Costco's 5 Best Deals On Mattresses From The 2026 4th Of July Sale

Costco is where you go for snacking while you shop, bulk products, and some great deals on things you need and want. And if you're looking for a new mattress, Costco has a number of different options you can snag to potentially make bedtime even more relaxing. Over the years, the cost of a new mattress has continued to rise to a level that makes it hard to justify such a big purchase. However, that's where warehouse stores like Costco make a difference, as they make the bigger purchases feel more affordable. Just in time for the Fourth of July 2026, Costco is running a sale that includes deals on a number of name-brand mattresses. While you need to have a membership to shop and save, it's definitely worth it when you can grab a deal on some of the more expensive household essentials.

Whether you're looking for a memory foam or a pillow-top mattress, Costco has something for everyone. Not only can you save on a Sealy Posturepedic, but there's even a deal on a Kirkland Signature mattress by Stearns & Foster. So if you want to save some money and get a good night's sleep, these are five of the best Fourth of July deals on mattresses to check out at Costco.

If you're thinking of buying a Kirkland Mattress from Costco, this might be the time to do it, while also saving money. Specifically, the Kirkland Signature by Stearns & Foster 14.5-inch Pillow Top Lakeridge Mattress, which has a 4.4-star rating with over 12,000 reviews. You can choose whether you need a Queen, a King, or a California King-size mattress, with the Queens starting at $999 before any discounts. These pillow-top mattresses feature a hybrid interior of coils and memory foam, with a TENCEL Lyocell exterior that helps to pull moisture away from the body for anyone struggling with staying cool at night. Plus, this mattress offers medium firmness, which is perfect for side sleepers. And as one five-star review from Clint M shared, they were "impressed with how comfortable it is, a medium firm that supports us as back and side sleepers. This comfort has held true through our month of ownership." 

If you're looking for a mattress that has over 8,400 five-star reviews and plenty of returning customers who appreciate the firmness and comfort offered by this Kirkland Signature mattress, this deal might be what you're looking for. As part of the Fourth of July sale, you can save up to $400 on this mattress as part of their Costco Direct offer. One thing to consider is that this deal is best suited for someone looking to purchase multiple large items, including mattresses, at the same time.

If you're looking for a highly rated mattress that features cooling technology, the Sealy Posturepedic Pro Omak Valley 13-inch Firm Hybrid Mattress might be the right choice this Fourth of July. This mattress features gel memory foam designed to relieve pressure, plus a layer of coils for stabilization and support, a coil edge, and a cover that keeps you comfortable all night long. The covering on this mattress has technology to keep you feeling cool even on hotter nights. 

As a five-star review from DrewReview shared, "this has the nice soft topper with a firm underside, making it easy for a larger person to turn over. The mattress is also much cooler than my old memory foam mattress." With multiple reviews like this on the Costco website, it does make sense that this mattress has a 4.4-star rating with over 180 reviews. And this particular mattress from Sealy Posturepedic is available in Full, Queen, and King sizes, starting at $929.99 for the Full size. And for the Fourth of July, you can save $250 off your purchase, making this a great deal if you're considering switching to a hybrid mattress.

If you're a side sleeper who is considering a memory foam mattress, Costco has the answer. The warehouse store offers the Casper Cooling Select 12-inch Memory Foam Mattress, available in four sizes starting at $569.99 for their Full, with the King being $849.99. However, just in time for the Fourth of July, you can save $110 off this particular mattress at Costco.

If this deal works for you, you can choose between Full, Queen, King, and California King sizes depending on what best fits your space and lifestyle. This memory foam cooling mattress features a cooling cover to help you "beat the heat," multiple layers, including a support layer and a layer that helps with pressure, and foam that offers enough give and bounce that you won't feel like you're sinking into the material every time you lie down.

Customers who have purchased this mattress have shared that they appreciate how supportive it is, and quite a few have mentioned medical conditions or procedures that make mattress shopping difficult. As one five-star review from Mtiger10 shared, the mattress is a "wonderful combination of soft feel but supportive enough for those of us who have endured back surgery." Considering this mattress has a 4.5-star rating with over 11,900 reviews, it's clear that there are a lot of people loving the sleep they are getting.

Beautyrest mattresses have a long history of being made with premium materials and innovative technology. At Costco, they carry a few different options, including the Beautyrest 12-inch Silver BRS900 Medium-Firm Mattress, which is highly rated with a 4.2-star rating and over 8,400 reviews. This is a more affordable mattress for anyone looking for a quality night's sleep. This particular mattress comes in Queen for $549.99 or King for $649.99. And as part of the Fourth of July deals at Costco, you can save up to $400 as part of the Costco Direct program. It's all about figuring out if you need more than one mattress heading into the summer.

This mattress features lumbar support, a cooling layer, and medium firmness, perfect for anyone looking for a comfortable night's sleep, while still feeling fully supported. There's a "Dualcool cover" and a unique airflow layer that helps to prevent overheating while you're lying in bed. The coils in this mattress are individually wrapped and designed to reduce motion transfer when your partner shifts in their sleep. As a five-star review from Matt shared, "This mattress is a bit [firm], but perfect for a side sleeper in my opinion. I no longer wake up in a sweat and can finally sleep through the night. It doesn't transfer motion at all."

If you need a mattress that keeps you cool and can be a good choice for people who wake up easily, you might want to consider the PurpleRenew 11-inch Gel Grid Mattress. This mattress features a purple grid layer that allows for better air flow as you sleep. There are also multiple foam layers to help add to the overall comfort and support. And the grid layer is a gel material that is meant to help alleviate uncomfortable pressure that might lead to poor sleep. This mattress is more of a medium firmness, which can work well for people looking for a slightly softer sleep surface while still providing plenty of support. In fact, in a review from Danielle, she shared that with this mattress she's "comfortable in every position." And she's likely not alone, as the PurpleRenew has a 4.3-star rating and nearly 1000 reviews.

This mattress is available in either a Queen or a King size. For the Queen, the list price at Costco is $1,199.99; for the King, $1,499.99. But this Fourth of July, you could save up to $400 as part of the Costco Direct program. And since this is definitely one of the more expensive mattress options, it might help to remember that if it doesn't work out for you, there is always the risk-free return policy.