CDC relaxed mask rules considerably. You can now stop wearing the mask inside your Costco warehouse ONLY IF your state government allows. For example, in California, a mask is required.

It’s very simple: if the store says “Mask Required”, then the mask is required

Updated May 14, 2021: Visit Costco website for more information regarding Covid

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U.S. locations with no state or local mask requirements – revised policy
In Costco locations where the state or local jurisdiction does not have a mask mandate, we will allow members and guests who are fully vaccinated to enter Costco without a face mask or face shield. We will not require proof of vaccination, but we ask for members’ responsible and respectful cooperation with this revised policy. Face coverings will still be required in healthcare settings, including Pharmacy, Optical, Hearing Aid. Costco continues to recommend that all members and guests, especially those who are at higher risk, wear a mask or shield.

U.S. locations with state or local mask requirements – no policy change
In those Costco locations where the state or local jurisdiction does have a mask mandate, we will follow the state or local regulations and continue to require members and guests to wear a face mask or face shield. Children under the age of 2 are exempt. If a member or guest has a medical condition that prevents them from wearing a mask, they must wear a face shield.