Zesty Key Lime Cake with Cream Cheese Frosting Recipe

If you’re looking for the ultimate citrus dessert, this homemade Key Lime Cake with Cream Cheese Frosting delivers. Moist, tender, and bright with authentic key lime flavor, the cake strikes a delightful balance between tangy and sweet. It’s ideal for birthdays, showers, summer gatherings, or any time you want a refreshing, tropical treat. This easy-from-scratch recipe uses real key lime juice and zest for maximum freshness and is finished with a rich cream cheese frosting for a bakery-style result at home.

Unlike boxed mixes, this cake relies on fresh key lime juice and finely grated zest to give it a lively citrus profile. Buttermilk keeps the crumb soft and moist, while a lightly sweetened cream cheese frosting rounds the flavors without overwhelming the lime. Follow the straightforward steps below to bake a showstopping Key Lime Cake that guests will remember.

Why You’ll Love This Key Lime Cake Recipe

Fresh, vibrant key lime flavor that tastes like summer.
Moist, tender crumb thanks to simple ingredients like buttermilk.
Perfect for celebrations or casual gatherings—easy to scale.
Beginner-friendly instructions with no special techniques required.
Pairs beautifully with coconut, berries, or a scoop of vanilla ice cream.
Creates bakery-style results while saving time and money.

Ingredients for the Best Key Lime Cake

For the Cake:

2½ cups all-purpose flour
2½ teaspoons baking powder
½ teaspoon baking soda
½ teaspoon salt
1 cup unsalted butter, softened
2 cups granulated sugar
4 large eggs
⅓ cup fresh key lime juice (or bottled key lime juice if necessary)
1 tablespoon finely grated key lime zest
1 teaspoon pure vanilla extract
1 cup buttermilk

For the Cream Cheese Frosting:

8 oz cream cheese, softened
½ cup (1 stick) unsalted butter, softened
4 cups powdered sugar
1 tablespoon fresh key lime juice
1 teaspoon key lime zest
1 teaspoon vanilla extract
Pinch of salt

Key Lime Cake with Cream Cheese Frosting Recipe

How to Make Key Lime Cake Step-by-Step

Step 1: Preheat and Prepare

Preheat the oven to 350°F (175°C).
Grease and flour three 8-inch round cake pans and line the bottoms with parchment paper for easy removal.

Step 2: Combine Dry Ingredients

Sift together the flour, baking powder, baking soda, and salt in a medium bowl to remove lumps and ensure an even crumb.

Step 3: Cream the Butter and Sugar

In a large bowl, beat the softened butter and granulated sugar until light and fluffy, about three minutes.

Step 4: Add Eggs and Flavorings

Add the eggs one at a time, mixing well after each addition.
Mix in the key lime juice, lime zest, and vanilla until combined.

Step 5: Alternate Dry Ingredients and Buttermilk

Add the dry ingredients and the buttermilk alternately to the butter mixture, beginning and ending with the flour. Mix gently and stop as soon as the batter is combined to avoid a dense cake.

Step 6: Bake the Cake

Divide the batter evenly among the prepared pans.
Bake for 25–30 minutes, or until a toothpick inserted into the center comes out clean.
Let the cakes cool in the pans for 10 minutes, then transfer to wire racks to cool completely.

Step 7: Make the Key Lime Cream Cheese Frosting

Beat the softened cream cheese and butter together until smooth.
Gradually add the powdered sugar and beat until light and fluffy.
Stir in the key lime juice, zest, vanilla, and a pinch of salt. Adjust sweetness or lime intensity to taste.

Step 8: Assemble and Frost

Place one cake layer on a serving plate and spread an even layer of frosting on top.
Repeat with the remaining layers, then frost the top and sides of the cake.
Garnish with extra lime zest or thin lime slices. Chill briefly before slicing to get clean layers.

Expert Tips for a Perfect Key Lime Cake

Use fresh key limes when possible for the best, most aromatic flavor.
Sift dry ingredients to avoid clumps and help create a soft crumb.
Bring eggs, butter, and buttermilk to room temperature before mixing for a smooth batter.
Avoid overmixing the batter; fold gently once ingredients are combined.
For extra citrus brightness, lightly brush each layer with a little extra lime juice before frosting.
Chill the finished cake for 20–30 minutes before slicing to get neat slices and stable frosting.

Best Ways to Serve Key Lime Cake

Serve with a scoop of vanilla ice cream or a dollop of whipped cream for extra indulgence.
Sprinkle toasted shredded coconut on top for a tropical touch.
Garnish with fresh strawberries or raspberries for color and a complementary tart-sweet flavor.

Serving Tip:
Chill the cake slightly before serving to highlight the refreshing citrus flavors and make slicing easier.

Nutritional Information (Per Slice)

Nutrient	Amount
Calories	470 kcal
Carbohydrates	58g
Protein	5g
Fat	24g
Sugar	41g
Fiber	1g

Nutrition calculated using standard ingredients. Actual values may vary based on brands and portion sizes.

Storage and Leftovers

How to Store:

Refrigerate the frosted cake in an airtight container for up to 5 days.
Bring slices to room temperature for the best flavor before serving, or chill slightly for a crisp cut.

Freezing:

Freeze unfrosted cake layers wrapped tightly in plastic wrap and aluminum foil for up to 3 months.
Thaw overnight in the refrigerator before frosting and serving.

Quick Reheat Tip:
Warm a single slice in the microwave for 10–15 seconds to revive moisture and flavor.

Frequently Asked Questions (FAQs)

Can I make the cake ahead of time?
Yes. Bake the layers a day in advance, wrap them well, and frost just before serving for the freshest texture.

Is bottled key lime juice acceptable?
Yes—bottled key lime juice will work if fresh key limes aren’t available, though fresh juice and zest yield the best aroma and flavor.

Can I make cupcakes instead?
Absolutely. Portion the batter into cupcake liners and bake at 350°F for 18–20 minutes.

Substitute for buttermilk?
Stir 1 tablespoon lemon juice or vinegar into 1 cup whole milk and let it sit for a few minutes to create a quick buttermilk substitute.

Key limes vs. regular limes?
Key limes are smaller and more aromatic, offering a tangier, slightly floral taste compared to larger Persian limes.

Related Recipes You’ll Also Love

No Bake Banana Split Cheesecake — an easy, fruity summer dessert.
Old-Fashioned Peach Cobbler — a comforting, classic dessert.
Baked Salmon in Foil with Asparagus — a simple, flavorful dinner idea that pairs well with lighter desserts.

Conclusion

You now have a complete guide to baking a bright, tender Key Lime Cake with Cream Cheese Frosting. With fresh lime juice, a soft crumb from buttermilk, and a tangy-sweet frosting, this cake is a crowd-pleaser that’s both elegant and approachable. Try it for your next gathering and enjoy a slice of sunny citrus bliss.

Did you make this recipe? Share your experience and any tips you discovered while baking—feedback helps others and makes the recipe even better.