Spring  is right around the corner, and soon we'll have warm weather, and long lines at our favorite Dairy Queen.To start off the season, Dairy Queen is offering lucky customers free vanilla soft serve cones on Monday, March 16. The company is giving out the small treats to celebrate Dairy Queen's 75th anniversary according to an article in the Huffington Post. According to Barry Westrum, executive vice president of Marketing for Dairy Queen, the celebrations will continue all year long.Treats are always welcome, especially when they're free!