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Rhubarb Dump Cake

Published: Aug 27, 2025 by Patricia Collins

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As the first hints of spring arrive, I find myself reminiscing about the delightful afternoons spent in my grandmother's kitchen, where she would whip up her famous Rhubarb Dump Cake. The tangy sweetness of fresh rhubarb, combined with a golden, crumbly topping, fills the air with a comforting aroma that wraps around you like a warm hug. This recipe is incredibly simple, making it perfect for family gatherings or a cozy evening dessert, and it always leaves everyone wanting more.

Rhubarb Dump Cake - detail 1 this …

What Is Rhubarb Dump Cake?

Rhubarb Dump Cake is a delightful and easy dessert that layers fresh rhubarb with a sweet, cake-like topping, creating a wonderful balance of tart and sweet. This dish is perfect for spring gatherings, showcasing the vibrant flavor of rhubarb in a comforting and satisfying way.

  • Prep Time: 15 minutes
  • Cook Time: 45 minutes
  • Total Time: 60 minutes
  • Servings: 8 pieces

Why You'll Love Rhubarb Dump Cake

  • Quick Preparation: This cake comes together in just a few simple steps, making it perfect for busy weeknights or last-minute gatherings.
  • Simple Ingredients: With just a handful of pantry staples, you can create a delicious dessert without any fuss.
  • Beginner-Friendly: Even novice bakers can confidently whip up this cake, ensuring everyone can enjoy a homemade treat.
  • Perfect for Gatherings: Its delightful balance of sweet and tart flavors makes it a crowd-pleaser at potlucks and family dinners.
  • Make-Ahead Convenience: Prepare it in advance and simply reheat when ready to serve, allowing you to enjoy more time with loved ones.

Ingredients You'll Need

  • 1 pound rhubarb, cut into ¼ inch pieces (approximately 3 to 4 cups) - Fresh rhubarb is ideal, but you can use frozen rhubarb if needed; just thaw and drain excess liquid.
  • 1 cup white sugar - Adjust to taste, especially if your rhubarb is particularly tart.
  • 1 package strawberry gelatin (3-ounce) - This adds a lovely sweetness and enhances the flavor profile of the rhubarb.
  • 1 package yellow cake mix - Any brand will work; opt for a high-quality mix for the best texture.
  • 1 cup water - Using room temperature water helps blend the cake mix better.
  • ¼ cup melted butter - For a richer flavor, you can substitute with unsalted butter or coconut oil.

Step-by-Step Instructions

Preparing the Ingredients

  1. Preheat the oven to 350°F (175°C).
  2. In a mixing bowl, combine the rhubarb pieces, white sugar, and strawberry gelatin. Stir well until the rhubarb is evenly coated with the sugar and gelatin mixture.
  3. Spread the rhubarb mixture evenly in the bottom of a baking dish, ensuring an even layer for consistent cooking.

Mixing the Cake Batter

  1. In a separate bowl, combine the yellow cake mix, water, and melted butter.
  2. Mix until the batter is smooth and well combined. Be careful not to overmix; a few lumps are perfectly fine!

Assembling the Dump Cake

  1. Sprinkle the cake batter evenly over the rhubarb mixture in the baking dish.
  2. Use a spatula to gently spread the batter, but don't worry about covering every inch, as it will spread while baking.
  3. Drizzle any remaining melted butter over the top of the cake batter for added richness.

Baking the Cake

  1. Place the baking dish in the preheated oven and bake for 45 minutes.
  2. Check for doneness by looking for a golden brown top and bubbling rhubarb underneath. A toothpick inserted into the cake layer should come out clean.

Cooling and Serving

  1. Once baked, remove the cake from the oven and let it cool for about 10-15 minutes.
  2. Serve warm or chilled, and consider topping it with a scoop of vanilla ice cream or a dollop of whipped cream for an extra touch of indulgence.
Rhubarb Dump Cake - detail 2

Variations

  • Replace rhubarb with fresh strawberries or peaches for a different fruity twist.
  • Add a teaspoon of cinnamon or nutmeg to the cake mix for a warm, spiced flavor.
  • Try using a chocolate cake mix for a rich chocolatey version.
  • For a gluten-free option, substitute the yellow cake mix with a gluten-free cake mix.
  • Top with crushed nuts or granola for added texture and flavor.

Serving and Storage Tips

Serving

Serve the Rhubarb Dump Cake warm or chilled, with a generous scoop of vanilla ice cream or a dollop of whipped cream on top. It pairs wonderfully with freshly brewed coffee or a cup of herbal tea, making it the perfect dessert for a cozy gathering or family meal.

