Definition
Within the American Community Survey and Decennial Census, homes set aside for occasional use, less than 9 months out of the year, are considered vacant.
In the American Housing Survey, seasonal units are intended by the owner to be occupied during only certain seasons of the year. They are not anyone's usual residence. A seasonal unit may be used in more than one season; for example, for both summer and winter sports. Published counts of seasonal units also include housing units held for occupancy by migratory farm workers. While not currently intended for year-round use, most seasonal units could be used year-round.
