Halloween brought over 6 inches of snow to the Twin Cities, just as trick-or-treating began—a rare event that’s only happened seven times on record.

While the first measurable snow typically falls in early November, Halloween occasionally gets a frosty twist. The most infamous was the 1991 Halloween Blizzard, which dumped 8.2 inches on Halloween day and a staggering 28 inches over three days, marking the most significant snowfall in Twin Cities history.

Though rare, snow on Halloween isn’t unheard of. In fact, last year brought measurable snow, making it the second-snowiest Halloween on record. Though rain is actually more common, recorded nearly 30 times, snow adds a chillier challenge to trick-or-treating—but it might be preferable to a soggy Halloween night.

The Great Lakes region isn’t the only area that can see snow this time of year. Check out our article by Weather & Radar meteorologist Mary Mays, where she explores which parts of the U.S. have the highest chances for a snowy Halloween.