Guinness World Records lists a snowflake 15 inches in diameter and 8 inches thick as measured at Fort Keogh, Montana, in 1887, as the largest.

How big was the biggest snowflake ever found?

The Biggest Snowflake Ever “Did you know,” the calendar read, “that the largest reported snowflake measured 15 inches (38.1 cm) wide and 8 inches (20.3 cm) thick?! It was discovered by a ranch owner in Fort Keogh, Montana, in 1887.”Dec 7, 2018.

How big can a snowflake get?

There is no routine method for documenting the size of snowflakes in a winter storm, but sometimes they can measure 2 inches across, the National Snow and Ice Data Center says. On rare occasions, snowflakes as large as dinner plates have been observed, according to Kenneth G.