Name: Classic Rhubarb Pie
Prep time: 30 min
Cook time: 90 min
Total time: 120 min
Ingredients: 2 lb rhubarb (cut into 1" pieces); 1½ cups granulated sugar; ¼ cup cornstarch; 1 Tbsp lemon juice; ¼ tsp kosher salt; 2 Tbsp butter (cold and cubed); 1 large egg (lightly beaten with ½ tsp. water); to taste sanding sugar (for sprinkling); 2 batches pie dough; for rolling all-purpose flour

This rhubarb pie recipe is the kind of dessert that stops people mid-conversation. That gorgeous ruby filling, the golden flaky crust, the sweet-tart smell drifting through the kitchen — it’s pure comfort in a pie plate. If you’ve got fresh rhubarb and a little time, you’re already halfway there. This recipe walks you through every step, from mixing the filling to achieving that perfectly crimped, golden crust. Get ready to bake a pie that everyone will be talking about long after the last slice is gone.

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Why You’ll Love This Recipe

Simple, honest ingredients. You only need pantry staples and fresh rhubarb to pull this off — no fancy equipment or hard-to-find items required.
Bold, balanced flavor. The tartness of the rhubarb plays beautifully against the sweetness of the sugar, and a splash of lemon juice keeps everything bright and lively.
A stunning presentation. Sanding sugar gives the top crust a sparkly, bakery-worthy finish that makes this pie look as impressive as it tastes.
Make-ahead friendly. The pie freezes before baking, which means you can prep it a day ahead and pop it in the oven when you’re ready.
Foolproof technique. Step-by-step instructions with visual cues and timing make this approachable for bakers of every skill level.

Ingredients

2 lb. rhubarb, cut into 1″ pieces (about 7 cups)
1½ cups granulated sugar
¼ cup cornstarch
1 Tbsp. lemon juice
¼ tsp. kosher salt
2 batches pie dough
All-purpose flour, for rolling
2 Tbsp. butter, cold and cubed
1 large egg, lightly beaten with ½ tsp. water
Sanding sugar, for sprinkling

Notes & Substitutions: If your rhubarb stalks are very thick, cut them in half lengthwise before slicing into 1″ pieces so the filling cooks evenly. Granulated sugar can be swapped with an equal amount of cane sugar. No sanding sugar on hand? Turbinado or coarse raw sugar works just as well and gives a lovely crunch. Store-bought pie dough is a totally acceptable shortcut if you’re short on time.

Instructions

Make the filling. In a large bowl, combine the rhubarb, granulated sugar, cornstarch, lemon juice, and kosher salt. Toss everything together until the rhubarb is well coated. The cornstarch is key here — it thickens all those delicious juices as the pie bakes so your filling sets up perfectly instead of running everywhere.
Roll out the dough. Lightly flour your work surface and roll each batch of pie dough into a 12″ round. You want them even in thickness so the crust bakes uniformly. Fit one round into a 9″ glass pie plate, letting the edges hang over the sides.
Fill and cover. Pour the rhubarb mixture into the pie shell and spread it out evenly. Dot the top of the filling with the cold, cubed butter — this adds richness and helps the filling stay silky. Lay the second dough round over the top. Trim any overhanging dough to about 1″, then fold the edges of the top crust under the bottom crust and crimp them together firmly to seal.
Vent and freeze. Using a sharp knife, cut five 1″ slits arranged in a circle in the center of the top crust. These vents let steam escape, which prevents the crust from puffing and cracking. Transfer the pie to the freezer and chill for 30 minutes. This step helps the crust hold its shape and crimp beautifully.
Preheat the oven. While the pie is in the freezer, preheat your oven to 375°F. Set one rack in the middle position and another in the bottom third. Place a foil-lined baking sheet on the lower rack to catch any drips.
Egg wash and sugar. Pull the pie from the freezer and brush the entire top crust with the egg wash, getting into all the crimped edges. Sprinkle generously with sanding sugar for a sparkly, golden finish.
Bake. Set the pie on the middle rack and bake for about 1 hour. Check periodically — if the top crust starts browning too quickly, tent it loosely with foil. Continue baking, checking every 10 minutes, for about 30 minutes more. The pie is done when the filling is bubbling in the center and the bottom crust looks golden.
Cool completely. Transfer the pie to a wire rack and let it cool completely before slicing. This allows the filling to set so it slices cleanly.

Pro Tips & Troubleshooting

Most common mistake: Skipping the freeze step. Chilling the assembled pie for 30 minutes is not optional — it keeps the butter in the dough cold, which is what creates those flaky layers.

Technique tip: When crimping the edges, press firmly so the top and bottom crusts are fully sealed. A loose seal means the filling can bubble out from the sides.

Troubleshooting: If your filling looks watery after baking, the pie likely needed more time. The center must be actively bubbling — not just around the edges — before you pull it from the oven. Don’t rush it.

Serving, Storage & Variations

Serving: Let the pie cool fully before slicing — at least 2 to 3 hours. Serve with a scoop of vanilla ice cream or a dollop of freshly whipped cream for the ultimate pairing.

Storage: Store leftover pie loosely covered at room temperature for up to 2 days, or refrigerate for up to 5 days. To reheat, place slices in a 300°F oven for 10–15 minutes until warmed through.

Variations:

Strawberry-Rhubarb: Replace half the rhubarb with fresh, hulled strawberries for a classic combination.
Ginger-Rhubarb: Add 1 teaspoon of freshly grated ginger to the filling for a warm, spicy kick.
Lattice Top: Skip the solid top crust and weave a lattice for a show-stopping, bakery-style look.

Nutrition Information

Nutrition is estimated per serving based on 8 slices. Values will vary depending on your pie dough recipe and exact ingredients used.

Nutrient	Per Serving
Calories	420 kcal
Protein	4 g
Carbohydrates	68 g
Fat	16 g
Fiber	2 g
Sugar	38 g
Sodium	210 mg

Frequently Asked Questions

Can I use frozen rhubarb for this rhubarb pie recipe?

Yes, frozen rhubarb works well — just thaw it completely and drain off any excess liquid before mixing with the other filling ingredients. This prevents a watery filling.

Why does my rhubarb pie filling come out runny?

The most likely culprit is underbaking. The filling must be bubbling all the way in the center, not just at the edges, to fully activate the cornstarch thickener.

Can I make this pie ahead of time?

Absolutely! You can assemble the pie and freeze it unbaked for up to 1 month. Bake it straight from the freezer, adding about 15 extra minutes to the total bake time.

Conclusion

There’s something deeply satisfying about pulling a golden, bubbling rhubarb pie out of the oven. From the tangy-sweet filling to that shimmering, crispy crust, every single bite is worth it. Whether you’re baking this for a summer gathering, a holiday table, or just a cozy weekend at home, this recipe delivers every single time. Give it a try and let us know how it turns out! Drop a comment below, leave a star rating, or tag us on social media with your beautiful pie — we absolutely love seeing your bakes.