Can 18 year old be put out of house?

If it's your parents' house, yes. Since your now officially an adult, they are no longer your legal guardian and don't have to give you shelter and support. If it's your own house, that YOU paid for and stuff, NO.

Laws vary from state to state. In some states the parents are responsible for you until you turn 19. In some it is until 18 and graduated high school or 19.