Winterizing Your Irrigation System: A Step-by-Step Guide

Why Irrigation Winterization is Critical

When water freezes in irrigation lines, it expands with tremendous force that cracks pipes, breaks valve housings, and damages sprinkler heads. A single freeze event can cause thousands of dollars in repair costs that proper winterization easily prevents.

When to Winterize Your System

Schedule winterization after your last watering of the season but before the first hard freeze. In our region, late October through early November provides the right window. Waiting too long risks freeze damage; going too early may require rewetting your lawn.

• Monitor weather forecasts for first predicted hard freeze (below 28°F)
• Plan winterization 1-2 weeks before first freeze date
• Shut off water supply to prevent accidental system activation
• Consider system age and any recent repairs when timing winterization

The Professional Blow-Out Process

Professional winterization uses high-volume compressed air (not high-pressure) to evacuate water from every zone. Technicians work systematically through all zones, running air until only mist comes from sprinkler heads—ensuring complete water removal.

"We see emergency service calls every spring from frozen irrigation systems. The repair costs always exceed what proper winterization would have cost."

Controller and Valve Preparation

Set your controller to "rain mode" to preserve programming while preventing operation. For added protection, disconnect the controller power supply during winter. Above-ground valves and backflow preventers need insulation or removal to prevent freeze damage.

Spring Startup Checklist

Before activating your system in spring, slowly restore water pressure, check for leaks at every valve and connection, test each zone manually before returning to automatic operation, and adjust sprinkler heads and coverage patterns as needed.