Dense, buttery pound cake gets a bright lift from key lime juice and zest, and the result is a slice that stays tender for days without losing its tight, velvety crumb. The glaze settles into the Bundt’s ridges and brings just enough sharpness to cut through all that richness, which is exactly why this cake never tastes heavy even though it eats like a classic Southern-style pound cake.
The trick is keeping the batter balanced. Sour cream brings moisture without thinning the structure, and the eggs need to go in one at a time so the butter mixture stays smooth and holds air. Key lime juice adds flavor, but the real personality comes from the zest, which perfumes the whole cake and keeps the citrus taste from going flat.
Below, I’ve included the small things that matter most with a pound cake like this: how to keep the crumb from turning tight, what to watch for during the bake, and the best way to glaze it so the finish looks as good as it tastes.
The glaze was the perfect tangy finish, and the cake stayed moist with that tight pound-cake crumb even on day two. I used a Bundt pan and it released cleanly after the 15-minute cool, which was a lifesaver.
Save this key lime pound cake for when you want a dense, buttery Bundt with a bright citrus glaze that cracks cleanly with every slice.
The Butter-Sugar Base Is Where This Cake Gets Its Lift
With pound cake, the first 5 minutes matter more than people think. Creaming the butter and sugar until it looks pale and almost fluffy traps the air that keeps a dense cake from turning brick-like, and stopping too soon leaves you with a heavier crumb. The batter should look lighter in color and a little billowy before the eggs go in.
The other place people run into trouble is overmixing once the flour is added. This cake is meant to be tight, but not tough. Mix only until the dry streaks disappear, and let the sour cream handle the moisture. If the batter looks curdled after the eggs, it usually just needs another minute of beating before the flour goes in.
What Each Ingredient Is Doing in the Lime Batter
- Butter — This gives the cake its classic pound-cake richness and that fine, meltaway crumb. Use it fully softened, not melted, so it can whip with the sugar and hold air.
- Granulated sugar — Sugar does more than sweeten here; it helps the butter cream properly and gives the crust a little crispness as it bakes. Don’t cut it much or the texture changes fast.
- Eggs — Six eggs give the cake its structure and that dense, custardy middle pound cake is known for. Add them one at a time so the batter stays emulsified instead of looking greasy.
- Sour cream — This is the moisture insurance. It keeps the crumb soft for days and adds a little tang that works beautifully with the lime.
- Fresh key lime juice and zest — The zest carries the strongest lime flavor, while the juice gives the glaze and batter their sharp, clean edge. Bottled juice won’t taste wrong, but it won’t have the same bright perfume.
- All-purpose flour — It gives the cake enough strength to stand up in a Bundt pan without becoming chewy. Spoon and level it so you don’t pack in too much.
- Powdered sugar for the glaze — This dissolves into a smooth drizzle that sets on the cake instead of sinking in. Whisk it with just enough juice to pour slowly.
How to Build the Batter So the Crumb Stays Tight and Tender
Creaming the Butter and Sugar
Beat the butter and sugar until the mixture looks pale, fluffy, and a little increased in volume, about 5 minutes with a stand mixer. That step sets up the cake’s texture, so don’t rush it. If the mixture still looks grainy and dense, keep going until it loosens.
Adding the Eggs One at a Time
Drop in one egg and let it disappear before adding the next. The batter may look a little broken for a moment, but it should come back together as you keep mixing. If you dump them all in at once, the emulsion can split and the cake bakes up unevenly.
Alternating Dry Ingredients and Sour Cream
Add the flour mixture and sour cream in three additions, starting and ending with flour. That keeps the batter stable and prevents the sour cream from overwhelming the butter base. Stop mixing as soon as the last streak of flour disappears; overmixing at this point makes the crumb tight and dry.
Finishing with Key Lime Juice, Zest, and Vanilla
Stir in the key lime juice, zest, and vanilla at the end so their flavor stays bright. The batter will smell vivid at this stage, almost sharp and buttery at the same time. If the batter seems looser after the juice goes in, that’s normal.
Baking and Releasing the Bundt
Pour the batter into a well-greased and floured Bundt pan and bake until a toothpick comes out clean and the top springs back lightly, usually 60 to 70 minutes. The cake should pull slightly from the sides and smell deeply buttery with a lime edge. Cool it in the pan for 15 minutes only; any longer and it can stick, but turning it out too soon can make it tear.
Glazing After the Cake Is Completely Cool
Whisk the powdered sugar, key lime juice, and zest until smooth, then drizzle it over a fully cooled cake. If the cake is even slightly warm, the glaze melts and disappears instead of sitting on top in that pretty crackled layer. Let it set before slicing so the glaze doesn’t drag across the knife.
Three Ways to Adjust This Cake Without Losing the Good Part
Regular Lime Instead of Key Lime
If key limes aren’t available, use fresh regular lime juice and zest in the same amounts. The cake will still be bright and tangy, but the flavor reads a little cleaner and less floral than key lime.
Dairy-Free Version
Swap the butter for a high-quality plant-based baking stick and use a thick dairy-free yogurt in place of the sour cream. The cake will still hold together, though the crumb won’t be quite as rich or velvety as the original.
Glaze It Less Sweet
Use a thinner glaze by adding the lime juice a teaspoon at a time until it pours like heavy cream. You’ll get a sharper citrus finish and less of the thick sugary shell on top.
Storage and Reheating
- Refrigerator: Keep covered for up to 5 days. The crumb stays moist, though the glaze softens a little on the surface.
- Freezer: Freeze the unglazed cake tightly wrapped for up to 2 months. Add the glaze after thawing so it looks fresh and doesn’t turn sticky.
- Reheating: Warm individual slices for about 10 seconds in the microwave if you want the butter flavor to open up again. Don’t overheat it or the glaze can melt into the cake and lose its clean finish.
Questions I Get Asked About This Recipe
Key Lime Pound Cake
Ingredients
Equipment
Method
- Preheat oven to 325°F and grease and flour a Bundt pan, leaving no dry spots. Set the pan aside while you mix.
- Beat butter and granulated sugar until very light and fluffy, about 5 minutes. Keep mixing until the mixture looks pale and aerated.
- Add eggs one at a time while the mixer runs. Stop and scrape the sides as needed so everything stays evenly incorporated.
- Alternately add the flour mixture (all-purpose flour, baking soda, salt) and sour cream in 3 additions, stirring between each addition. Mix just until the batter looks smooth after the final addition.
- Stir in fresh key lime juice, key lime zest, and vanilla extract until evenly distributed. The batter should smell strongly citrusy with visible zest flecks.
- Pour the batter into the prepared Bundt pan and smooth the top. Bake for 60-70 minutes at 325°F until a toothpick comes out clean.
- Cool the cake in the pan for 15 minutes. Then invert to release and cool completely before glazing.
- Whisk powdered sugar, fresh key lime juice, and key lime zest until smooth. Stop when the glaze flows like a thick drizzle without lumps.
- Drizzle the glaze over the completely cooled cake so it pools into every crack and crevice. Let the glaze set before slicing.