Disconnect and drain outdoor hoses
Detaching the hose allows water to drain from the pipe so an overnight freeze doesn't burst the faucet or the pipe it’s connected to.
Insulate pipes or faucets in unheated areas
It's best to wrap all water pipes in unheated areas (such as the garage, attic or crawl space) before temperatures plummet. You can find pipe wrapping materials at any hardware or building supply store.
Consider installing "heat tape" or "heat cable"
Install "heat tape" or similar materials on all exposed water pipe (i.e. exterior pipe, or pipe located where the temperature might drop below freezing). It is relatively easy to install and can be found at your local hardware or building supply store. Be sure that you use only UL-listed products and follow the manufacturer's instructions carefully.
Seal off access doors, air vents, and cracks
Winter winds whistling through overlooked openings can quickly freeze exposed water pipes. DO NOT plug air vents used by your furnace or water heater.