Here's a problem that comes up around this time of year.
Make sure you take your garden hose off of the hose bib... even if you have a "frost free" spigot. The freezing temperatures can still cause them to leak.
Frost-free valves have a built-in siphon which draws the water back up the pipe a few feet into the relative warmth of your home. It seems that if there's a full hose attached, the siphon doesn't make a difference because it's just sucking up more water.
And these spigots are tricky to replace. Depending on the kind of pipe you have, you may even need a plumber.
If you haven't done this yet, it may be too late here in Asheville. If you think your spigot was damaged by the cold, look for a cutoff valve so that you can turn the water off behind the spigot.
Here's where I usually tell you to call me to get this fixed. But you're gonna need a plumber for this one. Fortunately, my wife keeps a "little black book" of good local service providers, including a great plumber. So call us anyway.