Stores in Colorado Springs, Fort Collins, Greeley and Longmont will hold strike-authorization votes tonight and tomorrow morning.

On Monday, workers at more Safeway stores went on strike, demanding better pay, benefits, and staffing levels. Union leaders told Denver7 the strike will continue to expand until a contract is reached.

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.

The union representing Safeway store employees in Colorado has given the required 72-hour notice that the strike is set to begin one minute before midnight on Sunday.

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,