grapefruit it their newest favorite cake! Thanks for sharing, Paula.

    Wishes for tasty dishes,

  3. People eat grapefruit for breakfast so I see no reason why I should have a slice of this cake! It looks so moist and delicious, totally worth running a few extra miles for. πŸ™‚

5 from 16 votes (16 ratings without comment)

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