Summer Watermelon Poke Cake Recipe with Cream Cheese Filling

Watermelon poke cake was my attempt to capture watermelon flavor in a simple, nostalgic poke cake. Instead of trying to work with fresh watermelon, which adds too much moisture and can be tricky to incorporate, this version uses watermelon-flavored gelatin to deliver the taste without watering down the cake. It’s an easy, fun dessert that brings bright color and a playful flavor to summer gatherings.

Why You Will Like This Recipe

Poke cakes are rewarding and simple: you bake, poke holes, pour in flavored liquid, and top with a light frosting. The watermelon version is especially appealing if you like fruity desserts but want something effortless. Using a watermelon-flavored instant gelatin gives a clear, sweet watermelon note without the extra juice from fresh fruit. This keeps the cake texture light while delivering that familiar, candy-like watermelon flavor.

Ingredients for Watermelon Poke Cake

• Cake mix – Any boxed cake mix will work; yellow or white gives the best look.
• Watermelon gelatin – A small box of watermelon-flavored instant Jell-O provides the signature flavor.
• Diet soda – I recommend Sprite, but any clear-flavored diet soda works to mix the batter and keeps the cake light.
• Unsweetened applesauce – A few tablespoons replace some fat for a lighter batter.
• Cool Whip – Or another frozen whipped topping for frosting.

How to Make Watermelon Poke Cake

See the full recipe card below for exact measurements and nutrition.

• Prepare the cake batter by combining the boxed cake mix with diet soda and unsweetened applesauce. Stir until smooth and fully blended.
• Pour the batter into a greased 13×9-inch pan (or the pan size you prefer).
• Bake at 350°F for 20–30 minutes, or until a toothpick inserted in the center comes out clean.
• Let the cake cool for 5–10 minutes, then poke holes about 1 inch apart across the top using a wooden spoon handle, knife, or fork.
• Prepare the watermelon gelatin according to package directions (usually one cup boiling water and one cup cold water for a 3.4 oz; adjust for smaller boxes). Let the mixture cool slightly but not set.
• Pour the prepared gelatin evenly over the cake, allowing it to fill the holes and soak into the layers.
• Refrigerate the cake for 1–2 hours until the gelatin has set and the cake is chilled.
• Spread whipped topping over the chilled cake and serve.

Other Recipes to Try 

Baked Feta Pasta

Stuffed Italian Sausage

Baked Oats with Peanut Butter

Air Fryer Crispy Fish Sandwiches

Lighter Fettuccine Alfredo Sauce

Watermelon Poke Cake FAQs

If you try this Watermelon Poke Cake, leave a comment to share how it turned out and, if you like, add a photo. It’s always fun to see the color and texture variations people create.

Watermelon Poke Cake

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• Prep Time: 10 min
• Cook Time: 20 – 30 min
• Total Time: 40 min
• Yield: 12
• Category: Easy
• Method: Oven
• Cuisine: American

It’s fun to see the bright color and the contrast between the cake and the whipped topping—this simple poke cake is a cheerful, easy dessert to share.