Kraft Heinz notified Pennsylvania officials that it plans to officially close its Allentown plant by the end of next month.
The food giant last year identified the Lehigh Valley factory as one of seven North American plants that would be closed following Heinz's purchase of Kraft.
The 44-year-old plant produced Grey Poupon mustard, A-1 steak sauce and Keurig coffee. Those operations will be shifted to existing facilities in Illinois, Michigan and Canada.
The closure will impact 341 jobs, according to the filing with Pennsylvania regulators; in total, the seven closings are expected to cut 2,600 jobs, or 14 percent of Kraft Heinz's North American factory workforce, over the next two years.
A Kraft Heinz spokesman told the Pittsburgh Business Times that the company is actively exploring "options for the potential sale of the facility."