There’s something about key lime desserts that feels especially perfect for spring and summer. With its buttery graham cracker crust, silky citrus filling, and soft whipped cream topping, this gluten-free key lime tart is bright, refreshing, and effortlessly elegant.

The filling comes together with just a handful of ingredients and bakes into a silky, citrusy tart with the perfect amount of lime flavor. Finished with soft whipped cream and extra lime zest, this tart is simple enough for casual gatherings but beautiful enough for special occasions and warm-weather entertaining.

Whether you use bottled key lime juice for convenience or fresh key limes for a more classic flavor, this recipe is easy to make ahead and always impressive to serve.

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Why You’ll Love This Recipe

Bright, creamy key lime flavor
The filling is smooth, silky, and perfectly balanced between sweet and tart with plenty of fresh citrus flavor in every bite.

Beautiful yet simple to make
This tart looks elegant and impressive, but the filling comes together with just a handful of ingredients and minimal prep.

Buttery gluten-free graham cracker crust
The crisp graham cracker crust adds the perfect buttery contrast to the creamy key lime filling.

Perfect make-ahead dessert
Since the tart needs time to chill before serving, it’s a great dessert to prepare ahead for spring and summer gatherings.

Easy to customize
You can use bottled key lime juice for convenience or fresh key limes for a more classic flavor, and garnish the tart as simply or elegantly as you like.

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Ingredient Notes

Gluten-free graham crackers
I used Pamela’s Gluten-Free Honey Grahams for the crust. Pulse them into very fine crumbs so the crust presses together easily and holds its shape after baking.

Unsalted butter
Melted butter helps bind the graham cracker crust together while adding rich, buttery flavor.

Egg yolks
The egg yolks give the filling its rich, creamy texture and help it set into a smooth, silky tart.

Key lime zest
A small amount of zest adds extra fresh citrus flavor and enhances the lime aroma throughout the filling.

Sweetened condensed milk
Sweetened condensed milk creates the signature creamy texture and balanced sweetness in classic key lime pie and tart recipes. Be sure to use sweetened condensed milk, not evaporated milk.

Key lime juice
You can use either fresh or bottled key lime juice in this recipe. Bottled juice works very well and is a convenient option if fresh key limes are difficult to find.

Whipped Cream
Soft homemade whipped cream balances the tart citrus filling and adds an elegant finishing touch.

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How to Make Key Lime Tart

See the recipe card below for the full ingredient list, measurements, and instructions.

Step 1: Make the graham cracker crumbs

Break the gluten-free graham crackers into pieces and pulse in a food processor until fine crumbs form. Transfer to a mixing bowl and stir in the sugar and salt.

Step 2: Prepare the graham cracker crust
Add the melted butter and mix until the crumbs are evenly moistened and hold together when pressed.

Step 3: Press and pre-bake the crust
Transfer the crumb mixture to the tart pan and press it firmly into the bottom and up the sides. Pre-bake the crust until lightly golden and fragrant, then let it cool slightly.

Step 4: Whisk the egg yolks and lime zest
In a large bowl, whisk together the egg yolks and lime zest until slightly thickened.

Step 5: Add the sweetened condensed milk
Add the sweetened condensed milk and salt, then whisk until the mixture is smooth and combined.

Step 6: Add the key lime juice
Pour in the key lime juice and whisk gently until the filling is smooth and creamy. Let the filling rest for 5–10 minutes to thicken slightly.

Step 7: Fill and bake the tart
Pour the key lime filling into the cooled crust and spread it into an even layer. Bake until the edges appear set and the center still has a slight wobble when gently shaken.

Step 8: Chill and garnish
Let the tart cool to room temperature, then refrigerate for at least 2 hours. Once chilled, top with whipped cream and garnish with lime zest or lime slices before serving.

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Recipe Tips

Pulse the graham crackers into fine crumbs
Very fine crumbs create a sturdier crust that presses together more easily and gives cleaner slices once chilled.

Adjust the butter if needed
Different graham cracker brands absorb butter differently. If the crust mixture seems dry or crumbly, add an additional tablespoon of melted butter until the mixture holds together when pressed.

Press the crust firmly into the pan
Use the flat bottom of a measuring cup or glass to compact the crust well, especially around the edges and sides. A tightly packed crust is less likely to crumble when sliced.

Use bottled juice for convenience
Bottled key lime juice works beautifully in this recipe and eliminates the need to juice a large quantity of fresh key limes.

Whisk gently after adding the key lime juice
The filling may briefly appear slightly separated after adding the lime juice. Continue whisking gently and it should become smooth and creamy.

Do not overbake the tart
The edges should look set while the center still has a slight wobble. The tart will continue setting as it cools and chills.

Allow enough time for chilling
Chilling helps the filling fully set and makes slicing much easier. For the cleanest slices, chill for at least 2 hours.

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Storage & Make Ahead

Storage
Store the tart covered in the refrigerator for up to 4 days. If possible, wait to add the whipped cream topping until shortly before serving for the freshest appearance.

Make ahead
The tart can be baked and chilled up to 1 day in advance. Add the whipped cream and garnishes just before serving.

Freezing
Freeze the tart without the whipped cream topping for up to 2 months. Wrap tightly in plastic wrap followed by aluminum foil and thaw overnight in the refrigerator before serving.

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Frequently Asked Questions

Can I use regular limes instead of key limes?
Yes. Traditional key lime desserts use key limes, but regular Persian limes work well and still provide a delicious citrus flavor.

Can I use bottled key lime juice?
Yes. Bottled key lime juice works very well in this recipe and saves a significant amount of prep time.

Why did my filling look separated after adding the lime juice?
This can happen briefly as the acid reacts with the dairy in the sweetened condensed milk. Continue whisking gently and the filling should become smooth again.

How do I know when the tart is done baking?
The edges should appear set while the center still has a slight wobble when gently tapped.

Can I make this recipe ahead of time?
Yes. This tart is a great make-ahead dessert because it needs time to chill before serving.

Do I need to remove the tart from the bottom of the tart pan?
No. I prefer leaving the tart on the removable tart pan base because it makes transferring and serving much easier.

Can I make this as a key lime pie instead?
Yes. The filling can also be baked in a standard 8 or 9-inch pie dish, though bake time may vary slightly depending on the depth of the filling.

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Photography by Creating Kaitlin

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