Happy 140th birthday Colorado! To celebrate Dunkin' Donuts is offering a free, limited-edition doughnut.

Credit: Dunkin' Donuts

You'll get the Colorado flag doughnut for free with the purchase of a cold brew coffee, or if you want sans coffee, the doughnut will cost 99 cents each while supplies last. Dunkin' Donuts is an East-coast based chain but has 23 locations in Colorado.

Here are some of the participating locations: