If you’ve ever grabbed a loaf of Costco blueberry sourdough bread and immediately regretted not buying two, you’re in very good company. That slightly tangy, fruit-studded, chewy loaf is honestly one of their best bakery finds.
I became mildly obsessed with recreating it at home, and after several test batches (tough job, I know), I finally cracked it. This sourdough blueberry bread recipe is the one.
Table of Contents
Why You’ll Love This Blueberry Sourdough Bread
This isn’t your average sandwich loaf. We’re talking a beautifully open crumb, a crackly golden crust, and pockets of sweet blueberries tucked throughout every slice.
The long cold proof gives it deep, complex flavor without being too sour. Add a hint of lemon zest and you’ve basically got a bakery-level blueberry lemon sourdough bread sitting on your counter.
It works as breakfast toast, a snack with butter, or honestly just torn apart and eaten standing over the kitchen sink. No judgment here.
Homemade Costco Blueberry Sourdough Bread
Equipment
- Mixing bowl
- Dutch oven
- Banneton or bowl with towel
- Bench scraper
- Lame or sharp knife
Ingredients
Dough Base
- 500 g bread flour
- 350 g water
- 100 g active sourdough starter
- 10 g salt
Mix-Ins
- 80-120 g dried blueberries
Optional Add-Ins
- 25-40 g sugar optional
- 1 lemon lemon zest optional
Instructions
- Feed your sourdough starter 6 to 8 hours before mixing until active and bubbly.
- Mix bread flour with 300g of water until no dry flour remains. Cover and rest for 30 to 60 minutes.
- Add starter, salt, remaining water, and optional sugar and lemon zest. Mix into a shaggy dough.
- Let dough bulk ferment for 4 to 6 hours. Perform 3 to 4 stretch and folds during the first 2 hours.
- Gently fold in dried blueberries after stretch and folds, distributing evenly without tearing dough.
- Shape into a rough round and let rest for 20 to 30 minutes.
- Shape into final form and place in a floured banneton. Cover and refrigerate for 8 to 16 hours.
- Preheat oven with Dutch oven to 450°F (230°C). Transfer dough onto parchment, score, and bake covered for 20 minutes.
- Remove lid and bake another 20 to 25 minutes until deeply golden. Cool for at least 1 to 2 hours before slicing.
Notes
Ingredients You’ll Need
Here’s everything laid out nice and simple. Using dried blueberries is key here — they won’t turn your dough purple or add unwanted moisture, which is exactly how Costco’s version does it.
| Category | Ingredient | Amount |
|---|---|---|
| Dough Base | Bread flour | 500g (approx. 3 cups) |
| Dough Base | Water | 350g (approx. 1.5 cups) |
| Dough Base | Active sourdough starter | 100g (approx. 1/2 cup) |
| Dough Base | Salt | 10g (approx. 2 tsp) |
| Mix-Ins | Dried blueberries | 80–120g |
| Optional Add-Ins | Sugar | 25–40g |
| Optional Add-Ins | Lemon zest | Zest of 1 lemon |
A quick note on the sugar: it’s optional, but if you want to lean into that sweeter Costco-style flavor, go ahead and add it. Same goes for the lemon zest — it’s the secret weapon for that bright, bakery-style finish in a blueberry lemon sourdough bread.
How to Make Costco Blueberry Sourdough Bread
Don’t be intimidated — sourdough is mostly about patience, not skill. Follow these steps and you’ll be golden (literally).
Step 1 — Wake Up Your Starter
Feed your sourdough starter 6 to 8 hours before you plan to mix your dough. You want it active, bubbly, and at its peak. A sluggish starter means a sluggish loaf, and nobody wants that.
Not sure if your starter is ready? Drop a small spoonful in water — if it floats, you’re good to go.
Step 2 — Autolyse (The Lazy Baker’s Best Friend)
Mix your bread flour with 300g of the water in a large bowl. Stir until no dry flour remains, then cover the bowl and leave it alone for 30 to 60 minutes.
This rest period is called autolyse, and it works wonders for gluten development. You’ll notice the dough feels smoother and more elastic afterward — that’s exactly what you want for great blueberry sourdough bread structure.
