Costco requires guests to wear masks from May 4

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Face Mask Requirements
To protect our members and employees, effective May 4, all Costco members and guests must wear a mask or face covering that covers the mouth and nose at all times while at Costco. This requirement does not apply to children under the age of 2 or to individuals who are unable to wear a mask or face covering due to a medical condition.

The use of a mask or face covering should not be seen as a substitute for social distancing. Please continue to observe rules regarding appropriate distancing while on Costco premises. Thank you for your understanding and cooperation.

https://www.costco.com/covid-updates.html