The union last voted on the contract in December.
Workers who have been locked out at their jobs at American Crystal Sugar for more than a year will hold a fifth vote on the company's last contract offer this month.
Gayln Olson is the president of workers' union in Hillsboro. Olson tells The Grand Forks Herald(http://bit.ly/XBUt3H) the workers will vote on the contract on April 13.
The union last voted on the contract in December. At that point, 55 percent of the union workers voted to reject the contact.
About 1,300 American Crystal Sugar workers have been locked out since August 2011 after they rejected the company's contract.