Hoses and shallow irrigation lines may be damaged over the winter if water
is not drained. If there is a main shut-off valve for the system, close it
and then run through the zones to make sure any pressure has a chance to
bleed off. Lawn irrigation systems usually have shallow lines.
Though some lines may be self-draining, check to be sure there are no manual
drains. If so, they should be opened. Be sure to map them so they can be
closed next spring before the system is pressurized.
Drain hoses by stretching them out and coiling them for storage. Water will
drain as you pull the hose toward you for coiling. Store in a protected
place. UV light can make hoses brittle over time. (Ward Upham)