This National Ice Cream Day, McDonald's will give away free vanilla soft serve.

Anyone with McDonald's mobile app can get a free vanilla cone July 16. But, for one person, the deal could get sweeter — a lifetime sweeter. Anyone who redeems the offer in the app between 2 and 5 p.m. local time will be entered for a chance at free McDonald's soft serve for life, according to a news release. McDonald's stores in Walmarts, gas stations, amusement parks, stadiums, airports, zoos and museums are not participating.

The winner (only one!) will be notified the same day and receive a Golden Arches Cone as recognition, spokesperson Becca Hary said via email, and a McDonald's Arch Card for $312 plus a check for $4,680. The winner must be 13-years-old or older and will be able to get one cone weekly for 50 years. See official rules on the McDonald's website.

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The odds of someone going to the winning location is about 1 in 13,938.

The fast-food chain recently announced its soft serve is made without artificial colors, flavors or preservatives.

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