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The biggest hailstone ever found in the U.S. fell in Vivian, South Dakota, on July 23, 2010: 8 inches across and nearly 2 pounds.

2 sources verified 2 min read
The biggest hailstone ever found in the U.S. fell in Vivian, South Dakota, on July 23, 2010: 8 inches across and nearly 2 pounds.ILLUSTRATION · AI

The largest hailstone ever recorded in the United States fell in Vivian, South Dakota, on July 23, 2010.

The National Climate Extremes Committee verified the stone at 8.0 inches in diameter and 1.9375 pounds (0.879 kilograms), and the National Weather Service measured its circumference at 18.625 inches.

It broke the previous U.S. records for diameter (7.0 inches, Aurora, Nebraska, June 22, 2003) and weight (1.67 pounds, Coffeyville, Kansas, September 3, 1970). The same storm produced winds up to 80 mph and a brief tornado.

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