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When does frost form?

Frost is a crystalline deposit of small, thin ice crystals. This deposit forms on objects when the air directly above those objects reaches the frost point. The frost point is the temperature at which a given volume of air becomes saturated and thus can no longer hold water in the vapor state—provided that the air temperature is at or below freezing.

In the formation of frost, a layer of water initially freezes onto the surface. The layer of frost grows as water vapor from the air directly solidifies into ice without going through the liquid phase; this process is called deposition.

Usually frost forms on clear, calm nights, especially during early autumn when the air above the Earth is quite moist. A light frost generally damages only the most tender plants and vines, whereas a heavy frost (a heavy deposit of crystallized water) may kill even hearty (nonwoody) plants.

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