If you’re looking for a dessert that captures the essence of tropical paradise, look no further than Key Lime Coconut Cake. This delightful cake combines the tartness of freshly squeezed key lime juice with the rich sweetness of coconut, creating a flavor profile that dances on your palate. Perfect for summer gatherings, birthday celebrations, or simply as a sweet treat, this cake is sure to impress. With layers of fluffy cake, creamy frosting, and an irresistible coconut topping, it’s a dessert that will transport you straight to the beach.
Why Cooks Rave About It

Cooks rave about Key Lime Coconut Cake not just for its vibrant flavors but also for its moist texture and beautiful presentation. The combination of tangy lime and sweet coconut creates a perfect balance, making every bite a delightful experience. The cake is easy to make, and the ingredients are typically found in any kitchen, making it a go-to recipe for bakers of all skill levels. Additionally, the visual appeal of the cake, topped with a generous layer of coconut, adds to its charm, ensuring it steals the spotlight at any gathering.
Ingredient Rundown
To create this tropical delight, gather the following ingredients:
- 6 large eggs – room temperature, for a fluffy cake.
- 1 cup granulated sugar – sweetens the batter perfectly.
- 1 cup all-purpose flour – forms the base of the cake.
- 1 tsp baking powder – helps the cake rise beautifully.
- 1/4 cup freshly squeezed lime juice – adds that zesty key lime flavor.
- 3 tbsp granulated sugar – used for the soaking syrup.
- 3/4 cup warm water – combines with sugar to create a syrup.
- 8 oz cream cheese – softened, for a rich frosting.
- 1 cup granulated sugar – sweetens the frosting.
- 16 oz cold sour cream – adds creaminess and tang.
- 3 tbsp lime juice – freshly squeezed, enhances the frosting flavor.
- 1 tbsp lime zest – from 2 medium limes, for a burst of aroma.
- 2 cups (7 oz) sweetened shredded coconut – adds texture and sweetness.
Recommended Tools
To make the Key Lime Coconut Cake, you’ll need a few essential tools:
- Mixing bowls – for combining ingredients.
- Electric mixer – makes beating eggs and mixing easier.
- Measuring cups and spoons – for accurate measurements.
- 9-inch round cake pans – to bake the cake layers.
- Offset spatula – for spreading frosting smoothly.
- Cooling rack – to cool the cake layers completely.
Mastering Key Lime Coconut Cake: How-To

Creating the perfect Key Lime Coconut Cake is easier than you think! Follow these steps for a delicious result.
1. Preheat the Oven
Start by preheating your oven to 350°F (175°C). This ensures your cake bakes evenly.
2. Prepare the Cake Batter
In a large mixing bowl, beat the 6 large eggs with 1 cup of granulated sugar until the mixture is light and fluffy. Slowly add in 1 cup of all-purpose flour and 1 tsp of baking powder, mixing just until combined. Finally, fold in 1/4 cup of freshly squeezed lime juice to add that signature key lime flavor.
3. Bake the Cake
Divide the batter evenly between two greased 9-inch round cake pans. Bake in the preheated oven for about 25-30 minutes, or until a toothpick inserted in the center comes out clean. Allow the cakes to cool in the pans for 10 minutes before transferring them to a cooling rack to cool completely.
4. Make the Soaking Syrup
While the cakes are cooling, prepare the soaking syrup. In a small saucepan, combine 3 tbsp of granulated sugar with 3/4 cup of warm water. Stir until the sugar dissolves, then set aside to cool.
5. Prepare the Frosting
In a large bowl, beat 8 oz of softened cream cheese with 1 cup of granulated sugar until smooth. Gradually mix in 16 oz of cold sour cream, followed by 3 tbsp of freshly squeezed lime juice and 1 tbsp of lime zest. Beat until the frosting is creamy and well combined.
6. Assemble the Cake
Once the cake layers are completely cooled, use a serrated knife to level the tops if necessary. Place one layer on a serving plate and brush generously with the soaking syrup. Spread a layer of frosting on top, then sprinkle with sweetened shredded coconut. Repeat with the second layer, finishing with a generous amount of frosting on top and around the sides of the cake.
7. Garnish and Serve
Top the cake with any remaining shredded coconut for a beautiful presentation. Chill the cake for at least an hour before serving to let the flavors meld together.
Seasonal Twists

