Quick Answer: Costco Canada runs mattress promotions typically in January, May, and September. A double mattress sale at Costco usually means $75 to $150 off, occasionally bundled with free pillows. A double is 54" x 75" -- the same as a "full" in US stores. Most buyers should consider a queen at $60 to $100 more for significantly more sleeping space.
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A Costco mattress sale sounds like an opportunity. Before you commit, it is worth understanding what "on sale" means in the Costco context, what specifications you are actually getting for the money, and whether the double size you are considering is actually the right choice for your space. The answers are not always what the sale sign implies.
When Costco Runs Mattress Sales in Canada
Costco's promotional cycle is reasonably predictable. Mattresses typically appear in the warehouse flyer at reduced prices during:
Costco Canada Mattress Sale Seasons
- January (post-holiday): Costco often runs January mattress deals as part of a broader home goods promotion. This coincides with when many households reassess large purchases after the holiday season.
- May (spring transition): Spring is traditionally the strongest mattress selling season. Costco typically runs promotions in May to capture this demand.
- September (back-to-school / fall setup): A smaller promotion window, often focused on twin and double sizes as people set up student or new-household bedrooms.
- Black Friday / November: Costco participates in Black Friday but mattress discounts are not always the deepest of the year. The January and May events often produce comparable savings.
For a full walkthrough of the in-warehouse vs online buying experience, see our Costco double mattress Canada guide. These patterns are not guaranteed. Costco's buying team makes decisions based on inventory, manufacturer agreements, and warehouse space. The best approach is to check the current Costco flyer (costco.ca/flyer) and set up email notifications for Costco Canada promotions if timing matters to you.
What a Costco Mattress Sale Actually Means
Understanding Costco's pricing structure helps you evaluate whether a "sale" is a genuine opportunity:
How Costco Mattress Pricing Works
Costco negotiates directly with mattress manufacturers to create warehouse-exclusive models. These models are given custom names that do not appear in the manufacturer's standard retail lineup. This prevents direct price comparison with other retailers. When Costco puts a mattress "on sale," the discount is off Costco's own regular price -- which may already be lower than the manufacturer's suggested retail, or may not be. Without a matching model at another retailer, it is difficult to determine how much of the savings is real versus markup-and-discount. The genuine advantage Costco offers is its return policy and buying volume -- the pricing advantage is less clear-cut than it appears.
Shop This Topic at Mattress Miracle
Popular picks at Mattress Miracle:
- Restonic's ComfortCare Dalton & Albany
- Whitney double-sided bamboo mattress
- Somnia 3.0 neck support pillow
Or shop our mattress collection in our Brantford showroom.
We Don't Carry Sealy -- We Carry This Instead
Mattress Miracle carries Restonic ComfortCare and Sleep In -- not Sealy. If you are shopping during a Costco sale period and want a comparison, see our mattress selection or call 519-770-0001. We match Costco's seasonal timing with our own promotions, so the comparison is often closer than you'd expect.
Sale additions like free pillows or bundled accessories add value but should be evaluated honestly: a set of Costco foam pillows that would cost $30 separately is not the same as a $100 discount on the mattress price itself. Focus on the mattress price and specifications, not the bundle value.
Double vs Queen: The Real Math
This is the most important decision in this article, and it gets overlooked during sale excitement more often than you might think.
Double vs Queen: Size and Price Comparison
- Double (Full): 54" x 75" (137 x 190.5 cm). The "Double" is the Canadian term; Americans call this a "Full." At Costco during a sale, a double might be priced $50 to $100 less than the comparable queen model.
- Queen: 60" x 80" (152 x 203 cm). Six inches wider and five inches longer than a double. For one adult, this difference is meaningful for comfort. For two adults, a double is genuinely tight -- each person has about 27 inches of width, roughly the same as a crib.
- Price gap: At most Costco promotions, the queen costs $75 to $150 more than the comparable double. For most buyers, that $100 is the best money they will spend on sleep quality. The extra six inches of width materially changes the sleeping experience for one person and dramatically changes it for two.
The only situation where a double genuinely makes more sense than a queen is physical room constraint. If your bedroom cannot fit a queen with adequate walk space on both sides (you need about 24 inches between the mattress and wall for comfortable movement), a double is the right call. Otherwise, spend the extra $100.
For a detailed look at all Canadian mattress sizes and room requirements, see our Canadian mattress size guide.
Double Mattress Specs at Costco Canada
Costco carries double mattresses from Novaform, Sealy, and occasionally Beautyrest. What to look for on the spec tag:
Specification Checklist for Costco Double Mattresses
- Total height: 8 to 10 inches for a basic all-foam option, 10 to 12 for better foam or innerspring models. Height alone is not quality -- it indicates how many layers are stacked, not how dense they are.
- Foam density: Look for 1.8 lb/ft3 or higher in comfort and transition layers. Most Costco budget models use 1.5 lb/ft3, which compresses faster over time. This spec may not be on the display tag -- check costco.ca's product page for the model you are considering.
- Coil type (if applicable): Pocketed coils are better for motion isolation and longevity than open coil or bonnell spring systems. If the tag does not specify, ask a Costco floor associate.
- CertiPUR-US certification: Indicates the foam has been tested for harmful chemicals including formaldehyde and VOC emissions. Worth looking for, especially for children's rooms.
- Warranty length: Costco models typically carry 10-year warranties. Read the fine print on body impression thresholds (usually 1.5 inches).
Sale Traps to Avoid
During a Costco mattress sale, a few common mistakes are worth being aware of:
- Buying the wrong size because the double is "on sale": If you need a queen but the double is heavily discounted, do not buy the double to save money. You will be uncomfortable for years, and the mattress will likely be replaced earlier as a result.
- Assuming the sale price represents maximum value: During the same sale period, independent mattress retailers often run comparable promotions. Costco is convenient, but it is not always the lowest price for comparable construction. Get a comparison from a local retailer before committing.
- Buying without a plan for delivery: Costco mattresses are available in-store (you load into your vehicle or arrange delivery) or online (costco.ca, delivered to your door). In-store pickup requires a vehicle that can accommodate the mattress size. A double rolled in a box fits in most SUVs and minivans; a traditional innerspring in a box may not.
Better Timing Strategies for Mattress Buyers
When to Buy a Mattress in Ontario (Not Just During a Costco Sale)
Mattress retailers -- including us at Mattress Miracle -- run their best promotions during the same seasonal windows as Costco: January, May, and around holiday weekends. If you are shopping during a Costco sale period, call your local mattress retailer on the same day and ask what is on promotion. You may find that a Canadian-made double or queen from Sleep In or Restonic is available at a competitive price, with the added benefit that you can test it properly in person. We are at 441 1/2 West Street in Brantford and our team does not work on commission, so you get honest information on what is actually in stock and at what price.
The honest reality about mattress sales: the best time to buy is when you need one. Our double mattress selection at Mattress Miracle is available year-round, with seasonal promotions that align with Costco's sale windows. A $100 savings on a mattress you sleep on for ten years is $10 per year -- less than a dollar a month. Choosing the right mattress matters more than the exact timing.
Frequently Asked Questions
How often does Costco Canada have double mattress sales?
Costco Canada typically runs mattress promotions three to four times per year, with the most significant events in January, May, and around Black Friday. The depth of the discount varies, typically $75 to $150 off regular Costco pricing. These dates are not guaranteed and can shift based on Costco's inventory and promotional planning for a given year.
Is a double mattress the same as a full at Costco?
Yes. "Double" and "Full" describe the same size: 54" x 75" (137 x 190.5 cm). "Double" is the Canadian and British term; "Full" is used in the United States. Costco Canada typically uses "double" in their product listings. See our Canadian mattress size guide for a complete conversion chart.
Can I return a Costco double mattress if I do not like it?
Yes. Costco's return policy covers mattresses under their standard guarantee, and most members report that mattress returns are processed without issue. The practical challenge is arranging a large item return -- for online orders, Costco arranges pickup from your address. The return option is a genuine advantage, but testing in a showroom before purchasing is always more efficient than sleeping on something and returning it weeks later.
Is it worth buying a double instead of a queen to save money during a Costco sale?
In almost all cases, no. The queen costs $75 to $150 more at most promotions, and provides six extra inches of width -- which, spread across ten years of nightly sleep, is an extremely small per-night cost for a meaningful comfort improvement. The only exception is genuine room size constraints. If your room cannot fit a queen with adequate clearance on both sides, buy the double. Otherwise, spend the extra $100 on the queen.
Are there alternatives to Costco for double mattress sales in Brantford?
Yes. Mattress Miracle in Brantford runs promotions on double mattresses during the same seasonal windows as Costco. Our Sleep In Canadian-made doubles and Restonic options are available for in-person testing at 441 1/2 West Street. Call us at 519-770-0001 during any Costco sale period to compare what we have available -- our team does not work on commission and can give you an honest comparison.
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.
Sale Prices vs. Real Value
Costco is a trusted retailer. We respect that. But buying a mattress at Costco is fundamentally different from buying paper towels or rotisserie chicken. Here is what the warehouse model means for mattress shopping:
- No testing environment. Costco mattresses are either sealed in boxes or displayed in a warehouse aisle with fluorescent lighting and concrete floors. You cannot lie on them in your sleeping position for any meaningful amount of time. The Canadian Chiropractic Association recommends spending at least 10 minutes testing a mattress in your preferred sleeping position before purchasing.
- Limited selection. Costco carries 3 to 5 mattress brands at any time. A dedicated sleep shop carries 20 to 40+. More options means a better chance of finding the right fit for your body.
- Returns are generous but wasteful. Costco's return policy is excellent, but returning a mattress means sleeping on something you do not like for weeks, arranging transport back to the warehouse, and starting over. Testing in person avoids this entirely.
Why In-Person Testing Matters
Research published in Sleep Health journal found that subjective comfort during a brief in-person test is the strongest predictor of long-term mattress satisfaction. Statistics Canada reports that back pain is Canada's most common chronic condition, making mattress selection a health decision. The Canadian Chiropractic Association recommends evaluating spinal alignment in your sleeping position, something impossible in a warehouse aisle. At Mattress Miracle, you test every mattress in a quiet showroom, in your natural sleeping position, with staff who can assess your alignment.