If you don't, it'll ice up and burst. Remove your garden hose from the outdoor faucet before the first freeze.
Unless you have a frost-proof spigot (a worthwhile $25 to $50 upgrade), turn off the water supply at the shutoff valve inside the house and open the outdoor spigot to drain water from the line. Leave it this way until the spring thaw.
Frequency: Once a year.
Last updated December 20 2007: 9:44 AM ET