When Do Mattresses At Costco Go On Sale? (Don’t Sleep On This!)

Missing out on a $100 to $400 discount right before a scheduled promotional window is the single biggest frustration for shoppers upgrading their mattress at Costco. Purchasing a high-end hybrid or memory foam mattress at full baseline MSRP days before an official Monthly Savings Book flyer drops creates immediate financial buyer remorse. Understanding exact historical discount cycles eliminates guesswork and ensures you secure maximum value without compromising on sleep quality or durability.

Our deal analysis team continuously monitors monthly Costco Savings Books, direct warehouse instant rebate schedules, historical SKU price changes, and manufacturer promotional press releases across 12 consecutive promotional cycles. We cross-reference past flyer distribution dates with in-warehouse price tag updates to establish verified target price benchmarks. This guide provides an exhaustive breakdown of when to buy, how much to pay, and how to navigate Costco storefront policies to secure the lowest documented price.

At-a-Glance Deal Calendar & Target Savings

The Promotional Discount Cycle & Refresh Patterns

Costco operates on a distinct financial model compared to traditional mattress retail chains. Standard mattress stores rely on inflated retail markups of 200% to 400%, allowing them to advertise perpetual “70% off” sales. Costco caps its gross margins at approximately 14% for brand name merchandise and 15% for private label Kirkland Signature items. Consequently, discounts at Costco represent genuine reductions below standard wholesale baseline prices rather than manufactured marketing discounts.

Promotional reductions at Costco take 2 primary structural forms: Instant Savings (funded jointly by Costco and the manufacturer) and direct warehouse inventory markdowns. Instant Savings appear in the official Monthly Savings Book, running for 3 to 4 weeks at a time. Direct warehouse markdowns occur when a specific SKU is being phased out or cleared to make room for updated model iterations. These clear-outs are identified by price tags ending in .97 or designated with an asterisk in the upper right corner.

Major Promotional Windows

1. National Holiday Sales (May, September, November): The mattress industry runs on patriotic holiday sales calendar cycles. Costco aligns its heaviest promotional push with Memorial Day in May, Labor Day in September, and Cyber Week in November. During these periods, high-tier models like the Kirkland Signature by Stearns & Foster or Tempur-Pedic sets see price drops ranging from $200 to $500 off standard U.S. list prices.
2. January White Sale & Clearance: January represents a prime buying window for budget-conscious shoppers. Following the holiday season, Costco targets home refresh purchases by discounting bed-in-a-box foam mattresses like Novaform and Casper Select by $80 to $200.
3. Monthly Savings Book Cycles: Outside major holidays, Costco rotates mattress brands through its 3-to-4-week savings flyers. A specific brand (such as Sealy or Leesa) will typically feature in a promotional book 2 to 3 times per year.
4. Non-Promotional Dry Spells: Periods between mid-March to mid-April and mid-October to early November represent non-promotional dry spells. Instant savings on mattresses during these gaps are rare, meaning buyers pay full baseline MSRP.

In-Warehouse vs. Online Price Dynamics

A critical factor in timing a Costco mattress purchase is understanding the price differential between Costco.com and physical warehouse locations. Prices listed on Costco.com almost always include shipping and handling charges, as well as white-glove setup and haul-away services for heavy innerspring or hybrid models.

As a result, in-warehouse cash-and-carry prices are typically $50 to $150 lower than the corresponding Costco.com price for identical mattresses. For compressed foam models like the Novaform 14″ ComfortGrande, purchasing in-warehouse during an active Instant Savings event delivers the absolute lowest documented historical price point.

Novaform 14″ ComfortGrande Memory Foam: Target Price & Best Sale Window

The Novaform 14″ ComfortGrande Gel Memory Foam mattress is Costco’s flagship private-label budget memory foam model. Manufactured by Innocor/FXI in the USA, this 3-layer mattress features a 3-inch layer of EVENCOR GelPlus memory foam, a 3-inch zone of premium support foam, and an 8-inch durable base foam layer. It consistently represents the highest comfort-to-cost ratio in the entire warehouse lineup.

Standard U.S. list pricing sits at $499.99 for a Queen size in-warehouse, and $599.99 on Costco.com (which includes doorstep FedEx delivery). Historically documented promotional discounts drop this model by $100.00, placing the target buy price at $399.99 in-warehouse or $499.99 online. This discount appears consistently during the January White Sale, May Memorial Day, and August Back-to-School/Labor Day promotional cycles.

Costco’s 100% satisfaction guarantee applies fully to Novaform products, allowing members to return the mattress for a full refund if performance degrades over time. If you purchase this model at full price and an Instant Savings flyer drops within 30 days, Costco Customer Service will process a $100.00 price adjustment upon presentation of your original receipt.

Kirkland Signature by Stearns & Foster Lakeridge 14.5″: Target Price & Best Sale Window

The Kirkland Signature by Stearns & Foster Lakeridge 14.5″ Mattress represents the top-tier traditional innerspring offering at Costco. Built by Tempur-Sealy, it engineered high-end luxury features—including IntelliCoil dual-stage innerspring coils, PrecisionEdge high-density border support, and a Tencel moisture-wicking cover—into a package priced thousands below equivalent retail Stearns & Foster models.

Standard U.S. list pricing is $1,199.99 for a Queen size in-warehouse and $1,299.99 on Costco.com. Observed promotional discounts knock $200.00 to $300.00 off this baseline, driving target purchase prices down to $999.99 in-warehouse or $1,099.99 online. Because this is a heavy, uncompressed 14.5-inch mattress, the online price includes full White-Glove delivery, room-of-choice placement, and removal of your old mattress.

Discount timing for the Stearns & Foster Lakeridge is tightly constrained. It rarely appears in standard monthly flyers, reserving its lowest prices for major patriotic holiday events: Memorial Day in May, Labor Day in September, and Cyber Week in November.

Casper Select 12″ Memory Foam: Target Price & Best Sale Window

The Casper Select 12″ Memory Foam mattress is a Costco-exclusive variant tailored from Casper’s original direct-to-consumer design. It features a 4-layer construction including 1.5 inches of breathable polyfoam, 2 inches of Zoned Support memory foam (firmer under hips, softer under shoulders), and a durable support base.

Standard U.S. MSRP for a Queen size sits at $649.99 in-warehouse and $699.99 on Costco.com. Verified historical sale events drop the price by $150.00, resulting in a target price of $499.99 in-warehouse or $549.99 online. This model drops to target price during spring promotional events, back-to-school windows, and Cyber Monday sales.

Casper Select mattresses bought through Costco come with standard member return protections. Unlike purchasing direct from Casper (where trials are limited to 100 nights), buying through Costco allows returns at any point under Costco’s satisfaction policy if the memory foam degrades prematurely.

Tempur-Pedic Supreme 11.5″ Medium/Firm: Target Price & Best Sale Window

The Tempur-Pedic Supreme 11.5″ Mattress line (available in Medium or Firm feel) represents the luxury peak of Costco’s online mattress catalog. Built using authentic TEMPUR pressure-relieving material original formulation, it delivers maximum motion isolation and contouring support.

Standard U.S. list price on Costco.com is $1,999.99 for a Queen size mattress. Historical promotional discounts take $400.00 to $500.00 off, bringing the target benchmark down to $1,599.99. When bundled with an Ergo Adjustable Base, total savings frequently reach $600.00 off MSRP during major promotional pushes.

This product is an online-only offering at Costco.com, meaning prices automatically include white-glove delivery, in-home setup, and removal of old bedding. Discounts occur exclusively during high-tier holiday events like Memorial Day, Labor Day, and Black Friday.

Stacking Payment Rewards & Authorized Storefront Savings

Maximizing savings on a Costco mattress requires combining active Instant Savings discounts with secondary store membership rewards and payment card cash back strategies. Implementing these stackable mechanisms effectively reduces your net out-of-pocket spend by an additional 4% to 6%.

1. The 30-Day Costco Price Adjustment Policy

Costco maintains a strict 30-day price adjustment policy. If you purchase a mattress at full price and it goes on sale within 30 days of your purchase date, Costco will refund the difference. For purchases made in a physical warehouse, bring your original receipt to the Membership Desk. For online purchases made at Costco.com, submit an electronic price adjustment request through the online portal.

This policy eliminates the risk of missing a sale. If your current mattress needs immediate replacement, you can purchase immediately and monitor the subsequent Monthly Savings Book for a price adjustment window.

