Costco Blueberry Sourdough Bread
Okay, real talk — if you’ve ever grabbed a loaf of Costco blueberry sourdough bread and thought, “I wish I could make this myself,” you’re in exactly the right place. This copycat recipe gives you that gorgeous, jammy, fruit-packed loaf with a golden crust and a swirl of cinnamon sugar tucked inside.
I’m not even going to pretend I wasn’t obsessed with the Costco fresh baked bread section. One bite of that blueberry sourdough loaf and I went full mad scientist in my kitchen until I nailed it. No regrets.
Table of Contents
What Makes This Blueberry Sourdough Loaf So Special
This isn’t just bread — it’s a whole vibe. We’re talking a tangy, chewy sourdough base loaded with wild blueberries and ribboned with a buttery cinnamon sugar swirl. It’s basically dessert you can eat for breakfast and feel zero guilt about.
What sets this fruit sourdough bread apart is the slow fermentation. That long overnight rest develops deep, complex flavor you simply can’t rush. The result? A bakery-worthy loaf that makes your whole kitchen smell like a dream.
If you love baking from scratch, you might also enjoy this chocolate covered strawberry bark — another showstopper treat that’s easier than it looks.
Ingredients for Costco Blueberry Sourdough Bread
Here’s everything you’ll need, grouped so it’s easy to shop and prep. Quality matters here — use filtered water if you can, and make sure your starter is nice and bubbly before you start.
| Group | Ingredient | Amount |
|---|---|---|
| Dough | Bubbly, active sourdough starter | 80 grams |
| Dough | Filtered water | 350 grams |
| Dough | Honey | 20 grams |
| Dough | All-purpose flour | 550 grams |
| Dough | Salt | 9 grams |
| Fruit | Frozen wild blueberries | 3/4 cup |
| Cinnamon Sugar Filling | Softened butter | 3 tablespoons |
| Cinnamon Sugar Filling | Sugar | 1/4 cup |
| Cinnamon Sugar Filling | Cinnamon | 1 teaspoon |
| Cinnamon Sugar Filling | Salt | Pinch |
How to Make Costco Blueberry Sourdough Bread Step by Step
Don’t let the steps intimidate you — this is a two-day process, but most of it is hands-off resting time. You’ve got this. Let’s walk through it together.
Day 1 Morning: Feed Your Starter
Start your day by feeding your sourdough starter. You want it active, bubbly, and at its peak — think of it like waking up a very hungry little friend. This usually takes 4 to 6 hours depending on your kitchen temperature.
Day 1 Afternoon: Mix the Dough
Once your starter has peaked, it’s go time. Combine the starter, honey, and filtered water in a large bowl and stir until you get a milky, slightly frothy liquid. Add the flour and salt, then mix until all the flour is absorbed and you have a rough, shaggy dough.
Cover the bowl and let it rest for one full hour. No peeking, no fussing — just let it do its thing. That rest is doing a lot of quiet work.
First Stretch and Fold
After the hour rest, it’s time for your first stretch and fold. Grab the edge of the dough, pull it up, and fold it toward the center. Rotate the bowl and repeat until you’ve worked all the way around and the dough starts to feel smoother and more elastic.
Cover again and let rest for another hour. You’ll start to see it puff up a little — that’s your starter doing its magic.
Adding the Wild Blueberries
This is the fun part. Rinse your frozen wild blueberries under cold water, then pat them dry with a paper towel. This step removes extra moisture that could make your dough too wet later. Add them directly to the dough bowl.
Do another round of stretch and folds, gently working the blueberries into the dough. Some will burst and turn the dough a gorgeous purple-blue color — that’s totally normal and honestly beautiful. Cover and rest for one hour.
Second Blueberry Stretch and Fold
After resting, perform another set of stretch and folds, or try coil folds if you prefer. The dough will feel a bit wetter than usual — that’s from the frozen berries releasing moisture, and it’s completely okay. Keep working it into a smooth ball.
“The dough may be a little more wet than you’re used to, but I promise it will be okay. Keep working it — it comes together beautifully.”
Overnight Fermentation Options
Here’s where you have a choice. You can cover the dough and let it ferment overnight as-is, or you can do one more set of stretch and folds first if the dough still feels quite wet and loose. Both options produce delicious bread.
Personally, I do an extra fold if the dough feels a little shaggy — just call it baker’s intuition. Then I cover it up and let it ferment overnight on the counter.
Day 2: Pre-Shape the Dough
The next morning, turn your dough out onto a lightly floured surface. Pre-shape it into a rough ball by tucking the edges toward the middle, then flipping it over. Use your hands to push the dough away and pull it back, creating tension in the surface. Cover with a tea towel and let rest 20 minutes.
This pre-shape step is less about perfection and more about getting the dough primed for its final shaping. Don’t stress the details here.
Adding the Cinnamon Sugar Swirl
Now for the showstopper moment. Sprinkle flour on top of the rested dough and use your bench scraper to flip it over, gently stretching it into a rough rectangle. Mix your softened butter, sugar, cinnamon, and pinch of salt into a paste.
