Rhubarb Crisp

Spring and rhubarb belong together, just like a warm kitchen and happy memories. This old-fashioned Rhubarb Crisp perfectly captures that feeling — the zingy, sweet-tart rhubarb nestled under a golden, buttery oat topping that’s crisp to the bite. It smells like home as it bakes and tastes like a recipe handed down through the family.

In this post, you’ll find a straightforward, pantry-friendly recipe that comes together quickly. The crisp features a pressed oat crumble base, a simple sugar sauce to set the fruit just right, and then a quick bake to make the edges bubble and the topping turn that perfect golden brown. Plus, I’m sharing easy substitutions and tips—whether you want to use fresh or frozen rhubarb, add fresh strawberries, or even make a gluten-free version. And of course, storage and freezing hacks are included so you can prep ahead or save leftovers.

This dessert is easy to prep, loaded with those nostalgic spring flavors, and absolutely wonderful served warm with vanilla ice cream or whipped cream on top.

Why You’ll Love It

• Made with simple ingredients you probably already have in your pantry
• Perfect way to use fresh or frozen rhubarb
• A classic dessert that’s a crowd-pleaser every spring
• Deliciously sweet and tart, with a crunchy oat topping
• Easy to make, and even easier to enjoy

• Only needs everyday pantry staples
• Perfect for fresh or frozen rhubarb
• Classic spring dessert everyone loves
• Balanced sweet and tart fruit with a crunchy oat topping
• So easy to make, hard to resist

Ingredients and Handy Substitutions

• chopped rhubarb
• all-purpose flour
• oatmeal – quick oats work too if you prefer a softer topping
• light brown sugar – dark brown sugar gives a richer, deeper flavor if you want
• melted butter – can use margarine or coconut oil for a dairy-free option
• ground cinnamon
• granulated sugar
• cornstarch – arrowroot powder works as a great substitute here
• cold water
• vanilla extract

How to Make It

1. If using frozen rhubarb, thaw completely and drain off any excess liquid.
2. Press the oat crumble firmly into the bottom of a baking dish to form a base.
3. Spread chopped rhubarb evenly over the pressed oat base.

4. Pour the sugar sauce over the rhubarb to coat and set the fruit.

5. Sprinkle the oat crumb topping evenly over the rhubarb and sugar sauce.
6. Bake until the edges bubble and the topping is golden brown.

7. Let the crisp cool a few minutes so the sauce thickens before serving.

   

Tips for a Perfect Crisp

• If you use frozen rhubarb, be sure to thaw it completely and drain off any extra liquid to keep your crisp from getting soggy.
• Press the oat crumble firmly on the bottom – it helps create a nice, sturdy base that holds everything together.
• Give it at least a few minutes to cool before digging in. This lets the sauce thicken up so it doesn’t run all over the plate.

• Be sure to thaw frozen rhubarb completely and drain it so your crisp isn’t watery.
• Press the oat crumble down firmly to create a nice, sturdy base layer.
• Let the crisp cool for a little before serving so the filling thickens up perfectly.

Flavor Variations and Mix-Ins

• Rhubarb and strawberry combo – Try swapping half the rhubarb for fresh sliced strawberries for a sweeter, seasonal twist.
• Add chopped nuts – Toss in some chopped pecans or walnuts in the topping to add an irresistible crunch.
• Make it gluten free – Use a gluten-free flour blend and certified gluten-free oats to keep it safe for those with sensitivities (the blend used in this foolproof gluten-free vanilla cake works well).
• Rhubarb crisp with oats and coconut – Stir in ¼ cup shredded coconut to the topping for a sunny, tropical spin.

• Rhubarb and strawberry combo – Swap out half the rhubarb for sliced strawberries to brighten up the flavor.
• Add chopped nuts – Stir in chopped pecans or walnuts for a crunchy twist in the topping.
• Make it gluten free – Use gluten-free flour and certified gluten-free oats to keep it safe and delicious.
• Rhubarb crisp with oats and coconut – Add ¼ cup shredded coconut to the crumb topping for a hint of tropical sweetness.

