If your hostas are in a pot, just plant the pot in the garden, making sure the rim of the pot is slightly below the surface of the soil.

You can also store your hosta containers in an unheated garage, shed or cold frame. Without any natural rain or snow they may need to be given a light water occasionally. Without moisture to their root system hostas will not survive the winter. If you keep your pots outside, tip them sideways and cover them with mulch. This is to prevent ice build up on top of your pot which during the freeze thaw cycle will cause root and crown rot.