Dollop the cinnamon sugar mixture evenly across the surface. Fold the top third down toward the center, then fold the bottom third up. Add more dollops of cinnamon sugar paste, then roll the whole thing up from one end like a cozy little spiral.
Create tension by doing that same push-and-pull motion again. The cinnamon sugar is now tucked inside, ready to melt into golden, caramelized pockets as it bakes.
Banneton and Cold Proof
Using your bench scraper, transfer the shaped dough into a lightly floured banneton, seam side up. If the dough feels sticky, stitch it by pinching the sides toward the center — do your best. Imperfect is still beautiful, I promise.
Cover and place in the refrigerator for at least 2 hours, or up to 3 days if you want to bake it later. A longer cold proof actually develops even more of that gorgeous tangy flavor.
Baking Day: The Dutch Oven Method
When you’re ready to bake, preheat your Dutch oven inside the oven at 450°F for at least 20 minutes. That screaming hot Dutch oven is what gives your Costco blueberry sourdough bread that bakery-style crust — don’t skip the preheat.
Turn the cold dough out onto a piece of parchment paper and score the top with a bread lame. Then carefully lower it into your blazing hot Dutch oven, lid on, and bake for 25 minutes.
Remove the lid and bake for another 23 to 25 minutes, depending on how crispy you like your crust. The kitchen will smell absolutely incredible. Then comes the hardest part — let it cool for at least 30 minutes before slicing. The middle needs time to finish setting up.
Serve with a big smear of butter and a drizzle of honey. Life is good.
Expert Tips, Variations, and Troubleshooting
Tips for the Best Blueberry Sourdough Loaf
Use wild blueberries over regular ones if you can find them — they’re smaller, more intensely flavored, and they distribute throughout the dough more evenly. Frozen works great here, and rinsing them before adding is a non-negotiable step.
Your starter should be bubbly and at its peak activity when you mix the dough. If it’s sluggish or hasn’t doubled after feeding, wait longer. A weak starter = dense bread, and nobody wants that.
Fun Variations to Try
Want to switch up the fruit? Raspberries or blackberries work beautifully in this fruit sourdough bread. You can also swap the cinnamon sugar filling for a lemon cream cheese swirl if you’re feeling fancy.
For a heartier version, substitute 100 grams of all-purpose flour with whole wheat flour. It adds a nutty depth that pairs really well with the sweet berries. It’s a small change with a big payoff.
Troubleshooting Common Issues
If your dough is really wet and sticky after adding the blueberries, don’t panic. Just keep doing stretch and folds — the dough will tighten up. You can also pop it in the fridge for 15 minutes between folds to firm it up a bit.
If the bottom of your loaf is browning too fast, slide a second baking sheet underneath your Dutch oven for insulation. If your crust isn’t crackly enough, bake uncovered for the full 25 minutes instead of 23.
Looking for more baking and entertaining ideas? These patriotic pretzel rods are another crowd-pleasing bake worth bookmarking.
Storage Instructions and Reheating Tips
| Storage Method | Duration | Tips |
|---|---|---|
| Room temperature (wrapped in cloth) | Up to 2 days | Wrap in a clean tea towel — avoid plastic, which softens the crust |
| Airtight container or bag | 3 to 4 days | Crust will soften but interior stays moist |
| Freezer (sliced) | Up to 3 months | Freeze individual slices on a tray first, then bag them |
To reheat, pop a slice in a 350°F oven for 8 to 10 minutes, or use a toaster for that fresh-baked crisp. Avoid microwaving if you can — it makes the crust chewy in a not-great way.
No-Waste Kitchen Ideas
Got a slightly stale loaf? Cube it up and make sourdough croutons — bake at 375°F with olive oil and a pinch of salt until golden. Stale blueberry sourdough also makes incredible French toast. Just saying.
You can even blitz leftover slices into breadcrumbs with a hint of cinnamon. Sprinkle them over a fruit crumble topping for an unexpected twist that tastes like you planned it all along.
Nutritional Information (Per Slice, Approx. 1/8 of Loaf)
| Nutrient | Amount |
|---|---|
| Calories | ~280 kcal |
| Carbohydrates | ~52g |
| Protein | ~7g |
| Fat | ~5g |
| Fiber | ~2g |
| Sugar | ~8g |
| Sodium | ~230mg |
These are estimates based on the ingredient list and standard nutrition databases. Actual values will vary depending on your specific ingredients and slice size.
Costco Blueberry Sourdough Bread FAQs
Can I use fresh blueberries instead of frozen?
You can, but frozen wild blueberries actually work better here. They hold their shape during mixing and release just the right amount of juice. Fresh berries tend to burst and bleed too much, making the dough overly wet and harder to shape. If fresh is all you have, chill them first for best results.
Why does my dough feel so sticky after adding the blueberries?
Totally normal! Frozen blueberries release moisture as they thaw into the dough, which makes it wetter than usual. Just keep doing your stretch and folds — the gluten structure will strengthen and bring it back together. Chilling the dough for 15 minutes between folds also helps firm things up.
Can I make this without a Dutch oven?
