Yes, for those sprinklers that have an above ground backflow, the sprinkler system must be turned off and drained. You need to go to your water meter and look for the cirular green box that is right beside your water meter. Inside there will be a valve that you should turn 1/2 turn. This turns the water to your sprinkler system off. Then you should go to your backflow and turn both the "test cocks" with a screw driver. These cocks stick out of the side of the backflow and require a flat head screw driver. After you have opened both of these, go to your sprinkler system and turn the timer to run 1 manual cycle.
While this is adequate for most winters, a hard winter will still freeze your system. For this reason we recommend you run compressed air thru the system. You can do this with an air compressor and a 1/4 inch male adaptor. If you can't do this, we recommend you call us and we will winterize your system.
For systems that do not have an above ground backflow, you need to turn the valve off that is right by water meter.
It should be noted that if we do not winterize your sprinkler system, the freeze damage is not covered under warranty.