Why You Should Celebrate National Coffee Day For one thing, you can get free joe all over By Newser Editors, Newser Staff Posted Sep 29, 2015 11:27 AM CDT 10 comments Comments (Shutterstsock) (Newser) – Today is National Coffee Day in America, and it's worth celebrating if for no other reason than chains all over the country are offering free cups of joe. Yahoo has a comprehensive list, which includes Dunkin' Donuts (free medium cup), Krispy Kreme (free cup, plus a free doughnut), and Peet's (free cup with breakfast item). Alas, no free cup at Starbucks, but the chain is launching a yearlong project to provide trees to coffee farmers, reports CNNMoney. The chain will donate 70 cents (the cost of a tree) for every bag of coffee bought in the US. Other reasons to partake: While at work: Fortune rounds up a series of studies finding, among other things, that coffee makes you more perceptive and that taking a coffee break with co-workers is a boon for all. Health: Take them with the appropriate grains of salt, but studies have claimed health benefits ranging from cleaner arteries to better vision to a reduced risk of ailments such as melanoma and multiple sclerosis.