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A slice of watermelon cake being lifted from a platter.
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5 from 1 vote

Watermelon Cake

This Watermelon Cake is a fun summer dessert that looks and tastes just like a watermelon! All you need is white cake mix, watermelon Jello, and a handful of other ingredients.
Prep Time30 minutes
Cook Time35 minutes
Total Time1 hour 5 minutes
Course: Dessert
Cuisine: American
Keyword: cake, cake recipe, summer dessert
Servings: 10 servings
Calories: 491kcal


  • 9" round cake pans
  • stand mixer fitted with a paddle attachment


  • 1 box white cake mix
  • 1 3oz box watermelon Jell-O
  • 1 ¼ cups water
  • 2 large eggs
  • ¼ cup canola oil
  • 2 ½ cups vanilla frosting
  • red and green gel food coloring
  • chocolate chips for decoration


  • Preheat the oven to 350℉. Grease and flour two 9” round cake pans.
  • In the bowl of a stand mixer fitted with the paddle attachment, add the cake mix, Jell-O, water, eggs, and oil. Beat on medium speed for 2 minutes until smooth.
    1 box white cake mix, 1 3oz box watermelon Jell-O, 1 ¼ cups water, 2 large eggs, ¼ cup canola oil
  • Split the batter evenly between both prepared cake pans. Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Let cool in the pan for 10 minutes before removing and placing on a rack to finish cooling completely.
  • Set aside 2 tbsp of frosting for garnish. Place 1 ¼ cups of frosting in a bowl and tint with red coloring. Tint the remaining frosting green. Set aside.
    2 ½ cups vanilla frosting, red and green gel food coloring
  • Place one cake layer on a serving plate and frost the top with red frosting leaving a ¼” around the edge. Place the remaining cake on top and frost with remaining red frosting leaving ¾” around the edge. Frost the remaining areas of the cake with green. Pipe the leftover white frosting where the red meets the green on top. Decorate with the chocolate chips.
    chocolate chips for decoration


Serving: 1serving | Calories: 491kcal | Carbohydrates: 81g | Protein: 3g | Fat: 17g | Saturated Fat: 3g | Polyunsaturated Fat: 6g | Monounsaturated Fat: 7g | Trans Fat: 0.2g | Cholesterol: 33mg | Sodium: 477mg | Potassium: 63mg | Fiber: 1g | Sugar: 58g | Vitamin A: 48IU | Calcium: 121mg | Iron: 1mg