In climates where the temperature drops below freezing, it is important to insulate any exposed outdoor pipes for either the home or the landscape irrigation system. Forgetting to do this can lead to pipes that can burst and valves that can break due to really cold temperatures. Insulating these pipes can prevent damage to your home and the plumbing systems during the difficult winter season.
Disconnect your garden hose and store in the garage. Then you can get towels and wrap around the faucet to insulate from cold weather. The video from Fusion below also shows some great new foam enclosures specifically designed for this.
If you have exposed pipes as well, you can buy specifically design foam insulation to wrap around the pipes. Here below is another video on pipe insulation from Pex Supply.