These two pictures are of frost. The top picture shows frost on plants. The bottom picture shows frost on a spruce tree.

Frost forms when the temperature is at least 32 degrees F,  0 degrees C. It is the water vapor in the air that  freezes and you see the icy crystals on plants and trees. You can also see frost on grass, car windows and other things.

When the sun comes out on a frosty morning, the light shines off the frost and it is very bright.