Nobody likes to have to deal with it but it can happen. Water expands when it freezes adding a considerable amount of pressure building on plumbing pipes. That pressure can cause a tiny leak at a joint or crack on a length of pipe, unleashing the full flow of water inside your home.
Pipes are most susceptible to freezing when they are located:
Identify and Locate
Shut off the water supply to that section of plumbing.
How to unthaw:
Use a space heater, heat lamp, or hair dryer to thaw the frozen length of pipe. If you are unable to thaw the pipe, unable to locate the frozen pipe, do not feel comfortable thawing a pipe yourself or if a pipe bursts, you should call a plumber or other professional. They will be able to remedy the problem for you.
Tips to help avoid the possibility of frozen pipes: