Short answer: Costco accepts mattress returns at any time under its 100% satisfaction guarantee. There is no fixed trial window, no restocking fee, and no requirement to keep the original packaging. The 90-day rule that often confuses members applies to electronics and major appliances - not mattresses.
That said, three things still trip people up: heavy stains or damage can get a return refused, accessories like toppers and protectors are non-returnable, and the online return flow for a king-size mattress does not behave like a normal Costco.com return. This guide walks through the policy as it actually runs in warehouses and on Costco.com in 2026, including the time-limit edge cases, the pickup process, and what “like-new” means in practice.
The policy in plain English
Costco's published return policy carves out only a few categories with hard time limits: TVs, projectors, major appliances, computers, tablets, smart watches, cameras, drones, and cell phones are capped at 90 days. Diamonds over 1.00 ct, alcohol, cigarettes, gold bullion, and custom items are non-returnable or have separate rules. Mattresses sit in the default bucket: the 100% Satisfaction Guarantee with no posted time limit.
In practice that means a member who finds a mattress too firm after a month, or notices sagging two years in, can return it for a full refund of the purchase price plus any shipping and handling fees. Costco also does not require the box, the law tag, or the original wrapping - the mattress just needs to be reasonably clean and free of damage that would prevent resale or recycling.
What Costco gets right
- No fixed trial window - returns accepted at any time
- Free pickup arranged for large items, no shipping label needed
- Original packaging is not required
- Refund covers the mattress price plus original shipping/handling
- Receipt not required - your membership ID is the system of record
- Household card holders can also return on the primary member's behalf
Where it falls short
- Mattress accessories (toppers, protectors, pillows) are non-returnable
- Heavy stains, pet damage, or odor can get the return refused on inspection
- Repeated long-after-purchase returns can flag your membership
- Online returns for mattresses don't issue an instant label - pickup is arranged via a follow-up email
- Floor models and final-sale mattresses are excluded
- Manufacturer warranty (typically 10 years) is separate - Costco does not honor it directly
How to return a Costco mattress, step by step
If you bought it in-warehouse
- Bring the mattress (or as much of it as you can transport) and your membership card to any Costco warehouse - it does not have to be the one you bought it from.
- Go to the Returns desk, not regular check-out. Tell them which mattress and approximate purchase date; they look it up by your member number.
- If you can’t move the mattress yourself, call your local warehouse first. They can usually arrange a pickup or credit you on the day if a manager approves it.
- Refunds to credit/debit cards take 3-7 business days. Cash or gift-card refunds are immediate at the desk.
If you bought it on Costco.com
- Sign in at Costco.com and open Orders & Returns. Find the mattress order and click Return or Replace Items.
- Pick a reason and submit. For a standard parcel item Costco issues a label within an hour - but for a mattress, you instead receive an email saying “we’ll be in touch” within 1-2 business days.
- A third-party logistics partner contacts you to schedule a pickup window, usually 1-7 days out. You do not need the original box - the courier will move it as-is.
- Once the mattress is picked up and scanned, the refund posts to your original payment method within 3-7 business days.
Total elapsed time, end to end, is normally 1-3 weeks. If you need it gone faster, you can also bring an online-purchased mattress directly into a warehouse for a same-day refund - just bring your membership card and the order confirmation email.
What “like-new” actually means at the returns desk
Costco's policy says mattresses must be in “reasonable” or “like-new” condition, but warehouse staff have wide discretion. From talking to Costco members and reviewing dozens of recent return reports, the rough working line is:
- Accepted: minor surface dust, light wrinkling, no visible body stains, no smoke or pet odor, no major tears.
- Often refused: yellowing body-oil stains, blood or fluid stains, bed-bug evidence, heavy pet odor, large rips or burns.
- Gray area: small spot stains, slight indentation, faint odor - usually accepted, especially if the member is polite and the mattress was bought recently.
If you are worried about a borderline mattress, the safest move is to use a mattress protector from day one. Most refusals trace back to obvious staining that would have been blocked by a $40 protector.
What is not covered
Two categories are explicitly out. Mattress accessories - toppers, pads, protectors, pillows - are sold final because the foam compresses to the buyer’s body and can’t be resold. Custom-order and final-sale mattresses (rare on Costco.com but they exist for some Sealy and Stearns & Foster configurations) are also non-returnable. The product page flags this with a “Final Sale” label and a longer disclaimer at checkout. If the page does not show a final-sale tag, the standard policy applies.
Floor models in warehouses are an edge case: when a warehouse marks down a display mattress to clear it, the receipt typically lists it as “as-is” and the standard return policy is waived. Always check the receipt or the price-tag color before assuming a clearance mattress is returnable.
How long is too long?
There is no published time limit, and members regularly return mattresses 2-5 years after purchase. A 2024 Fox Business piece highlighted a couple who returned a five-year-old mattress for sagging - Costco accepted it. Stories of 7- and 10-year returns also surface on r/Costco.
What does happen, though, is that Costco's internal system flags accounts with multiple high-value, very-late returns. Members report being asked to use the manufacturer warranty instead, or in rare cases having their membership reviewed. The policy is generous; abuse is not invisible. As a rule of thumb, if the mattress is genuinely defective (sagging beyond 1.5", broken springs, foam breakdown), Costco will return it. If it is simply old and you want to upgrade, the manufacturer warranty is the cleaner path.
Costco vs other mattress sellers
Most online mattress brands offer a 100-365 night sleep trial, then nothing. Costco's open-ended policy is a different shape entirely. The table below summarizes each retailer's effective return window; full conditions and fees are in the linked retailer policies.
How Costco's policy compares
Trial windows and return logistics across major mattress sellers (2026).
Trial windows reflect each retailer’s published policy as of May 2026. Costco does not publish a specific number; in practice, returns are accepted indefinitely under the 100% Satisfaction Guarantee.
Costco mattress return FAQ
Can I return a Costco mattress after 5 years?
Yes. Costco's 100% Satisfaction Guarantee has no published time limit on mattresses, and members routinely return mattresses 2-5 years after purchase. The mattress should still be in reasonable condition and the member ID active. For sagging or defects, Costco often points members to the manufacturer warranty first - but they will still process a return if you prefer the refund.
Do I need the original box or packaging?
No. Costco does not require the box, foam wrap, or original packaging for a mattress return. The pickup courier (online orders) or warehouse staff (in-store returns) handles the mattress as-is. Keeping the law tag on is not required either.
Can I return a Costco mattress without a receipt?
Yes. Costco looks up purchases by your member number, so the receipt is not required. Bring your membership card and ID. If the order was placed on Costco.com, the warehouse can also pull it from your online account history.
Will Costco pick up a mattress from my house?
For mattresses bought on Costco.com, yes - a third-party logistics partner schedules a free pickup after you initiate the return online. For warehouse purchases, pickup is at the local warehouse manager's discretion; many will arrange it for elderly members or hardship cases, but it is not guaranteed.
Does the return cover delivery and shipping fees?
Yes. The refund includes the mattress purchase price plus original shipping and handling charges, posted back to the original payment method. There is no restocking fee.
Are mattress toppers and protectors covered?
No. Costco classifies toppers, pads, protectors, and pillows as non-returnable accessories because they cannot be resold once used. Final-sale and custom-order mattresses are also excluded - these are flagged on the product page or receipt.
Will repeated mattress returns get my membership canceled?
Single returns, even years after purchase, are not a problem. But Costco does track high-value, very-late returns at the account level. Members with a pattern of returning multiple expensive items long after purchase may be asked to use the manufacturer warranty or, in rare cases, have their membership reviewed.
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