Storage

Store any leftovers in an airtight container in the refrigerator for up to 3 days. For longer storage, you can freeze the cake for up to 2 months. To reheat, simply warm it in the oven at 350°F (175°C) until heated through, keeping it covered to prevent drying out.

Common Mistakes

  • Using Too Much Rhubarb: Overloading on rhubarb can make the cake too tart and watery. Stick to the recommended amount for the best balance.
  • Not Mixing Ingredients Properly: Ensure all ingredients are well combined to avoid lumps in the cake batter. Mix until just combined.
  • Skipping the Cooling Time: Serving the cake immediately can lead to a messy slice. Allow it to cool for a few minutes for better texture.
  • Baking at the Wrong Temperature: Always double-check your oven temperature; baking too hot can burn the top while leaving the rhubarb undercooked.

Helpful Notes

  • For a sweeter cake, consider adding an extra tablespoon of sugar to the rhubarb mixture.
  • If you're allergic to gluten, use a gluten-free yellow cake mix to make this dessert accessible for everyone.
  • Add a splash of vanilla extract to the cake batter for an extra layer of flavor.
  • Incorporate chopped nuts or oats into the topping for added crunch and texture.

Frequently Asked Questions

Can the recipe be frozen?

Yes, the Rhubarb Dump Cake can be frozen! Once cooled, wrap it tightly in plastic wrap or aluminum foil and place it in an airtight container. It can be stored in the freezer for up to 2 months. When you're ready to enjoy it, simply thaw it in the refrigerator overnight and reheat in the oven.

Can ingredients be substituted?

Absolutely! You can use frozen rhubarb instead of fresh; just make sure to thaw and drain it well. If you don't have strawberry gelatin, raspberry or cherry gelatin can work too. For a gluten-free version, swap the yellow cake mix for a gluten-free alternative. You can also use unsalted butter instead of regular butter for a lighter flavor.

How to store leftovers?

Store any leftovers in an airtight container in the refrigerator for up to 3 days. Make sure it's cooled completely before sealing. If you prefer to keep it longer, freezing is an option. Just follow the freezing instructions mentioned earlier for best results.

Can the recipe be made ahead?

Yes, this Rhubarb Dump Cake can be made ahead of time! You can prepare it the day before and store it in the refrigerator. Simply reheat it in the oven before serving. This makes it perfect for gatherings, allowing you more time to enjoy with your guests!

Final Thoughts

There's something truly magical about sharing a warm slice of Rhubarb Dump Cake with family and friends. Its comforting aroma and delightful flavors will surely bring smiles around the table. I encourage you to try this easy recipe and make it your own, perhaps by adding a personal touch or a favorite topping. Whether enjoyed on a sunny spring afternoon or as a cozy dessert on a chilly night, this cake is bound to become a treasured addition to your home-cooked memories.

Rhubarb Dump Cake

Rhubarb Dump Cake

This Rhubarb Dump Cake is a simple dessert that combines fresh rhubarb with a sweet cake topping.
Print Recipe Pin Recipe
Prep Time 15 minutes mins
Cook Time 45 minutes mins
Total Time 1 hour hr
Course Dessert
Cuisine American
Servings 8 pieces
Calories 200 kcal

Equipment

  • Mixing bowl
  • baking dish

Ingredients
  

For the Cake

  • 1 pound rhubarb, cut into ¼ inch pieces approximately 3 to 4 cups
  • 1 cup white sugar
  • 1 package strawberry gelatin (Jell-O) 3-ounce

For the Topping

  • 1 package yellow cake mix
  • 1 cup water
  • ¼ cup melted butter

Instructions
 

  • Preheat the oven to 350°F (175°C).
  • In a mixing bowl, combine rhubarb, sugar, and strawberry gelatin. Stir well.
  • Spread the rhubarb mixture in a baking dish.
  • Sprinkle the yellow cake mix evenly over the rhubarb.
  • Pour water over the cake mix and drizzle with melted butter.
  • Bake for 45 minutes or until the top is golden brown.

Notes

Serve warm or chilled. You can add whipped cream or ice cream on top for extra flavor.
Keyword easy dessert, rhubarb cake, Rhubarb Dump Cake

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Welcome!

Hi, I’m Patricia—a home cook sharing simple, comforting recipes to bring people together and make everyday meals memorable.

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