A Dutch oven gives you the best steam environment for a great crust, but you can improvise. Bake on a preheated cast iron skillet or baking stone, and add a pan of boiling water to the bottom rack of your oven to create steam. The crust won’t be quite as crackling, but the bread will still be delicious.
How long can I cold proof the dough in the fridge?
Anywhere from 2 hours to 3 full days — and honestly, a longer cold proof is a great thing. The extra time deepens the sourdough flavor and makes the dough easier to score before baking. Just pull it straight from the fridge and bake it cold — no need to warm it up first.
Does this recipe taste like the Costco blueberry sourdough bread?
It’s inspired by the Costco blueberry sourdough loaf, but this homemade version has its own personality — slightly tangier, with a more pronounced cinnamon swirl. Since Costco’s Costco fresh baked bread varies by location and season, think of this as your own upgraded, from-scratch version. Most people who try it say it’s even better.
Try It, Love It, Share It
If you’ve made it this far, you’ve got everything you need to pull off an absolutely stunning blueberry sourdough loaf from your own kitchen. No Costco run required.
This Costco blueberry sourdough bread copycat is the kind of recipe that earns serious bragging rights. It looks impressive, smells incredible, and tastes like something you’d pay way too much for at a boutique bakery.
Give it a try this weekend and let me know how it turns out! Drop your results in the comments below — I love hearing how your bakes go. And if you’re proud of that golden crust (you should be), save this recipe to Pinterest so other bread lovers can find it too.
Looking for more fun things to bake and snack on? Check out these red white and blue muddy buddies for a festive sweet treat, or these firecracker hot dogs when you need something savory for your next gathering.
Happy baking — may your crust be crackly and your crumb be perfectly purple.
Costco Blueberry Sourdough Bread
Equipment
- Large mixing bowl
- Dutch oven
- Banneton proofing basket
- Bench scraper
- Bread lame
- Parchment paper
- Kitchen scale
- Tea towel
Ingredients
Dough
- 80 g sourdough starter bubbly and active, at peak
- 350 g filtered water
- 20 g honey
- 550 g all-purpose flour
- 9 g salt
Fruit
- ¾ cup frozen wild blueberries rinsed and patted dry
Cinnamon Sugar Filling
- 3 tbsp butter softened
- ¼ cup sugar
- 1 tsp cinnamon
- 1 pinch salt
Instructions
- In the morning, feed your sourdough starter. Allow it to become bubbly and active, reaching its peak — this typically takes 4 to 6 hours depending on your kitchen temperature.
- In the afternoon, when your starter has peaked, combine the bubbly starter, honey, and filtered water in a large bowl. Stir until a milky liquid forms. Add the flour and salt and mix until all the flour is absorbed and a shaggy dough forms. Cover and let sit for one hour.
- After resting, perform your first stretch and fold. Pull the edges of the dough up and toward the middle, rotating the bowl each time, until a semi-smooth dough ball forms. Cover and let rest for another hour.
- Rinse the frozen wild blueberries with cold water to release extra moisture. Pat dry with a paper towel and add to the dough. Stretch and fold the dough up and toward the middle, rotating the bowl and incorporating the blueberries throughout. Cover and let rest for one hour.
- Perform another set of stretch and folds, or coil folds. The dough may feel wetter than usual — this is normal from the frozen blueberries. Keep working the dough into a smooth ball. Cover and let rest.
- Optional: you can either cover and let your dough ferment overnight as-is, or perform one more set of stretch and folds to strengthen the dough if it feels too wet. Both approaches result in delicious bread.
- The next morning, turn your dough out onto a lightly floured surface. Pre-shape into a ball by tucking the edges toward the middle, flipping it over, and using your hands to push and pull the dough to create tension. Cover with a tea towel and let rest for 20 minutes.
- Sprinkle flour on top of the rested dough and use your bench scraper to flip it over. Lightly stretch the dough into a rectangle shape.
- Mix the softened butter, sugar, cinnamon, and pinch of salt together into a paste. Dollop the cinnamon sugar mixture evenly over the surface of the dough. Fold the top third down toward the middle, then pull the opposite side up toward the middle. Add more dollops of the cinnamon sugar mixture onto the dough.
- Starting from one end of the dough, roll it up so the cinnamon sugar is tucked into the middle. Create tension in the dough by repeating the push and pull motion, just as you did during the pre-shape.
- Using your bench scraper, transfer the shaped dough into a lightly floured banneton, seam side up. Stitch the dough if needed by pinching the sides toward the middle. Cover and place into the refrigerator for at least 2 hours, or up to 3 days.
- When ready to bake, preheat your Dutch oven inside the oven at 450°F for at least 20 minutes.
- Turn your cold dough out onto a piece of parchment paper. Use your bread lame to score the top of the dough. Carefully lower the dough into the hot Dutch oven using the parchment paper. Replace the lid and bake for 25 minutes.
- Remove the lid and bake for an additional 23 to 25 minutes, depending on how crispy you prefer the crust.
- Let the bread cool for at least 30 minutes before slicing to ensure the interior is fully set. Serve with a generous smear of butter and a drizzle of honey.
