The new mask policy will apply to employees in Arizona, Colorado, Nevada, Texas and Utah. Employees in California and Oregon can choose to wear a company-provided N95 mask.
The iconic burger joint is "double-doubling" down on its business and opening new restaurants in and around Nashville, its first expansion east of Texas.
San Francisco's only In-N-Out location still hasn't reopened for indoor dining. The restaurant violated public health requirements by allowing customers to enter without showing proof of vaccination.