8 Surprising Facts About Costco’s Kirkland Signature Brand

To those of us who live in Seattle, Kirkland is a charming waterfront suburb. I most associate it with a quirky tiki bar that’s now long gone and a friendly kitchen store that repaired my beloved stand mixer.

But to devoted Costco shoppers, the word “Kirkland” means the store’s exclusive private brand, Kirkland Signature.

Many stores have a house brand, but few, it seems, are as ubiquitous as Costco’s. Stroll through one of its warehouse stores, and you’ll see the Kirkland Signature brand’s black, red and white logo on everything from paper towels to vodka.

But what do you know about Costco’s Kirkland Signature brand? Here’s a cartful of facts that may surprise you.

1. It’s been around since 1995

The very first Costco store opened in Seattle in 1983, but Kirkland Signature was created in 1995.

According to the company, its intentions were to create an item of the same or better quality as the leading brand at a lower price. So in the warehouse store, you’ll see a huge mountain of Charmin bath tissue next to a similar mountain of Kirkland Signature’s version.

2. The brand almost had a different name

Kirkland Signature was almost “Seattle Signature.” According to The Kirkland Reporter, the Costco team wanted to use “Seattle Signature” for its private label products but were unable to clear the name of the bigger city for use.

So it opted for “Kirkland Signature,” in honor of the suburb where its flagship warehouse at the time was located.

3. It’s enormous

As of this writing, there were well over 300 Kirkland Signature products available across nearly a dozen categories.

In 2022, it accounted for $50 billion in total sales. Some of the more surprising items to bear the Kirkland Signature name include dress shirts, vacuum sealing bags and even almond milk.

4. It goes on sale

Every month or so, Costco offers discounts that it calls “warehouse savings” on certain items, as we detail in “13 Ways to Squeeze the Most From Your Costco Membership.” These items always include some Kirkland Signature products.

5. You shouldn’t buy these items on Amazon

Costco doesn’t sell its private-label products on Amazon, so when you buy Kirkland Signature products there, you’re buying from a third-party reseller.

As we note in “Never Buy These 10 Things on Amazon,” this means Costco is not able to stand behind this merchandise, which could be counterfeit or expired. Also, a 2019 Quartz analysis also found that Kirkland products tend to be more expensive on Amazon.

6. Many products are certified

Just because the products carry the Kirkland Signature label doesn’t mean they’re of poorer quality than the big brand names. For example, Kirkland Signature gas is certified to meet Top Tier performance standards.

Organic Kirkland Signature foods are certified by the USDA. Most Kirkland Signature dietary supplements bear the USP Verified Mark, indicating that they have met strict testing and evaluation criteria.

And multiple Kirkland Signature paper goods are certified by the Forest Stewardship Council or a similar organization.

7. Some products are made by big brands

Before Costco develops its own version of a product, the company usually gives a major brand-name supplier the chance to make the Kirkland version too.

As we detail in “9 Name Brands Behind Costco’s Generic Products,” Kirkland Signature alkaline batteries are actually made by Duracell, Huggies maker Kimberly-Clark produces Costco’s diapers, and several Kirkland Signature coffee products are custom-roasted by Starbucks.

8. These products are the most popular

Need a nudge as to which Kirkland Signature product to buy? According to Costco, the most popular Kirkland Signature products are bath tissue, dish detergent, facial tissue, Free & Clear laundry detergent, lamb and rice formula dog food, men’s non-iron dress shirts, paper towels, drinking water and vitamins.