Costco Will Require Masks to Shop by Fox 28 Spokane | @ | April 29, 2020 9:32 am TwitterFacebookGoogle+LinkedInPinterest 0 Beginning May 4, 2020 all Costco members, shoppers and employees will be required to wear masks at all times. Related Posts Bloomsday is Back! No Whining About Wine Mayor Woodward: Safe Harbor for 300 Afghan’s in Spokane