How to winterzie a lawn sprinkler system?

The goal in winterizing irrigation systems is to remove all the water, so that when the temperatures freeze the earth, the pipes will not burst from frozen water (which expands the pipes and bursts them).

Blowing the water out from the system is key, as is turning off the master valve, so that no water can be pumped in. Often the local utility will 'turn off' the meter, too.