Key lime pound cake — the bright, buttery loaf that tastes like sunshine on a plate

I made this key lime pound cake for the first time completely by accident. I had bought a big bag of key limes for something else entirely, used about a third of them, and then stood in my kitchen wondering what to do with the rest. Pound cake seemed like the obvious answer. What came out of that oven an hour later was so good that I immediately wrote down exactly what I had done so I would never forget it.

Key lime has this quality that very few other flavors have — it is bright and tart and citrusy but also somehow warm and tropical at the same time. It cuts through the richness of a butter-heavy pound cake batter in exactly the right way, so what you end up with is something that is indulgent but never heavy. Dense and moist in the middle, slightly crisp on the edges, and finished with a glaze that is almost aggressively tangy in the best possible way.

This is the cake I bring when I want to impress someone without spending all day in the kitchen. It looks like you tried hard. You did not have to. That is the beauty of a good pound cake recipe :)

Why you'll love this recipe

• That key lime flavor goes all the way through — zest and juice in the batter, more in the glaze, lime zest on top
• Dense and moist with a perfect buttery crumb — everything a pound cake should be
• The glaze is everything — tangy, sweet, and sets into a beautiful drizzle down the sides
• Simple enough for a weeknight, impressive enough for company — it does double duty effortlessly
• Keeps beautifully for days — the flavor actually deepens as it sits
• Freezer-friendly — make one now and stash one away for later

Ingredients with key notes

For the pound cake:

• 1 cup unsalted butter, softened to room temperature — Room temperature butter is non-negotiable for a proper pound cake. It needs to cream to a light, fluffy consistency and cold butter simply will not do that. Pull it out of the fridge at least an hour before you start baking.
• 2 cups granulated sugar — Pound cake is a rich dessert and it needs the full amount of sugar to balance the tartness of the key lime and create that signature dense, moist crumb.
• 4 large eggs, room temperature — Room temperature eggs incorporate more evenly into the batter and help create a smoother, more uniform texture. Cold eggs can cause the batter to curdle slightly.
• 3 cups all-purpose flour — Spoon and level your flour — do not scoop directly from the bag. Over-measured flour is the most common reason pound cakes turn out dry and dense in the wrong way.
• 1/2 teaspoon baking powder — Just enough to give the cake a slight lift without making it too airy.
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt — Balances the sweetness and brightens the lime flavor.
• 1 cup sour cream — This is the secret to an incredibly moist, tender pound cake. The acidity in the sour cream also reacts with the baking soda for a better rise and a finer crumb. Do not substitute with plain yogurt if you can help it — sour cream gives a richer result.
• 1/4 cup fresh key lime juice — Fresh is always better. Key limes are smaller and more aromatic than regular Persian limes with a slightly more complex, floral tartness. If you cannot find key limes, regular lime juice works but the flavor will be slightly less nuanced.
• 2 tablespoons key lime zest — The zest carries the most intense lime flavor and aroma. Add it generously and do not hold back.
• 2 teaspoons vanilla extract — Rounds out the citrus and adds warmth to the overall flavor profile.

For the key lime glaze:

• 2 cups powdered sugar, sifted — Sifting is important here. Lumpy glaze is avoidable and nobody wants it.
• 3 to 4 tablespoons fresh key lime juice — Start with three tablespoons and add more for a thinner, more pourable consistency. The more lime juice you add, the tangier and more vibrant the glaze will be.
• 1 teaspoon key lime zest — Stirred directly into the glaze for little pops of bright lime flavor and color throughout.
• Pinch of salt — Sharpens all the flavors in the glaze beautifully.

For garnish:

• Extra key lime zest — Scattered generously over the wet glaze before it sets so it adheres to the surface.
• Thin lime slices or curls — Optional but they make the presentation look genuinely stunning.

Step-by-step instructions

Step 1: Prep your pan and preheat the oven

Preheat your oven to 325 degrees F. Grease a 9x5 inch loaf pan thoroughly with butter or non-stick spray, then dust it lightly with flour, tapping out any excess. This double preparation is what ensures the cake releases cleanly after baking. Alternatively, line the pan with parchment paper leaving an overhang on the long sides for easy lifting. Set aside.

Step 2: Whisk the dry ingredients

In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside. Having your dry ingredients pre-mixed means you can add them to the batter in one smooth step without overmixing.

