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 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.

Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 15
Author Paula Jones


  • CAKE
  • 1 ruby red grapefruit 3 tablespoon zest, divided, and 1/2 cup juice from grapefruit. You will use 2 tablespoons zest in the cake and 1 tablespoon in the frosting.
  • 1 cup butter melted
  • 1/2 cup water
  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 teaspoon ground cinnamon
  • 1/2 cup buttermilk
  • 2 large eggs
  • 1 teaspoon vanilla extract
  • 8 ounces cream cheese at room temperature
  • 1/2 cup butter at room temperature
  • 1 teaspoon vanilla extract
  • 4 cups confectioners sugar
  • *1 tablespoon grapefruit zest from 3 tablespoons listed above


  1. Preheat the oven to 375 degrees F.
  2. Spray a 9x13 inch sheet pan with non-stick spray or spread a thin layer of vegetable shortening inside the pan.
  3. Stir together the melted butter, 2 tablespoons grapefruit zest, and water.
  4. In another bowl, combine flour, sugar, baking soda, salt, and cinnamon. Whisk to combine.
  5. Add buttermilk, 1/2 cup grapefruit juice, eggs, extract, and butter mixture.
  6. Stir to combine.
  7. Pour batter into the prepared 9x13 inch pan.
  8. Bake 25 to 32 minutes or until wooden pick inserted in the center comes out clean.
  9. Cool 1 hour before frosting.
  11. In the bowl of a mixture, combine cream cheese and butter until light and fluffy.
  12. Slowly add sugar.
  13. When sugar is incorporated, add 1 tablespoon grapefruit zest.
  14. Spread evenly over cool cake.
  15. Store in the refrigerator.

Recipe Notes

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.