| | | |

Costco Bakery Sourdough Bread Review

A large boule loaf of sourdough bread from the Costco Kirkland bakery, sitting on a wood table with a hand for scale.

It stayed fresh for three weeks.

Hot dang. These are heavy loaves! Chonky fellows. The loaves are 2-pounds, but not particularly huge. Just heavy. Super dense loaves. At first I wasn’t sure if my bread had risen all the way, because it seemed like my loaf should be larger for the weight. MAYBE it should be, but it was still perfectly tasty in its current manifestation.

Close-up of scored pattern on top of Costco sourdough bread loaf.

This doesn’t look like mass-produced supermarket bread — it really looks artisanal and rustic. The crust is beautifully browned and scored with a decorative lattice pattern and dusted with some flour.

Plastic bag with tiny holes from the Costco bakery, with sourdough boule loaf inside.

One of the things the Costco bakery has done well is packaging the sourdough in plastic bags that have tiny holes. The holes allow enough air inside to keep the crust crusty. My loaf arrived home looking and feeling like a freshly baked loaf. This is a huge step up from most supermarket bread, which has a flaccid crust from being stored in an airtight plastic bag.

The downside of the holey bag is that the bread needs to be stored in something else if it takes more than a few days to eat it. I put mine in another (unholey) plastic bag at home and stored it in my fridge. This kept the bread from drying out prematurely. More about the shelf-life later.

Loaf of sourdough bread from the Costco bakery, sliced open and sitting on a wooden table.

Surprisingly, the bread is not white. It’s a light tan color. It turns out this is from added dark rye flour. More about the ingredients later. The flavor is tangy, and nutty, with just the right amount of subtle saltiness. I hate it when bread lacks salt and has no flavor.

Close-up of sourdough texture from a Costco Kirkland bakery loaf.

The texture is traditional sourdough crumb, with large air pockets and a chewy, crisp texture. It’s not as fluffy or soft as some sourdough varieties, but it is moist. I reiterate that this is heckin’ dense bread, so one slice is quite filling.

Ingredients in the Kirkland Signature sourdough bread from Costco.

Ingredients in Kirkland Sourdough Boule

Although this isn’t an organic product, I love that Costco is using unbleached flour. Additionally, this bread is leavened with natural sour culture, not just “sourdough flavor,” which I appreciate. The dark rye flour was a surprise, but this is part of the deep nutty flavor of the loaf, and also what is giving it a sort of tan color instead of white. I’m not a fan of the additional “natural flavors” and “yeast” and “yeast extracts,” but this is still a big step up from most supermarket sourdough.

Here are the full ingredients:

  • Unbleached enriched flour (wheat flour, malted barley flour, niacin, reduced iron, thiamin mononitrate, riboflavin, folic acid)
  • Water
  • Sour culture
  • Dark rye flour
  • 2% or less of: wheat semolina, salt, cultured wheat flour, modified wheat starch, yeast extract, yeast, dough conditioners (ascorbic acid, enzymes), natural flavors
Crusty bottom of sourdough loaf from the Costco bakery.

Here’s the crusty bottom of the loaf. Because you like looking at crusty bottoms as much as I do, perhaps.

A slice of Costco bakery sourdough bread in a hand, held vertically in front of a gray background.

Here’s a slice. The boule loaf provides long, narrow slices. I ended up cutting the longest ones (near the center of the loaf) in half, to make sandwiches.

A buttered slice of sourdough bread from the Costco bakery.

The texture is chewy, but soft. The bread actually gets softer towards the center of the loaf. I also found the center to be the most fragrant area — the sour culture smell intensifies as you eat your way into the heart of the loaf.

Close up of a buttered and bitten slice of sourdough bread from the Kirkland Costco bakery.

Like most sourdough, the crust is stiff and…crusty. It has a slightly shiny coating and a bubbly texture.

Here’s another buttery picture, for no reason at all:

Two pieces of sourdough bread topped with butter and salt, from the Costco Kirkland bakery.

Nutrition Facts in the Kirkland Sourdough Boule

Nutrition facts label from the Sourdough boule baked in the Costco bakery.

The nutrition facts label says there are 16 servings, which seems like a low estimate. This bread has a decent amount of protein per serving at 5 grams, and a token 1 gram of fiber. Because there are no added oils, the fat content is negligible. Each serving has a respectable 140 calories.

Costco Kirkland sourdough boule loaf inside a plastic bag.

Price & Shelf-life for Costco’s Sourdough Boule

The current price of ~$7 per loaf is fair for the size and quality. As mentioned above, there are supposed to be 16 servings, so that is 44 cents per serving.

Warning. I’m going to admit something weird here: my sourdough loaf sat in my refrigerator for more than 3 weeks. I know that’s a LONG time to keep the same loaf of bread, but it’s a big loaf, my friends, and I have a hobbit-sized stomach. After three weeks, the loaf was still fresh-tasting and moist. It hadn’t gone stale or become dry. I’m tremendously impressed by this, and a long shelf-life is a hallmark of real sourdough fermentation, so that’s reassuring.

This is a product I’d definitely buy again.


More Reviews of Sourdough You Might Like (or Hate)

Check out these other reviews of sourdough bread I’ve recently written:


Author’s note: I have no affiliation with Costco, and I was not compensated in any way for this review.

Similar Posts