Step 3: Cream the butter and sugar

In a large bowl using a hand mixer or stand mixer fitted with the paddle attachment, beat the softened butter and granulated sugar together on medium speed for a full 4 to 5 minutes until the mixture is very light, pale, and fluffy. Do not rush this step. Proper creaming is what gives pound cake its structure and tender crumb. Scrape down the sides of the bowl as needed.

Step 4: Add the eggs

Add the eggs one at a time, beating well on medium speed after each addition and scraping down the sides of the bowl between each egg. The mixture should look smooth and cohesive after each addition. If it looks slightly curdled, do not panic — it will come together once the flour goes in.

Step 5: Add the lime, vanilla, and sour cream

Add the key lime juice, key lime zest, and vanilla extract to the batter and mix on low speed until just combined. Add the sour cream and mix briefly until incorporated. The batter may look slightly curdled at this stage — that is completely normal and will resolve once the flour is added.

Step 6: Add the dry ingredients

Add the flour mixture to the wet batter in three additions, mixing on low speed between each addition until just combined. Do not overmix once the flour goes in — overmixing develops gluten and will make your pound cake tough. Stop mixing as soon as you no longer see dry flour streaks.

Step 7: Bake

Pour the batter into the prepared loaf pan and smooth the top with a spatula. Bake at 325 degrees F for 55 to 65 minutes until a toothpick inserted into the center of the cake comes out clean or with just a few moist crumbs attached. Start checking at the 55-minute mark. If the top is browning too quickly before the center is done, loosely tent the pan with aluminum foil for the remaining baking time.

Step 8: Cool the cake

Remove the cake from the oven and let it cool in the pan on a wire rack for 15 minutes. Then carefully remove it from the pan and transfer it to the wire rack to cool completely before glazing. Glazing a warm cake will cause the glaze to run off completely rather than setting on the surface — give it the time it needs.

Step 9: Make the glaze

While the cake cools, whisk together the sifted powdered sugar, key lime juice, lime zest, and salt in a small bowl until completely smooth. The glaze should be thick but pourable — it should flow slowly off the end of a spoon. Add more lime juice a teaspoon at a time to reach the right consistency.

Step 10: Glaze and garnish

Set the completely cooled cake on a wire rack with a sheet of parchment paper underneath to catch the drips. Pour the glaze slowly and evenly over the top of the cake, letting it drip naturally down the sides. Work from one end to the other for even coverage. Immediately scatter extra key lime zest over the wet glaze so it adheres as the glaze sets. Add thin lime slices or curls if using. Let the glaze set for at least 20 minutes before slicing.

Serving suggestions

• Serve it at room temperature for the best texture and the most vibrant lime flavor
• Pair with a dollop of lightly whipped cream or a small scoop of vanilla ice cream for a proper dessert moment
• Serve with fresh berries on the side — raspberries and blackberries pair beautifully with the bright lime flavor
• Slice and serve alongside a cup of hot tea or iced tea for a perfect afternoon treat
• Serve as a brunch centerpiece on a board with fresh fruit and a dusting of extra powdered sugar
• Toast individual slices lightly in a pan with a little butter for a warm, slightly caramelized version that is completely different and completely delicious

Storage tips

Room temperature: Store the glazed cake loosely covered with plastic wrap or in an airtight container at room temperature for up to 3 days. The flavor actually improves on day two as the lime infuses further into the crumb.

Refrigerator: For longer storage, refrigerate the cake in an airtight container for up to 7 days. Bring slices to room temperature before serving for the best texture — cold pound cake loses some of its softness and moisture.

Freezer: This cake freezes beautifully for up to 3 months. For best results, freeze the unglazed cake — wrap it tightly in plastic wrap followed by a layer of aluminum foil. Thaw at room temperature overnight and glaze fresh before serving. You can also freeze individual slices of glazed cake wrapped in plastic wrap for a grab-and-go treat.

Closing

Key lime pound cake is one of those recipes that has genuine staying power. It is not trendy, it is not complicated, and it does not require any special equipment or hard-to-find ingredients. It is just a really, really good cake that delivers every single time and makes people genuinely happy every time it shows up on the table.

Make it once and you will understand why it earned a permanent spot in my baking rotation. Drop a comment below and let me know how it turned out. And if you tried the cream cheese swirl variation or added your own creative twist, I absolutely want to hear about it.

With gratitude, Kip.