Preparing your sprinkler system for winter is one of the most important maintenance steps homeowners in Las Vegas and surrounding areas can take. Flushing your sprinkler system removes water from the lines, helping prevent cracked pipes, broken valves, and costly repairs when temperatures drop.
Below is a simple, SEO-optimized guide explaining how to flush a sprinkler system for winter, when to do it, and when to call a professional.
Even in mild winter climates, leftover water inside irrigation lines can expand during cold nights. This expansion can cause:
Flushing your sprinkler system before winter helps protect your investment and ensures your system is ready to run smoothly when warmer weather returns.
The best time to flush your sprinkler system is before the first hard freeze. In Las Vegas, this is typically late fall to early winter. If nighttime temperatures are consistently dropping below 40°F, it’s time to winterize.
⚠️ Important: Too much air pressure can damage your system. Most residential systems should not exceed 50 PSI.
1. Turn Off the Water Supply
Locate your main irrigation shutoff valve and turn it off completely. This prevents new water from entering the system.
2. Shut Down the Controller
Turn your sprinkler timer to “off” or “rain mode.” Do not leave it set to automatic during winter.
3. Connect the Air Compressor
Attach the air compressor to the system’s blowout port or hose bib. Make sure the connection is secure.
Turn on one sprinkler zone at a time, starting with the zone farthest from the compressor.
5. Blow Out the Lines
Slowly introduce air into the system. Let the sprinklers run until only air or mist comes out—no water.
6. Repeat for All Zones
Turn off the current zone and move to the next one until every zone has been flushed.
7. Remove the Compressor
Once all zones are clear, disconnect the air compressor and leave valves slightly open to relieve pressure.
Drip systems often require special care and can be easily damaged if not flushed correctly.
While some homeowners can flush their own systems, hiring a professional ensures the job is done safely and completely. A licensed irrigation technician can:
At IS Irrigation Services, we provide professional sprinkler system winterization to protect your landscape and prevent expensive repairs. We make sure every zone, valve, and line is properly flushed and ready for winter.