If you’ve been a Costco member for a long time, you might feel like the more you wander those gigantic aisles, the more questions you have about what makes the warehouse club tick. Because no matter how familiar that rotisserie chicken display appears or how accustomed you are to navigating the Costco checkout, there’s always another little nuance that makes you go, hmmm.
Like, why is nothing sold warm in the Costco bakery section? We know that there are plenty of bakery items made in the warehouse, so why aren’t they showing that off by selling batches of buttery croissants still toasty from the oven? Ahead, I talked to chef and food developer Vivian Villa, who has worked with Costco on their baked goods, to learn more.
The answer is actually a practical one, but it still might surprise you, so keep reading.
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Why aren’t Costco baked goods sold hot?
It all comes down to food safety and delivering a quality product. Villa explains the reasoning, which has to do with the clear plastic trays Costco uses—and the fact that fresh baked goods release steam. “Putting a hot croissant into a plastic tray, it will lose its crisp and get soggy,” Villa says.
Once that moisture gets trapped inside, it creates a perfect environment for mold and bacteria growth. In fact, packaging and storage conditions are two of the biggest contributors to mold growth in bread, according to research published in the journal Fermentation. No thanks!
And trust us, you don’t want a bagel or croissant that’s been sitting around in a hard plastic shell since coming out of the oven, anyway. “Baked goods must be sold cooler so they don’t fall apart in a hot, moist, moldy container,” Villa says.
Does this apply to all baked goods?
Not quite. There is one exception where a Costco baked good can be sold fresh from the oven, and that is certain breads. “Bread can be sold warm if it’s packaged in a paper bag, not a plastic bag,” Villa says. Paper is breathable and allows steam to dissipate into the air rather than form into droplets on the plastic. In other words? “The bread is protected by the paper,” she says.
Other bakery items aren’t warm because they weren’t just baked. There are plenty of items that are produced off-site, shipped frozen and then thawed to put out for sale, like some of Costco’s iconic bar cakes. Of course, if you’ve ever tried to frost a cake before it has cooled completely, you also understand another reason why cakes can’t be sold warm—the frosting would melt or slide right off.
What about other hot foods?
Costco certainly makes plenty of things that are sold piping hot, like Costco’s famous $4.99 rotisserie chickens. What gives? “The chicken has been marinated with salt water, cooked and well past the kill point for bacteria,” Villa says. “Keeping it under a heat lamp will dry it out over time, but its rotisserie [chicken] is pumped with high salt solution to be prepared for this moment.”
She also explains the precautions Costco takes to make sure the chicken is safe for customers to purchase and consume. They keep their chicken at 185 degrees to be super safe, which is actually higher than the required safe-cooking temperature of 160 degrees.
Costco also goes above and beyond in terms of quality, pulling the chicken from shelves earlier than required. “It’s important to have the Costco chickens not sit for longer than two hours,” Villa says. “If it sits for longer than two hours, the chicken will have dried out.” Luckily, the chicken gets purchased a lot, she says. “The heating of the chicken is to entice people to buy and not have to re-heat.”
How can you ensure your Costco baked goods are fresh and stay mold-free?
Costco tries to take care of this for you by not packaging hot-from-the-oven bakery items right away, instead allowing them to cool to an appropriate temperature first. You should follow their lead once you have bakery items at home by storing them in a cool, dry place.
Generally speaking, refrigeration will cause bread to go stale faster. Instead, store it in a paper bag or in a bread box on a counter. Additionally, try to avoid storing it in any kitchen “hot spots” that might be warmer than others (like near the stove or oven). You can even freeze bread for anywhere from six to eight months, according to food safety experts at Kansas State University. They recommend making sure the bread is cooled completely, then wrapping it well before freezing for maximum preservation.
But because Costco’s bakery does such a high volume of business, nothing sits out for long. So you really don’t have to look for the “most fresh” package in the bunch, as everything you see on display has likely been freshly packaged that day. But, if a bag of, say, Kirkland Signature Bagels feels particularly warm, it may have been packaged before the product has had sufficient time to cool. If you see condensation on the bag, maybe choose a different one, and alert an employee to let them know of any concerns.
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Sources:
- Vivian Villa, chef, product developer and innovator behind UnButter; interviewed April 2026
- Kansas State University Extension: “Freezing Baked Goods”
- Fermentation: “Strategies to Extend Bread and GF Bread Shelf-Life”
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