GILFORD, N.H. (AP) — A costumed skier races down a slope, hits a pond and hydroplanes halfway across. He pirouettes and then plunges into the icy water before jumping up and waving to the cheering crowd.

It’s the wacky spring tradition of pond skimming, and it’s happening this month at ski resorts across the country. It’s often held to celebrate the last day of the skiing season before the chairlifts close until the following winter.

Among the resorts holding pond skimming events this weekend are Snowbasin in Utah and Winter Park in Colorado. Mountains in New England and California have already held events or have them scheduled for later in the month. The tradition dates back decades, made famous by the late filmmaker Warren Miller who began documenting the annual Mt. Baker Slush Cup in Washington state in the 1950s.

These days, most resorts make their own ponds with plastic sheeting and water about 3 feet (1 meter) deep. The idea is that skiers and snowboarders try to gain enough downhill momentum to skim clear across a pond. People ski in pajamas, dressed as movie characters, holding fishing rods or shirtless.