Key Lime Icebox Cake is a no-bake dessert that delivers all the bright, tangy flavor of key lime pie without turning on the oven or making a crust. Layers of graham crackers alternate with a creamy filling made from cream cheese, sweetened condensed milk, and key lime juice, then the refrigerator finishes the work while the crackers soften into cake-like layers. I keep the lime juice to 1/2 cup — any more can prevent the filling from setting. This dessert travels well to cookouts and can be assembled a day ahead.
This is about as simple as a key lime dessert gets. There’s no stovetop custard, no egg yolks, and no boxed pudding mix. Beat softened cream cheese with sweetened condensed milk and key lime juice, fold in whipped topping, and layer with graham crackers. The result has the same citrus tang you expect from key lime pie but with a no-bake, make-ahead convenience.
My husband is a big key lime fan, and he says this might be his new favorite.
Testing results for key lime icebox cake
- Use 1/2 cup key lime juice, not more. I tested different amounts; a full cup thinned the filling and it never set properly. Half a cup gives clear lime flavor while still allowing the filling to firm up enough to slice.
- Two 8-ounce blocks of cream cheese. Two full bricks (16 ounces total) provide the structure the filling needs. One block leaves the mixture too soft to cut cleanly.
- Chill in the refrigerator, do not freeze to set. Freezing firms the filling quickly but leaves the graham crackers rigid so they shatter when cut. A long refrigerator chill softens the crackers into sliceable layers.
I hope you make this recipe — I think you’ll love it!
P.S. If you want another nearly no-bake citrus dessert, try a Lemon Icebox Pie made with a similar chill-and-slice approach. I sometimes pop the lemon version in the oven briefly to set eggs, but it’s otherwise a make-ahead favorite.
Ingredient notes
Here are a few practical tips about the main ingredients for the best texture and flavor.
Cream cheese. Use two 8-ounce blocks of full‑fat cream cheese, softened at room temperature so the mixture beats smooth and lump-free.
Key lime juice. Bottled key lime juice is convenient and consistent; fresh-squeezed key lime juice will be brighter if you have the time. Measure carefully — this recipe relies on a specific amount to set correctly.
Whipped topping. You need two 8-ounce containers of whipped topping, thawed. Fold one into the filling and spread the other over the top as the final layer. If you prefer, you can use homemade whipped cream (see Variations).
Graham crackers. Honey graham crackers work well — expect about 21 full crackers (roughly a sleeve and a half) for three layers in a 9×13 pan. Break a few to fill corners and edges so each layer is completely covered.
How to make key lime icebox cake
- Beat the softened cream cheese until smooth. Add the sweetened condensed milk and the key lime juice, mixing until combined.
- Fold in one 8-ounce container of whipped topping until no streaks remain.
- Line the bottom of a 9×13-inch dish with a single layer of graham crackers, breaking a few to fit.
- Spoon half the filling over the crackers and spread evenly.
- Add a second layer of graham crackers, then spread the remaining filling.
- Top with a final layer of graham crackers and spread the remaining whipped topping over the surface.
- Cover and refrigerate at least 6 hours, preferably overnight, until the crackers have softened and the filling has set. Garnish with key lime zest before serving, if desired.
Why you chill it, not freeze it
An icebox cake relies on a long refrigerator chill so the graham crackers can absorb moisture from the filling and become tender and cake-like. Freezing speeds up firming of the filling but leaves the crackers hard, so they tend to shatter when cut. Plan for at least six hours in the fridge; overnight produces the creamiest, most sliceable layers.
Variations
- Homemade whipped cream. Whip 4 cups heavy cream with 1 cup powdered sugar until stiff peaks form. Use half for the filling and half for the top if you prefer fresh cream over store-bought whipped topping.
- Gluten-free. Substitute gluten-free graham-style crackers. The filling contains no flour, so the rest of the recipe remains the same.
- Stronger lime flavor. Do not add more juice; instead fold a small amount of finely grated lime zest into the filling to boost citrus aroma without thinning the mixture.
Make-ahead and storage
Make ahead. This dessert benefits from a long chill and is ideal to assemble the day before you plan to serve it. Keep it covered in the refrigerator until serving.
Storage. Store covered in the refrigerator for up to 3 days. If you want to freeze it, wrap the fully set cake tightly in plastic wrap and foil and freeze for up to 2 months; thaw overnight in the refrigerator before serving. Freezing after the cake has fully set is best.
If you make this recipe, please leave a comment and a rating below!
Key Lime Icebox Cake Recipe
A no-bake key lime icebox cake with layers of graham crackers and a tangy cream cheese, condensed milk, and key lime filling. Chill until the crackers soften into sliceable layers.
Prep: 20 minutes • Cook: 0 minutes • Total: 6 hours 20 minutes (including chill) • Servings: 12 slices
Equipment
- 9×13-inch baking dish
- Electric mixer or stand mixer
- Spatula
Ingredients
- 2 bricks (2 × 8-ounce) Philadelphia cream cheese, softened
- 1 can (14-ounce) sweetened condensed milk
- 1/2 cup key lime juice
- 2 containers (2 × 8-ounce) whipped topping, thawed and divided
- 21 graham crackers (approx. 1½ sleeves)
- Key lime zest for garnish (optional)
Instructions
- Beat the softened cream cheese in a large bowl until smooth. Add the sweetened condensed milk and mix until combined, then stir in the key lime juice.
- Fold in one 8-ounce container of whipped topping until no streaks remain.
- Place a single layer of graham crackers in the bottom of a 9×13-inch baking dish, breaking a few to fit corners.
- Spread about half the filling over the graham crackers and smooth it evenly.
- Add a second layer of graham crackers and spread the remaining filling over that layer.
- Top with a final layer of graham crackers, then spread the remaining whipped topping over the surface and smooth.
- Cover and refrigerate at least 6 hours, preferably overnight. Garnish with lime zest and slice to serve chilled.
Nutrition (per slice, approximate)
Calories: 108 kcal • Carbohydrates: 20 g • Protein: 2 g • Fat: 3 g • Sodium: 162 mg
Questions and tips
Storage
Keep the cake covered and refrigerated for up to 3 days. If freezing, wrap well and freeze only after the cake has fully set; thaw overnight in the refrigerator before serving.
Can I use regular lime juice instead of key lime juice?
Yes — regular lime juice works. It will have a slightly different, less floral flavor profile but still be delicious.
Why didn’t my filling set?
Too much lime juice is the most common cause. More than 1/2 cup thins the cream cheese base and prevents it from firming. Make sure you use two full blocks of cream cheese, measure the juice carefully, and allow enough chill time.
What pan size is best?
A 9×13-inch pan yields about 12 slices with three cracker layers. An 8×8-inch pan will give thicker slices but fewer servings; if you change pan size, adjust the crackers and filling as needed.
How can I boost the lime flavor without thinning the filling?
Stir finely grated lime zest into the filling rather than adding more juice.
How long can it sit at room temperature?
Keep it chilled until serving. It can sit out for a couple of hours at a gathering, but in warm weather return any uneaten portions to the refrigerator promptly.