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have your own compressor? You can actually do it yourself if you do. Look for some plug or a faucet on the irrigation supply line, close the valve inside the house and if you do have your own compressor get a female hose X fpt adapter, a 3/4 - 1/4 threaded bushing and a type M adapter.

If not just call any of the irrigation companies in the yellow pages for blow outs, usually october is a good time to do it but if you get stuck with an early frost and you are worried about freezing simply shut your water off, open the blowout connection and manually turn a valve on by giving the solinoid a quarter turn. This will drop any of the water in the pipe above ground into the ground, where it is warmer, until you can get it properly blown out. Call for a few quotes as well, pricing varies from company to company and I always say be careful of the guys that aren't in the business but just do it to make a quick buck, some are capable but some should be avoided.

Blowing out tips: Blow your system out at the pressure which it operates, 50 psi is more then adequate.

Blow until your system has little to no mist coming out of the sprinklers, if you have a smaller compressor you may need to cycle through the zones a few times to get it all out. If you have Black poly pipe you don't have to be as diligant as with pvc as it is a little more forgiving.