Step 3 — Bring It All Together
Add your active starter, salt, sugar (if using), the remaining 50g of water, and lemon zest (if using) to the rested dough. Mix by hand until everything is combined into a shaggy, sticky dough.
It’ll feel messy and a little chaotic — that’s normal. Resist the urge to add more flour. Trust the process.
Step 4 — Bulk Fermentation and Stretch and Folds
Cover the dough and let it bulk ferment at room temperature for 4 to 6 hours. During the first two hours, perform 3 to 4 sets of stretch and folds, spaced 30 minutes apart.
To do a set: grab one side of the dough, stretch it up, and fold it over to the other side. Rotate the bowl and repeat four times. It sounds fancier than it is, promise.
As the hours pass, you’ll notice the dough become pillowy and alive. That’s your sourdough magic happening right there.
Step 5 — Add Those Beautiful Blueberries
After your stretch and fold sessions, it’s time for the star of the show. Gently turn the dough out onto a lightly damp surface. Scatter the dried blueberries across the top, then fold the dough over itself to trap them inside.
Be gentle here — you’re not kneading, you’re tucking. The goal is evenly distributed blueberries without tearing the dough structure you’ve worked hard to build.
“The blueberries will resist a little. Just keep folding gently and they’ll find their place.”
Step 6 — Preshape and Bench Rest
Turn the dough onto a lightly floured surface and shape it into a rough round or oval. Let it rest uncovered for 20 to 30 minutes. This bench rest relaxes the gluten so you can give it a proper final shape without it springing back.
Step 7 — Final Shape and Cold Proof
Shape your dough into its final form — a round boule or an oval batard both work beautifully. Place it seam-side up in a well-floured banneton or a bowl lined with a floured tea towel.
Cover it loosely and pop it in the refrigerator for 8 to 16 hours. This cold proof is what gives your homemade blueberry sourdough that deep flavor and beautiful, open crumb. Overnight works perfectly.
Step 8 — Preheat Hard, Bake Hot
Place your Dutch oven in the oven and preheat everything together to 450°F (230°C) for at least 30 minutes. You want that pot screaming hot before the dough goes in.
Flip your cold dough onto parchment paper, score the top with a sharp blade or lame, and carefully lower it into the Dutch oven. Bake covered for 20 minutes, then remove the lid and bake another 20 to 25 minutes until the crust is deeply golden and sounds hollow when tapped.
Step 9 — The Hardest Part: Waiting
Transfer the loaf to a wire rack and let it cool for at least 1 to 2 hours before slicing. Cutting into it too early releases all that steam and gums up the crumb.
I know it’s torture. Light a candle, do a puzzle, do anything. It’s worth it.
Expert Tips, Variations, and Troubleshooting
Tips for the Best Results
Use dried blueberries only. Fresh or frozen blueberries release moisture that can make the dough slack and the crumb gummy. Dried is how Costco does it, and it’s the right call for this recipe.
Want a milder sour flavor? Shorten the bulk fermentation slightly — around 4 hours at room temperature works well if you prefer a gentler tang, more like the Costco blueberry sourdough bread profile.
Score deeply and confidently. A shallow score won’t give you that dramatic open bloom on top. One assertive slash at a 45-degree angle does the trick.
Fun Variations to Try
If you love the lemon angle, double down on the zest or add a small squeeze of fresh lemon juice to the dough. Your blueberry lemon sourdough bread will have a gorgeous brightness that pairs perfectly with a smear of cream cheese.
You can also swap some of the dried blueberries for dried cranberries or cherries for a fun twist. Same technique, totally different vibe — and just as delicious alongside these soft lemon raspberry cookies for a fruity spread.
Troubleshooting Common Issues
Dough too sticky to handle? Wet your hands instead of adding more flour. A little water on your palms goes a long way and keeps the hydration balanced.
Bread not rising well? Your starter might not have been active enough. Make sure it doubles within 4 to 8 hours of feeding before using it in any sourdough blueberry bread recipe.
Crust not crispy? After removing the Dutch oven lid, leave the oven door slightly ajar for the last 5 minutes of baking. This lets steam escape and gives you that crackly finish.
