This Lemon Rhubarb Cake is sweet, tangy and SO delicious!

With just a few simple ingredients, you’ll have a perfect dessert that everyone will rave about!

 

 

This lemon cake with rhubarb is a big hit at our house! Especially during rhubarb season!

It’s easy to make and bakes up beautifully.

You’ll love that it’s packed with fresh rhubarb and strawberries. A tangy-sweet combo!

The marshmallows add a fun, gooey layer. And it goes so perfectly with the tartness of the rhubarb!

The lemon cake mix means EASY for you to prepare. Yay!

It’s a crowd-pleaser too! It’s so great for potlucks or family gatherings!

You can serve this rhubarb and lemon cake with ice cream or whipped cream for an extra special treat! Yum!

 

 

What Ingredients Are in Lemon Rhubarb Cake?

These cake ingredients mean you get a perfectly golden brown cake with all that yummy rhubarb flavor!

And if you’ve got a bunch of rhubarb from the farmers market? You’ve definitely go to try this!

Here’s what you’ll need:

• Fresh rhubarb: Rhubarb stalks chopped into small pieces.
• Strawberries: Fresh or frozen, chopped.
• Sugar: To sweeten up the fruit.
• Strawberry Jello: Adds even more fruity flavor.
• Mini marshmallows: For a gooey, fun layer.
• Lemon cake mix: Prepared according to package directions.

Pro Tip: You can use frozen rhubarb if fresh isn’t available. Just be sure to thaw and drain it well.

If you love Rhubarb, try one of these drinks:

• Rhubarb Strawberry Crisp
• Cherry Rhubarb Crisp
• Rhubarb Dessert with Meringue
• Cinnamon Rhubarb Bread
• Rhubarb Muffins
• Rhubarb Punch with Sprite

 

 

How to Make Lemon Rhubarb Cake

The perfect finished cake with a yummy rhubarb topping is headed your way!

As always, the full recipe cards are below:

1. Combine the rhubarb, strawberries, and sugar.
2. Sprinkle the strawberry Jello over the fruit mixture.
3. Top with mini marshmallows.
4. Prepare the cake batter with wet ingredients.
5. Pour batter over the marshmallows.
6. When finished baking, flip onto baking sheet so fruit is on the top.
7. Slice and serve with ice cream or whipped cream if you like.

Pro Tips: 

• Be sure to let the cake cool slightly before flipping it to avoid a sticky mess.
• If the top starts to brown too much, just cover it with foil for the rest of the baking time.
• Be sure you’re using a preheated oven. Cakes need exact heat for the oven temperature!
• You can put parchment paper on your sheet pan if you want to make sure the cake doesn’t stick.

 

 

Can I Use Frozen Rhubarb in Lemon Rhubarb Cake?

Yes, you can absolutely use frozen rhubarb in this pound cake type recipe!

Just make sure to thaw it completely.

And drain any excess liquid. That’s important.

Frozen rhubarb can sometimes be a bit more watery, so draining it well is so important.

This will help the cake bake up nicely without being too soggy.

Frozen rhubarb is a great option when fresh isn’t in season.

 

 

How Long Does Lemon Rhubarb Cake Last?

Lemon Rhubarb Cake will last about 2-3 days at room temperature.

If you want it to last longer, you can store it in the fridge for up to a week.

Though honestly, once you try this new recipe, I doubt you’ll let it sit that long!

Get ready for a late night raiding of the cake container!

 

 

Can I Freeze Lemon Rhubarb Cake?

Yes, you can freeze Lemon Rhubarb Cake.

First, let the cake cool completely before wrapping it tightly in plastic wrap and then in foil.

Freeze for up to 3 months.

When you’re ready to enjoy it, just thaw the cake in the refrigerator overnight.

Warm it up in the oven or microwave before serving.

But just be careful not to cook it again. You want it warm. Not burned.

How to Store Lemon Rhubarb Cake

Store strawberry rhubarb upside down cake in an airtight container at room temperature.

Or you can keep it in the fridge.

Just make sure to cover it well to prevent it from drying out.

That’s what will ruin the top of the cake faster than anything else.

 

 

What to Serve with Lemon Rhubarb Cake

Rhubarb and lemon cake is delicious on its own.

But it’s even better with a scoop of vanilla ice cream! 

Or maybe a lemon glaze on the top of cake! With a sprinkle of icing sugar? So pretty!

Or a dollop of whipped cream! Yum! With a cup of tea? Perfect!

It’s a great dessert for spring and summer gatherings!

So if you need a few ideas for a dessert buffet, try some of these:

• Strawberry Crisp Recipe
• Pear Crumble Recipe
• Fresh Fruit Salad with Watermelon
• Strawberry Sauce for Cake
• Pear Hand Pies
• Raspberry Ice Cream Recipe
• Disney Pineapple Dole Whip
• Lemon Almond Loaf Cake
• Raspberry Kiwi Salad

 

 

Do You Need to Refrigerate Rhubarb Cake?

Yes, it’s best to refrigerate Rhubarb Cake if you’re not serving it right away.

This helps keep the cake fresh and prevents it from spoiling.

Cover the cake with plastic wrap or store it in an airtight container.

It will keep in the fridge for up to a week.

Let the cake come to room temperature before serving, or warm it up in the microwave.

 

 

Next time you’re looking for the perfect cake, try this Lemon Rhubarb Cake!

It’s easy, delicious, and great for using up any remaining rhubarb from your garden!

 

Originally Posted: June 7, 2017

Photos & Text Updated: May 19, 2025