Frost-covered trees are trees that have a layer of ice crystals forming on their branches and leaves due to low temperatures. This phenomenon occurs when moisture in the air freezes upon contact with the cold surfaces of the trees, creating a beautiful, white coating. The frost can enhance the natural beauty of the trees, making them appear sparkling and delicate. The formation of frost typically happens during the night when temperatures drop, especially in winter months. Frost can affect various types of trees, including deciduous and evergreen species, and is often seen in forests and gardens during cold weather.