Where Does Frost Come from?

Answer

Frost is the solid deposition of water vapor from saturated air. If a solid surface is chilled below the dew point of the surrounding air and the surface itself is colder than freezing, frost will form on the surface.
Reference:
1 Additional Answer
Frost comes from a coating of ice crystals that form into a semi-solid sheet of frozen dew or rain. Frost usually happens when the temperature is cold enough to freeze thin layers of water, but not cold enough to actually snow. Frost is usually seen on grass and windows.
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