In cold climates, sprinkler systems should be winterized before the first hard freeze by shutting off the water supply, protecting the backflow device, and removing water from pipes, often with compressed air. Water left inside can freeze, expand, and crack pipes, valves, and sprinkler heads.

Many homeowners hire a professional because blowing out lines with compressed air requires the right equipment and pressure settings.

Step 1: Shut Off and Protect

  • Turn off the main water supply to the irrigation system.
  • Set the controller to rain or off mode so valves do not open.
  • Insulate or drain the backflow preventer according to the manufacturer and local rules.
  • Insulate above-ground pipes and valves exposed to cold air.

Step 2: Remove Water From the Lines

Systems are drained using manual drain valves, automatic drains, or compressed air blowouts. Blowouts push air through each zone to clear water. Too much pressure can damage components, and blowing out lines without water flow protection can harm the system, so professionals use appropriately sized compressors and follow manufacturer guidance.

Safety matters too. Compressed air can cause injury, so wear eye protection and never stand over sprinkler heads during a blowout.

Signs Your System Was Damaged Over Winter

When restarting in spring, watch for soggy spots, geysers from broken heads, low pressure in certain zones, or water pooling near valves. A sudden jump in the water bill can also signal a hidden leak.

Repairs are easier when caught early, before lawns are watered heavily during hot weather. Many irrigation companies offer spring startup visits that include checking each zone, adjusting heads, and resetting controllers for the season.

Smart controllers that adjust watering based on weather can also reduce water waste once the system is restarted. Ask your irrigation company whether your area offers rebates for efficient controllers or sensors, since many water utilities run conservation programs.

Step 3: Plan for Spring

In spring, turn water on slowly to avoid pressure surges, check each zone for leaks, and adjust heads. Many areas require annual backflow testing by a certified tester, so check local water utility rules.

Booking early in fall avoids long waits, and Great Listingz irrigation and sprinkler pros can be compared by service area and availability. Booking winterization early in fall helps avoid long waits when the first freeze is forecast.

Beat the Freeze

Winterizing a sprinkler system means shutting off water, protecting the backflow device, and clearing water from the lines with the right equipment. Schedule service before the first hard freeze, restart carefully in spring, and check local backflow testing rules. Great Listingz can help you find irrigation professionals.