Frostop is the name of an American root beer brand and chain of fast food drive-in restaurants.

The restaurants are known for their rotating oversized root beer mugs used as outdoor signage.

A chain of franchise locations was established, with the biggest growth following World War II.

[1][2] The Frostop drive-ins reached their peak in 1958 with locations concentrated mostly in the American midwest and deep south, but found from New York and Florida to California and Washington state.

[3] Frostop brand products—Root Beer, Sarsaparilla, Red Birch Beer, Orange Cream, Black Cherry, and a Vanilla Caramel Cream soda—are still available in supermarkets and convenience stores in Arkansas, California, Colorado, Illinois, Iowa, Idaho, Indiana, Louisiana, Michigan, Minnesota, Mississippi, Missouri, Nebraska, Nevada, Ohio, Oregon, Pennsylvania, Tennessee, Utah, Washington, West Virginia and Wisconsin.