2. Executive Membership 2% Cash Back Balance

Costco Executive Members earn a 2% Annual Reward on qualifying purchases made in-warehouse and online at Costco.com. Qualifying mattress purchases count fully toward this reward balance. On a $1,199.99 Stearns & Foster mattress purchase, the 2% Executive reward yields $24.00 back.

*Strict Store Policy Exclusion:

• Third-party gift card purchases (e.g., buying Uber, Disney, or airline gift cards at Costco) are strictly excluded from earning the Executive 2% Reward. However, physical product categories—including mattresses, bed frames, and bedding—are fully eligible.

3. Credit Card Cashback Stacking

Combining an Executive Membership with a high-yield cash back credit card increases net savings:

• Costco Anywhere Visa Card by Citi: Earns 2% cash back on all purchases made at Costco and Costco.com. When paired with Executive 2% rewards, net cash back reaches 4% on the total purchase price.

• Rotational 5% Cash Back Credit Cards: Certain credit cards offer 5% cash back categories on Wholesale Clubs during specific quarters of the calendar year (subject to spending caps, typically $1,500.00 per quarter). Aligning a mattress purchase with a 5% wholesale club category quarter yields maximum direct savings.

4. Direct-to-Consumer Alternative Evaluation

While Costco offers exceptional value, budget-conscious buyers should evaluate alternative Direct-to-Consumer (DTC) brands when Costco models are not actively on sale:

• Casper / Purple / Nectar / Leesa Direct Storefronts: DTC brands run independent sales cycles, offering 15% to 30% discounts around holiday windows. However, direct purchases often require paying for extended warranty add-ons that Costco includes standard, and returning a mattress directly through a manufacturer can involve multi-week logistics compared to Costco’s immediate warehouse return desk process.

Frequently Asked Questions

Frequently Asked Questions

What is Costco’s official price adjustment window on mattresses?

Costco provides a 30-day price adjustment window from the date of purchase. If the exact mattress model goes on sale in-warehouse or online within 30 days, present your receipt or submit an online request to receive a refund for the price difference.

Do mattress purchases qualify for the Executive 2% Reward?

Yes, mattress purchases qualify fully for the 2% Executive Membership reward when bought in-warehouse or on Costco.com. Note that third-party gift cards purchased at Costco are strictly excluded from earning the 2% reward.

Are online mattress prices at Costco the same as in-warehouse prices?

No, online prices at Costco.com are typically $50 to $150 higher than in-warehouse tags. Online pricing includes shipping, handling, and white-glove setup/removal services for select models, whereas warehouse purchases are self-transported.

What is Costco’s return policy on mattresses?

Costco includes mattresses under its 100% satisfaction guarantee. Members can return a mattress to any physical warehouse location at any time if unsatisfied with its comfort or quality, receiving a full refund to their original payment method.

When are the biggest mattress sales at Costco?

The largest documented discounts occur during Memorial Day (May), Labor Day (September), Black Friday (November), and January Clearance events. Discounts range from $100 to $500 off baseline MSRP during these specific promotional windows.

Does Costco haul away old mattresses when delivering a new one?

Yes, for mattresses purchased on Costco.com that include White-Glove delivery service (such as Stearns & Foster or Tempur-Pedic sets), delivery teams will set up the new bed and remove your old mattress at no additional charge.

Can non-members purchase mattresses on Costco.com during sales?

Non-members can purchase select items on Costco.com, but face a 5% non-member surcharge over listed prices. Non-members cannot access member-only Instant Savings discounts, rendering membership necessary to achieve optimal target prices.

Final Verdict: Is Right Now the Best Time to Buy?

Decision Matrix & Action Plan

If you are shopping during late August 2026, HOLD OFF on buying immediately at baseline MSRP unless your current bed is completely unusable. The major Labor Day Savings Event drops in late August and early September, delivering documented historical instant savings of $100 to $400 across all primary mattress lines.

If you must purchase immediately due to physical sleep pain or an urgent home move, buy directly in-warehouse to save $50 to $150 over online pricing, and ensure you keep your receipt. Monitor the upcoming September Monthly Savings Book flyer. If your purchased model receives an instant rebate within 30 days, present your receipt at the warehouse Membership Desk to execute a 30-day price adjustment refund. By combining active instant rebates, Executive 2% cash back, and strategic timing, you will secure an elite mattress at the absolute lowest documented historical price point.

(This article was written by our staff writer, Richard Nail. Visit our Research & Editorial Team page to learn more.)