Currently, unfair labor practice strikes are limited to Safeway/Albertsons locations in just four cities: stores in Estes Park, Fountain and Pueblo, and a distribution center in Denver.

Safeway workers are striking at the same time as contract negotiations between workers and King Soopers are coming to a head. The union is negotiating with King Soopers and parent Kroger after a strike in February. That strike lasted almost two weeks before a deal was reached to pause the labor action for 100 days. That pause expired last month.

With the clock winding down toward Saturday night's deadline for new contract negotiations, a Colorado union has announced locations where grocery employees are set to walk off the job on Sunday in protest.

The union that represents 7,000 Safeway/Albertsons employees in Colorado terminated its contract extension with the company on Wednesday.

Without a labor agreement in place with Union UFCW Local 7, Estes Park Safeway employees will go on strike on Sunday morning, joining just three other Safeway locations,