A dayslong holiday strike against Starbucks ended on Tuesday with the largest work stoppage ever carried out by the company's unionized workers, involving strikes at more than 300 stores in dozens of cities nationwide, the union Starbucks Workers United said.

A five-day strike by Starbucks baristas had closed at least 59 stores as of Monday afternoon, according to the union organizing the workers.

Starbucks workers have expanded their strike to more cities and closed 59 stores across the U.S. as of Monday, the union said amid stalled negotiations.

The Starbucks Workers United strike continues at some locations across the United States on Christmas Eve. Several dozen locations are shut down, while many thousand remain open. The company says they are ready to get back to negotiations.

The chain's hours vary by location, meaning some will be open while others may be closed. The company recommends customers check with their closest location to confirm their specific holiday hours. Customers can also use the store locator function on the Starbucks app or website for information regarding their local Starbucks shop.

Christmas Eve will be the largest ever work stoppage against Starbucks, the baristas union said, affecting Atlanta, New York and other cities. Most locations will not be impacted.

In what the union has dubbed "The Strike Before Christmas," more than 5,000 workers are walking out of 300-plus Starbucks locations nationwide Tuesday.