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How to start up a sprinkler system in spring

To start up (open) a sprinkler system in spring, wait until the soil is thawed about 12 inches deep. Close the manual drain valves, then open the main water valve slowly so the pipes fill gradually. Opening it fast causes a water hammer that can burst pipes. Then set the controller and run each zone, looking for broken heads, leaks and spray on the pavement.

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How to start up a sprinkler system in spring

Checklist

  • Dig with a shovel: soil should be frost-free 12 inches downBefore start-up
  • Close all manual drain valvesBefore any water goes in
  • Open the main valve slowly and let the system fillStart-up day
  • Set the controller date, time and watering scheduleStart-up day
  • Run each zone; flag broken, tilted or buried headsStart-up day
  • Turn heads away from the driveway, sidewalk and houseStart-up day
  • Check valve boxes and joints for leaksStart-up day, then monthly
  • Ask your water utility whether the backflow preventer needs a yearly testSpring

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Why slow matters

The Lincoln, Mass., water department calls opening the valve slowly the most important step. A fast opening sends a high-pressure surge, or water hammer, through empty pipes. That surge can burst pipes and damage valves.

Open the main valve a little and let the pipes fill. Then open it the rest of the way.

Walk every zone

Most systems run at night, so broken heads go unnoticed. EPA WaterSense suggests a four-step "sprinkler spruce-up": inspect, connect, direct, select. Run each zone and look for heads that don't pop up fully or are tilted.

Check the joints and valve boxes for leaks. Pooling water between cycles can mean an underground leak. Point heads at the lawn, not the pavement. Each head should reach the next one, called head-to-head coverage.

Replace cracked or worn heads and nozzles. If you aren't sure how, an irrigation pro can do it.

Set a sensible schedule

EPA WaterSense says most landscapes need about 1 inch of water a week, including rain. Water early, not in the midday sun. If water runs off, split the run time into shorter cycles with breaks so it soaks in.

Mist or overspray is a sign of too much pressure. A pressure regulator can fix it; check your system manufacturer's range.

What you'll need

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Questions

When should I turn on my sprinkler system in spring?

After the last hard freeze, once the soil is thawed about 12 inches down. If it is still frozen, wait a week and check again.

How fast should I open the sprinkler main valve?

Slowly. Let the pipes fill a little at a time. Opening it fast can cause a water hammer that bursts pipes or damages valves.

How much water does my lawn need?

About 1 inch a week, including rain, per EPA WaterSense. It varies with your climate, soil and grass, so ask your local water utility or Extension office.

Sources

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General guidance for typical homes. Follow your equipment manufacturer's instructions and local codes, and hire a pro for anything you're not comfortable doing.