National Coffee Day is Tuesday, Sept. 29, and national chains as well as local stores in the Philadelphia region are offering free or discounted coffee. Dunkin' Donuts will serve free medium-size hot or iced "dark roast" coffee. One per customer.

Krispy Kreme will offer a free original glazed doughnut and a 12-ounce cup of coffee at participating U.S. locations.

La Colombe, a local coffee roaster, was coy about its plans, saying only there were "surprises" in the works for Tuesday.

Wawa will offer a free, self-serve coffee of up to 24 ounces with a limit of one per customer.

Peet's Coffee & Tea: Get a free small cup of Peet's Major Dickason blend coffee when you make a food purchase-a baked good, oatmeal, or fresh food. This freebie is available at stores in nine states, plus Washington, D.C.

Some supermarkets are offering free or low-cost coffee purchases that benefit a cause or non-profit organization.

Whole Foods is offering 25-cent coffee, Allegro 12-ounce brewed coffee. The Callowhill-based Whole Foods store said its coffee purchases will benefit Community Integrated Services (CIS), a provider of employment to persons with disabilities in the Greater Philadelphia area and Delaware.

The offer lasts until the end of September.

Caribou Coffee isn't doing coffee giveaways on Tuesday, but will donate a cup of java to nurses and families in cancer centers for each cup of Amy's Blend coffee sold.

McDonald's: Some participating McDonald's restaurants are giving out free small coffees, so it's worth calling your local restaurant to check if they're offering a similar deal.

Noticeably absent from the freebies for coffee-drinking addicts? Starbucks.

Starting Tuesday, the chain will donate a coffee tree to farmers for every bag of coffee beans that customers buy from its 7,400 U.S. company-owned locations.

"Many companies are giving away free coffee to celebrate National Coffee Day, but this year Starbucks wants to do something different: to give back, and honor the families and farmers behind your morning cup," said a spokeswoman.

215-854-2808 @erinarvedlund