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.

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.

Chronic understaffing at Albertsons and Kroger grocery stores has led to a near unanimous vote to strike in about 105 stores in Colorado – including 100% of the workers at the Salida Safeway store.

Pueblo and Pueblo West Safeway workers have joined a United Food and Commercial Workers Local 7 strike seeking better pay, staffing and benefits.