by Quick answer: Mattresses sold by Costco fall under its 100% Satisfaction Guarantee, with no fixed return window and no restocking fee. Return in-warehouse for an immediate refund, or start an online return for free freight pickup. The manufacturer's warranty still covers later defects.
By the MattressNut editorial team · Updated June 2026
Costco's Mattress Returns & Warranty Explained
A mattress sold directly by Costco — warehouse or Costco.com — is covered by the member 100% Satisfaction Guarantee, and the brand on the bed doesn't change that. Per Costco's stated policy there's no published time limit on mattress returns, and members report returning beds months or years later. Separately, each mattress still carries its own manufacturer's warranty for defects like sagging or broken springs.
One distinction: items like major appliances and electronics have a 90-day limit, but mattresses are not on that list.
Key Terms (what we could verify)
| Item | Detail |
|---|---|
| Warranty length | Manufacturer's warranty (varies by brand) on top of Costco's return guarantee |
| Trial / return window | No fixed limit under the 100% Satisfaction Guarantee (used responsibly) |
| Who pays return shipping | Costco — free freight pickup on Costco.com orders; in-warehouse you bring it back |
| Restocking fee | None stated ($0) |
| How to start | Returns desk at any warehouse, or your Costco.com account for online orders |
How to File / What to Do (step by step)
For a warehouse purchase, bring the mattress (even unboxed and slept on) to the returns desk with your membership card for a refund — purchases are looked up by member number, so the receipt isn't strictly required. No original packaging needed.
For a Costco.com purchase, you can either bring it to a warehouse or start the return in your online account; Costco arranges a free freight pickup from your home. Refunds go to the original payment method (or a Costco Shop Card if that's not possible). For an older mattress with a genuine defect, Costco may direct you to the manufacturer's warranty instead.
Common Problems Owners Report
The policy is generous but conditional in practice. Costco expects returns to be in sanitary, presentable condition — heavy staining or abuse can be refused. Members also report that serial returns can trigger an account review, since the guarantee is meant as a safety net, not a free upgrade path. And third-party marketplace mattresses follow that seller's policy, not Costco's — check who the seller is before you buy.
The Saatva Comparison
Costco's no-limit return is hard to beat, but you're buying whatever brands Costco stocks and leaning on the maker's warranty for long-term defects. If you'd rather buy direct from a brand with a clean lifetime warranty and 365-night trial, Saatva is the cross-shop — lifetime "Friends for Life" coverage, free white-glove delivery, and a flat $99 return in the trial.
See the Saatva Classic warranty & trial
Bottom Line
For a Costco-sold mattress, the return guarantee is the easiest path for comfort issues and the manufacturer's warranty handles later defects. Keep it clean, use the policy in good faith, and confirm current details at the membership desk or on Costco's official return page.
Bottom line: No time limit, no restocking fee, free online pickup — Costco's guarantee is the most forgiving in mass retail, as long as you don't abuse it.
Related: our full Saatva mattress review.