Tomorrow marks the first day of summer. If you haven't already been wearing your swimsuit and flip-flops and showing off your tan lines, tomorrow is your official kick off. Dunkin' Donuts is celebrating the day by giving away free samples of its new frozen lemonade. 

Photo courtesy of Dunkin' Donuts

On Thursday, June 1, head to your local participating Dunkin' Donuts and get a free 3.5 oz sample of the frozen lemonade between 10am and 2pm. If you like what you're tasting, you can buy yourself a full-sized version on the spot. Pair it with a donut for the ultimate celebration.

The new icy drink made its debut last month and comes in two flavors, original lemonade and strawberry, and both are made with real fruit juice. You can get your hands on the frozen lemonade all day, every day throughout the rest of the summer, but start tomorrow by trying it for free.