Storage Instructions
Here’s how to keep your loaf fresh and delicious for as long as possible. Spoiler: it won’t last long.
| Method | Duration | Notes |
|---|---|---|
| Room temperature (cut side down) | 2–3 days | Wrap in a clean towel or beeswax wrap |
| Bread box | Up to 4 days | Keeps crust crispier than plastic |
| Freezer (sliced) | Up to 3 months | Freeze in portions, toast straight from frozen |
Reheating and No-Waste Ideas
To revive a day-old slice, pop it in a toaster or a 350°F oven for 5 to 8 minutes. The crust comes right back to life. For a full loaf refresh, wrap it in foil and warm at 325°F for about 15 minutes.
Got a few stale slices? Cube them up and turn them into a sweet bread pudding or blueberry-studded French toast bake. Honestly, day-old sourdough blueberry bread might be even better in those applications than fresh.
Speaking of creative leftovers, if you love making the most of every ingredient, you’ll enjoy this clever egg white wrap lasagna — another recipe that proves simple ingredients can do big things.
What to Serve With Blueberry Sourdough Bread
Honestly, this bread is a meal on its own with good butter. But if you’re building a spread, pair it with something creamy and savory to balance the sweetness of the blueberries.
It’s wonderful alongside a simple whipped ricotta, cream cheese with honey, or even a sharp cheddar. For a full brunch situation, serve it next to a bowl of fresh fruit and these gorgeous homemade strawberry shortcake biscuits for a bakery-at-home moment.
If you’re going savory, a warming soup or a side like this classic chicken Kiev makes this loaf feel like a proper restaurant-worthy dinner.
Costco Blueberry Sourdough Bread FAQs
Can I use frozen blueberries in sourdough bread?
You can, but it comes with trade-offs. Frozen blueberries release a lot of liquid as they thaw, which throws off the dough hydration and can make the crumb dense and gummy.
If you do use them, thaw and thoroughly pat them dry first. For best results — especially if you’re trying to replicate Costco blueberry sourdough bread — stick with dried blueberries.
How do you make blueberry lemon sourdough bread?
It’s exactly this recipe with the optional lemon zest added in — and I’d say it’s worth it every time. The lemon zest goes in during Step 3 along with the starter and salt.
Use the zest of one large lemon for a subtle brightness, or two lemons if you really want that citrus punch. It takes the blueberry lemon sourdough bread to a whole new level.
How do you make blueberry sourdough bread from scratch?
You’re looking at a two-day process: mix and bulk ferment on Day 1, cold proof overnight, then bake on Day 2. The hands-on time is actually pretty short — most of the time is just waiting while the dough does its thing.
This full recipe above walks you through every step of how to make blueberry sourdough bread, from starter prep all the way to cooling. Follow it once and it’ll feel completely natural the second time.
Why does my sourdough blueberry bread turn purple?
That’s almost always from using fresh or frozen blueberries, which bleed their color into the dough. It’s harmless and still tastes great, but the texture can suffer.
Dried blueberries are the fix — they hold their shape, keep their color contained, and give you that clean, speckled crumb you see in the actual Costco loaf.
Can I add blueberries to any sourdough recipe?
Pretty much, yes! The fold-in technique in Step 5 works with most standard sourdough recipes. Just make sure you’re using dried fruit and folding gently to avoid degassing the dough.
If you love baking with fruit, you might also enjoy experimenting with this lemon raspberry cookie recipe — same fruity-citrus energy, much faster bake time.
Give This Loaf a Try
If you’ve been eyeing that Costco blueberry sourdough bread and wishing you could make it yourself — now you absolutely can. This recipe nails that chewy crumb, sweet berry pockets, and just-right tang that makes the original so addictive.
Once you make it, I’d love to hear how it turned out. Drop a comment below and let me know what you thought. Did you add the lemon zest? Go heavy on the blueberries? I want all the details.
And if you share it on Pinterest, please tag it so others can find this recipe too. Nothing better than a homemade sourdough loaf showing up on someone’s feed on a Monday morning.
Happy baking — and don’t skip the cooling time. I’m watching you.