Make-Ahead and Storage Tips

Did you know you can freeze Rhubarb Crisp? It’s a great make-ahead dessert or a way to save leftovers for later. For another bake-ahead treat, try our Homemade Baked Donuts.

To freeze before baking, prepare the crisp up to the point of baking. Wrap tightly in plastic wrap, then cover with a layer of aluminum foil or the casserole dish lid, if you have one. When you’re ready to bake, thaw it completely, peel off the plastic and foil, and bake as usual.

To freeze after baking, let the crisp cool completely, then wrap it well in plastic wrap and cover with foil or the dish lid. When you want to enjoy it, thaw fully, remove wrap, cover with foil, and bake in a 350°F oven until warmed through. Take off the foil for the last few minutes to help crisp the topping back up.

Good news — Rhubarb Crisp freezes really well!

To freeze before baking, prepare the crisp as usual up to the baking step. Wrap it tightly in plastic wrap, then cover with foil or the casserole lid if you have one. When you’re ready to bake, thaw completely, remove the wraps, and bake as directed.

To freeze after baking, cool the crisp thoroughly, then wrap well in plastic wrap and foil or use the lid. When ready to enjoy, thaw the crisp, remove covers, cover it loosely with foil, and warm in a 350°F oven until heated through. Take off the foil near the end to keep the topping crisp.

Frequently Asked Questions

What kind of oats should I use for rhubarb crisp with oats?

Old-fashioned rolled oats work best here because they give that perfect chewy, crunchy texture. Quick oats are fine if you prefer something softer, but the topping won’t have as much bite.

Can I make this ahead of time?

Absolutely! You can assemble the crisp a few hours ahead and then pop it in the oven when you’re ready, or bake it and reheat gently before serving.

Is this rhubarb crisp recipe good with other fruit?

For sure! This recipe works wonderfully with strawberries, apples, mixed berries, peaches, or even a combination of your favorites.

What’s the best way to serve rhubarb crisp?

It’s perfect served warm with a big scoop of vanilla ice cream or a cloud of whipped cream on top. Trust me, your family will thank you!

Does Rhubarb Crisp need to be refrigerated?

Yes, once it’s completely cool, you should refrigerate rhubarb crisp. You can leave it at room temperature for up to 24 hours, but storing it in the fridge keeps it fresher longer and prevents spoilage. Cover your baking dish tightly or transfer leftovers to an airtight container. It will stay good for up to 4 days. Before serving, reheat portions in the microwave or warm the whole dish in the oven at 300°F until hot all the way through.

Why is my Rhubarb Crisp runny?

It’s totally normal for the fruit juices to be a bit runny while the crisp is still warm. The thickener – usually cornstarch – needs some time to set as the crisp cools down, so be patient and it will firm up nicely.

What kind of oats should I use for rhubarb crisp with oats?

Old-fashioned rolled oats are my top pick—they add wonderful texture. Quick oats are okay if you like a softer topping, but you’ll miss some crunch.

Can I make this ahead of time?

Yes! You can put it together a few hours before baking, or bake it and warm leftovers before serving.

Is this rhubarb crisp recipe good with other fruit?

Definitely. It’s delicious with strawberries, apples, mixed berries, peaches, or a mix of your favorites.

What’s the best way to serve rhubarb crisp?

Warm, with vanilla ice cream or whipped cream on top — nothing beats that combo.

Does Rhubarb Crisp need to be refrigerated?

Yes. After the crisp cools completely, keep it in the fridge. It can hold at room temp for a day, but refrigeration keeps it fresh longer and stops spoilage. Cover it well or use an airtight container. It keeps for up to 4 days. Reheat in the microwave or oven before serving.

Why is my Rhubarb Crisp runny?

It’s normal for the fruit juices to be a bit loose when the crisp is warm. The thickener will set once it cools down, so don’t worry if it’s runny right out of the oven.