Looking to switch things up? Consider these seasonal twists on the classic Key Lime Coconut Cake:
- Add fresh berries like strawberries or blueberries for a fruity touch.
- Incorporate a layer of mango puree for a tropical twist.
- Drizzle a passion fruit glaze on top for an exotic flavor.
- Use toasted coconut instead of sweetened for a nuttier taste.
Things That Go Wrong
Even the best bakers encounter hiccups. Here are some common issues and how to avoid them:
- Dense Cake: Ensure your eggs are at room temperature and avoid overmixing the batter.
- Frosting Too Runny: Make sure your cream cheese is fully softened before mixing. If it’s too runny, add more powdered sugar to thicken.
- Cake Sticking to Pans: Make sure to grease your pans well or use parchment paper for easy removal.
- Flavor Too Tart: Adjust the amount of lime juice according to your taste preference.
Refrigerate, Freeze, Reheat
To keep your Key Lime Coconut Cake fresh:
Refrigerate any leftover cake in an airtight container for up to 5 days. If you want to save it for longer, you can freeze the cake. Wrap individual slices in plastic wrap and store them in a freezer-safe container for up to 3 months. To reheat, allow the cake to thaw in the refrigerator overnight, and then bring to room temperature before serving.
Common Questions
Can I use bottled lime juice instead of fresh?
While bottled lime juice can be used in a pinch, fresh lime juice provides a more vibrant and authentic flavor, making a significant difference in the overall taste of the Key Lime Coconut Cake.
Can I substitute coconut cream for sour cream?
Yes, you can substitute coconut cream for sour cream for a richer coconut flavor and creamier texture in the frosting.
Is this cake suitable for special occasions?
Absolutely! Key Lime Coconut Cake is perfect for celebrations like birthdays, weddings, or any festive gathering. Its tropical flavor and stunning appearance make it a showstopper.
How do I prevent the cake from collapsing?
Ensure you bake the cake layers until a toothpick comes out clean and that you allow them to cool completely before frosting. The soaking syrup should also be applied in moderation to prevent sogginess.
Complement your Key Lime Coconut Cake with these delightful options:
The Last Word
Creating a Key Lime Coconut Cake is a rewarding experience that results in a dessert bursting with flavor. The balance of tart key lime and sweet coconut makes it a delightful treat for any occasion. Whether you’re a seasoned baker or trying your hand at cake-making for the first time, this recipe is sure to be a hit. Don’t forget to enjoy the process and share your delicious creation with friends and family!

Key Lime Coconut Cake
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C) to ensure even baking.
- In a large mixing bowl, beat the eggs with sugar until light and fluffy. Gradually add flour and baking powder, mixing until just combined. Fold in lime juice.
- Divide batter between greased cake pans and bake for 25-30 minutes until a toothpick comes out clean. Allow to cool in pans for 10 minutes.
- Prepare the soaking syrup by dissolving sugar in warm water, then let it cool.
- For the frosting, beat cream cheese and sugar until smooth, then mix in sour cream, lime juice, and zest until creamy.
- Level the cooled cake layers if necessary. Brush one layer with soaking syrup, spread frosting, and sprinkle with coconut. Repeat with the second layer and frost the top and sides.
- Garnish with remaining coconut and chill for at least an hour before serving.
Notes
- Store leftover cake in an airtight container in the fridge for up to 5 days.
- Freeze individual slices for up to 3 months, wrapped well.
- Use fresh lime juice for the best flavor.
