Winterize Your Sprinkler System in Colorado: Complete Guide

Why Winterizing Your Sprinkler System Matters in Colorado

Denver experiences freezing temperatures from October through April, with average winter lows dropping below 30°F. When water remains in your sprinkler lines, it expands as it freezes—a process that can crack pipes, damage valves, and cost thousands in repairs come spring.

Winterizing your sprinkler system is essential maintenance that takes just a few hours and protects your investment year-round.

Step-by-Step Winterization Process

Step 1: Turn Off Your Water Supply

Locate your main water shut-off valve (typically near your meter or where the line enters your home) and turn it clockwise until fully closed. This prevents new water from entering the system.

Step 2: Drain All Water from Lines

Most Denver sprinkler systems have drain valves at low points throughout the system. Open these valves and allow all water to drain completely. This is the most critical step—any remaining water will freeze and expand.

Step 3: Blow Out Your System

Use an air compressor at 80-90 PSI to blow compressed air through all sprinkler lines. This removes any remaining water that draining alone may have missed. Never exceed 90 PSI—higher pressure can damage components.

Step 4: Shut Down Your Controller

Turn off your sprinkler timer or smart controller. Disable any automatic schedules completely to prevent the system from attempting to run during winter.

Step 5: Protect Exposed Components

Insulate any above-ground backflow preventers or valves with foam covers or blankets. Wrap vulnerable pipes with pipe insulation sleeves.

When to Winterize in Denver

The ideal time to winterize is late September through mid-October, before the first freeze. Denver's first freeze typically occurs in early October, so don't wait.

If you're unsure about any step, or if your system uses specialized components, contact Flores Sprinkler & Landscape LLC. Our team offers professional winterization services that guarantee your system survives Colorado's winter intact. We'll handle the entire process and ensure you're ready for spring watering season.

Proper winterization takes a weekend of your time now—or thousands of dollars in spring repairs. The choice is yours.