Strawberry-Rhubarb Dump Cake Recipe

Sliced Rhubarb
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  • Total: 70 mins
  • Prep: 10 mins
  • Cook: 60 mins
  • Yield: 4 to 6 Servings

This super easy rhubarb dump cake is made with layers of ingredients, including fresh diced rhubarb, strawberry flavored gelatin and a cake mix. It's a great way to use that spring and summer rhubarb.

Feel free to replace a cup or two of the rhubarb with sliced fresh strawberries or whole frozen strawberries. Top the warm cake with ice cream or sweetened whipped cream.


  • 5 cups of cubed fresh rhubarb (cut in 1-inch to 1 1/2-inch pieces)
  • 1 cup granulated sugar
  • 1 package (3 ounces) of strawberry flavored gelatin (sugar-free works fine)
  • 1 white cake mix (2-layer size, about 18 ounces)
  • 1 1/4 cups water
  • 1/2 cup melted margarine or butter

Steps to Make It

  1. Butter a 9-by-13-by-2-inch baking dish. Heat the oven to 350 F.

  2. Put the cubed rhubarb in the baking dish.

  3. Top with the granulated sugar, then sprinkle the gelatin over the sugar.  

  4. Sprinkle the dry cake mix over the gelatin layer, then pour the water over the cake mix layer.

  5. Drizzle the melted butter over all. Do not stir or mix the ingredients.

  6. Bake in the preheated oven for about 50 to 60 minutes. 

  7. Serve the cake warm with sweetened whipped cream, ice cream, or frozen (thawed) whipped topping.

Recipe Variations

  • Replace the white cake mix with a yellow or butter cake mix.
  • Add 1 cup of sliced fresh strawberries along with 4 cups of rhubarb.

Related Recipe: ​Strawberry Rhubarb Crumb Cake