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 employees at a Denver store walked out Monday, expanding a strike that started this weekend. The strike started small with workers at three stores in Estes Park, Fountain and Pueblo, and a Denver distribution center.

They made good on that promise on June 15, joining the first cities to go on strike, including Fountain, Estes Park, and a Denver distribution center. Later in the day, workers from the Littleton Safeway also walked off the job,

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.