An assortment from Duck Donuts in East Meadow.

An assortment from Duck Donuts in East Meadow. Credit: Newsday/Marie Elena Martinez

Chains across Long Island are serving up free doughnuts in honor of National Doughnut Day on Friday. Here’s where to get a sweet treat to begin your weekend:

Duck Donuts — The North Carolina-founded company is offering a free classic doughnut in-store at participating locations with no purchase necessary. More info: duckdonuts.com.

Dunkin' — The national doughnut and coffee company is offering a free donut with any beverage purchase. The chain is also collaborating with lifestyle brand Stoney Clover Lane to bring accessories available for purchase at participating locations. More info: news.dunkindonuts.com

Walmart The retailer’s bakery section is giving away one free glazed donut at all locations. More info: walmart.com/shop/national-donut-day

Tim Hortons — Tim Hortons rewards members can receive a free specialty or classic doughnut with purchase of a beverage. More info: timhortons.com

Friday also happens to be National Flip Flop Day, when Tropical Smoothie Cafes give a free 12-ounce Mango Monsoon smoothie to anyone wearing flip-flops coming into a participating store between 2 and 7 p.m.

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