National Coffee Day: Here's where to get free or discounted coffee

Tuesday is National Coffee Day, and restaurants and chains all over the country are celebrating. See the list below for chains that are offering specials at participating locations.

Dunkin' Donuts: Guests receive a free medium cup of hot Dunkin' Donuts or iced Rainforest Alliance Certified Dark Roast Coffee. DD Perks Rewards Program members can also get a coupon for a free coffee or other Dunkin' Donuts beverage. The coupon is available by email or the Dunkin' Donuts app. Anyone who joins the Perks program on Tuesday will receive four free coffees.

Eight O'Clock: Customer can try 'Coffee Thins' for free by clicking here. 

GetGo: Free coffee of any size with the download of the GetGo app.

Krispy Kreme: Free 12-ounce cup of coffee and free original glazed doughnut.

Pilot Flying J: Guests can get one free 16-ounce cup of coffee per customer with this coupon.

Sheetz: Get one free cup of coffee.

Starbucks: Starbucks is launching 'Starbucks One Bag for Every Tree Commitment.' Any time a customer buys a bag of coffee in a Starbucks store, a tree will be planted in a community that needs one on their behalf.

Tim Hortons: Get any size coffee in regular or dark roast for $1.

Whole Foods: A 12-ounce cup of coffee is available for 25 cents through September.