Blueberry Lemon Loaf is a moist cake-like loaf loaded with fresh blueberries and lemon flavor, topped and baked with a crumble topping. Then, the loaf is drizzled with a sweet glaze to make this a perfect breakfast, snack, or dessert. This is a copycat of the viral Costco Blueberry Lemon Loaf and dare I say, even BETTER! If you would like to try it without added lemon flavor, I also have a delicious Blueberry Bread you will love!

Loaf of Blueberry Lemon Bread Close up on a Cutting Board with Pieces Removed so The Inside Texture is Showing.

Ingredients & Substitutions

Room Temperature Ingredients: Room temperature ingredients (specifically butter, sour cream, egg, and milk) are important here to prevent lumps in this quick bread.

Egg: Out of eggs? Here are a few egg substitutes you could try.

Lemon: You will need one lemon for this recipe. First, zest the lemon until you have 2 teaspoons. Then, juice the lemon for 2 tablespoons of freshly squeezed lemon juice.

Blueberries: Fresh blueberries are best in this recipe. However, you could also use frozen blueberries. Be sure to reserve about 1/4 cup to reserve for the topping before baking the loaf.

Crumble Topping: The crumble topping is easy to make, but really adds something amazing to this blueberry lemon loaf. It’s the topping I added to my Double Blueberry Muffins, which was so perfect, I had to use it again!

Glaze: The simple confectioners’ sugar glaze is made with just two ingredients, confectioners’ sugar (also known as icing sugar or powdered sugar) and water. Add water as needed to get the glaze to your desired consistency. The bread is also delicious without the glaze if you prefer to leave that off.

Loaves of Blueberry Lemon Bread Before Baking with Blueberries on Top and Then Crumble.

Can I Make This Loaf Into Muffins?

Sure! If you prefer blueberry lemon muffins (this is the recipe!), fold all of the blueberries into the batter (without reserving any for the top). Fill 12 lined muffin cups with about 3/4 cup of the batter. Top with crumble and bake for about 20 minutes.

Blueberry Lemon Loaf on a Cutting Board Covered in Glaze Just like Copycat Costco Recipe.

How To Store Blueberry Lemon Loaf

Room Temperature: Wrap the bread in plastic wrap. It will last for up to five days at room temperature.

To Refrigerate: (This is not the recommended method since storing bread in the refrigerator can dry it out faster.) Place in a sealable plastic bag or airtight container and then place into the refrigerator. It should keep for up to 5 days. To reheat, remove from refrigerator and pop a slice into the microwave for 10 seconds or just allow the loaf to come to room temperature naturally, about 15 minutes.

Cut Into Blueberry Lemon Loaf with Glaze and Lemons on Parchment on a Cutting Board.

Can I Freeze Blueberry Lemon Loaf?

Yes! If freezing the loaf, you will want to make sure you allow it to cool completely. Wrap the blueberry lemon loaf tightly with aluminum foil or plastic freezer wrap and place it in a heavy-duty freezer bag. If you prefer not to use foil directly on your bread, wrap it tightly with parchment paper, then place that into a sealable plastic bag. Label it with the date; it will last for two to three months in the freezer. To thaw bread, take it out of the freezer and set it on the counter. Allow it to reach room temperature before you take it out of its packaging; it will re-absorb some of its moisture this way.

More Blueberry Lemon Treats

Cut Into Blueberry Lemon Loaf with Glaze and Lemons on Parchment on a Cutting Board.
5 from 5 votes

Blueberry Lemon Loaf

Prep Time 15 minutes
Cook Time 1 hour 5 minutes
Total Time 1 hour 20 minutes
Blueberry Lemon Loaf is a moist cake-like loaf loaded with fresh blueberries and lemon flavor, topped and baked with a crumble topping. Then, the loaf is drizzled with a sweet glaze to make this a perfect breakfast, snack, or dessert.


Blueberry Lemon Loaf

  • ¾ cup (150 g) granulated sugar
  • ¼ cup (½ stick, 57 g) unsalted butter, room temperature
  • ½ cup (115 g) sour cream, room temperature
  • 1 large egg, room temperature
  • 2 tablespoons fresh lemon juice
  • 2 teaspoons lemon zest
  • 1 ½ cups (187.5 g) all-purpose flour
  • 2 teaspoons baking powder
  • ½ teaspoon kosher salt
  • ½ cup (122.5 g) whole milk, room temperature
  • 2 cups (296 g) fresh blueberries, divided

Crumble Topping


  • 1 cup (125 g) confectioners' sugar
  • 2 tablespoons water, room temperature


Blueberry Lemon Loaf

  • Preheat oven to 375°F. Spray an 8½ x 4½-inch loaf pan with nonstick cooking spray. Set aside.
  • To the bowl of a stand mixer with a paddle attachment, add the sugar, butter, sour cream, egg, lemon juice, and lemon zest. Beat until creamy. (You could also use a handheld mixer.)
  • In a separate bowl, whisk together flour, baking powder, and salt.
  • With the mixer on low, alternate between adding the flour mixture and the milk, beginning and ending with the flour mixture.
  • Gently fold in about 1 ¾ cups of blueberries, reserving ¼ cup for the topping.
  • Pour the batter into the prepared loaf pan and top with the reserved blueberries.

Crumble Topping

  • To make the crumble topping, mix together the flour, granulated sugar, brown sugar, salt, and melted butter in a small bowl.
  • Top the batter with the crumble.
  • Bake the loaf for 65 minutes. The bread is done when an inserted toothpick comes out with a few crumbs, but no wet batter. Let the loaf cool before adding the glaze.


  • In a medium bowl, whisk together the confectioners' sugar and water. Add more water until the glaze reaches your desired consistency.
  • Drizzle the glaze over the cooled loaf. Slice and serve.


Did you make this recipe?

Thank you for making my recipe! You took pictures, right? Well go ahead and post them on Instagram! Be sure to mention me @iambaker and use the hashtag #YouAreBaker.

What the Test Kitchen had to say about this recipe:


Holy cow, this loaf is AMAZING! I have always been a big fan of blueberry and lemon but this one is probably my new favorite. You might be tempted to scale back and use fewer blueberries. Don't, I say! 2 cups is the perfect amount!


This loaf was moist and full of blueberries! I appreciated just a hint of lemon flavor since I am not always a fan of blueberry lemon treats. The crumble topping made this extra amazing!


Lemon and blueberries go so well together, in my opinion. There are sweet and tart flavors. This is a moist loaf with juicy sweet blueberries. Everything about it is incredibly tasty.


If you love the flavors of spring, this is it! Plump, juicy blueberries, in a fantastic lemon flavored loaf with a crunchy crumble on top is out of this world!


Blueberry overload!! If you love blueberries and moist bread, this is it! The hint of lemon and crunchy crumble on top is just perfection.

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Meet Amanda Rettke

Amanda Rettke is the creator of I Am Baker, and the bestselling author of Surprise Inside Cakes: Amazing Cakes for Every Occasion – With a Little Something Extra Inside.Over the course of her 15+ year blogging adventure, she has been featured in and collaborated with the Food Network, New York Times, LA Times, Country Living Magazine, People Magazine, Epicurious, Brides, Romantic Homes, life:beautiful, Publishers Weekly, The Daily Mail, Star Tribune, The Globe and Mail, DailyCandy, YumSugar, The Knot, The Kitchn, and Parade, to name a few.

Reader Comments

  1. I’m going to try this one for sure, I only have frozen blueberries but I have to do it anyways lol, I am going to make my glaze with confectioners and lemon juice instead of water, it will be amazing, I can’t wait .

    1. Loved it! Made it today, didn’t add the topping or glaze, added a little extra zest and it was so good. Will make it again!

  2. DELICIOUS! I followed the recipe exactly as written and turned out amazing. The crumble topping is my favorite part, but the cake is light and fluffy booming with blueberry flavor. This is definitely a keeper.

  3. I want to make this in a bundt cake ! Are there suggestions for that ?

    I know I need 12 cups of batter – that would be about triple this recipe – thnx

  4. Queen of taste tests here. When I saw it was compared to Costco’s lemon blueberry loaf I knew a taste test was in my future! Drumroll please… this recipe won! My family liked the crumb on this loaf better and they liked that it wasn’t as super sweet. Next time I will toss the blueberries with some flour to prevent them from all falling to the bottom. Also 65 mins was just a little too long for my oven. The loaf a was a little darker than I would have liked. And I added lemon oil to my glaze to up the lemon flavor. Next time I may try using lemon juice instead of water for the glaze recipe. It was a delicious treat and I will make it again!

  5. I made this yesterday and I loved it! I squeezed some blackberries in the batter just because I had them and I wanted to be fancy. Has anyone ever squeezed blackberries? Well, I felt like the episode of I Love Lucy when she was making wine with her feet. I would like to say I taste the blackberry flavor but I’m not sure I taste it enough to have stained my hands purple. 10/10 do not recommend that. But anyway, loved this cake. I put vanilla in the glaze but I think next time I’ll save some lemon juice for the glaze. I’ve been up since 5:45 waiting for a decent time to have a slice or three and that’s why I’m here writing this review. Trying to hold back.

  6. With the fresh lemon zest and plump blueberries this recipe tastes just like summer… and boy does it make great muffins too.
    Thank you Amanda. I always look forward to your emails.
    Jupiter, Florida

  7. I have tried a lot of blueberry lemon bread/muffin recipes. And I can honestly say this is the very best of them. I think the reason is the use of sour cream. I have never included that in any recipe I tried. The bread was moist and bursting with blueberry and lemon flavor. I did use a trick you should include: take 2 TBSP of flour from your total amount and toss your blueberries in them before folding them in. It keeps the berries from sinking to the bottom and gives a nice uniformity of them throughout. Also, 1/2 TSP of good quality vanilla made it perfect. Thanks! This is just outstanding.

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