CRIPPLE CREEK, Colo. — A frozen ice attraction is closing for the season. Ice Castles announced it will close its location in Cripple Creek on Saturday after an 11-week winter season.

They also use crampons, ice screws and carabiners. The conditions have to be just right: When it’s too warm, the ice grows soft and can separate from the rock wall; when it’s too cold, the ice becomes ...