Winterizing Your Sprinkler System: A Comprehensive Guide for Michigan Homeowners

As winter approaches in Michigan, homeowners need to prepare their properties for the colder months ahead. One essential aspect of this preparation is winterizing your sprinkler system. Failing to properly winterize your system can lead to significant damage and costly repairs when spring arrives. Here’s a detailed guide to help Michigan homeowners ensure their sprinkler systems are ready for winter.

Why Is Winterizing Your Irrigation System Essential?

Michigan experiences a range of temperatures during the winter months, with average lows dropping below freezing from November through March. In areas like the Upper Peninsula, temperatures can plummet significantly, while southern Michigan might see somewhat milder conditions. Regardless, it’s essential to prepare for freezing temperatures and potential snow and ice accumulation.

This cold weather can cause water left in your sprinkler system to freeze, expand, and cause damage to pipes, valves, and sprinkler heads to burst or crack. By taking the necessary precautions, you can avoid costly repairs, extend the lifespan of your irrigation system, and ensure your irrigation system is in good shape when the weather warms up.

When to Winterize Your Sprinkler System In Michigan

In Michigan, it’s crucial to winterize your sprinkler system before the first hard freeze. Typically, this occurs in late October to early November. However, timing can vary depending on specific local weather patterns. Keep an eye on the weather forecast and be prepared to act when temperatures are expected to drop below 32°F (0°C). Avoid the first significant snowfall, as this can complicate the process further.

Steps to Winterize Your Sprinkler System In Michigan

By following these steps, Michigan homeowners can protect their sprinkler systems from the harsh winter conditions and ensure they are ready to deliver lush, green lawns come spring. 

1. Turn Off the Water Supply

The first step in winterizing your sprinkler system is to turn off the main water supply. Locate the main water supply valve, also known as the shut-off valve, which is usually found in your basement, garage, or a designated irrigation box. Turn this valve to the “off” position to stop water from flowing into your system. This step is crucial to prevent any water from remaining in the pipes that could freeze and cause damage.

2. Drain the System

Once the water supply is turned off, you need to remove any remaining water from the pipes and sprinkler heads. There are a few methods to do this:

• Manual Drain: If your system has manual drain valves, open these valves to allow water to flow out—these valves are usually located at the lowest points of your system. This method is effective for systems with low-pressure zones. After opening the valves, ensure all water has been drained. This might require waiting a few minutes or using a towel to soak up residual water.
• Automatic Drain: Some systems have automatic drain valves that open when water pressure drops. Ensure these valves are functioning correctly and fully drained, making sure that no water is left in the system.
• Blow-Out Method: The most reliable method for removing all water from your system is the blow-out method. This involves using an air compressor to blow air through the pipes and sprinkler heads, expelling any remaining water. If your system uses compressed air for winterization, connect an air compressor to the system’s blowout port. Slowly and carefully blow out the water from the pipes using the compressor. Ensure you use the correct pressure levels to avoid damaging the system. After blowing out the water, check for any remaining moisture and ensure that all lines are clear.

3. Remove and Store Sprinkler Heads

If your sprinkler heads are removable, take them out, clean them, and store them in a dry, indoor location. This will protect them from freezing and potential damage. This is particularly important for pop-up heads that could be susceptible to freezing. If they are not removable, ensure they are thoroughly drained and covered to protect them.

4. Insulate Exposed Components

Any exposed pipes, valves, sprinkler heads, or backflow preventers should be insulated to protect them from freezing temperatures, snow, and ice. Use insulating materials such as foam pipe sleeves, insulation tape, insulated covers, or tarps. Pay special attention to parts that are above ground or in unprotected areas. 

5. Winterize the Controller

Most sprinkler system controllers are designed to withstand cold weather. However, if your controller is located in an unheated area or exposed to harsh weather, consider moving it to a more protected location or using an insulating cover.

6. Check and Repair Any Damage

Before winter sets in, inspect your system for any signs of damage or leaks.

• Sprinkler Heads: Examine each sprinkler head for any cracks, breaks, or signs of wear. Pay close attention to pop-up heads, as they can be particularly susceptible to damage from freezing. If you notice any damaged heads, replace them before winter to prevent water leakage and ensure they function properly come spring.
• Pipes and Tubing: Check all visible pipes and tubing for signs of leaks, cracks, or corrosion. Look for any areas where the pipe might be disconnected or where joints may have come loose. Any visible damage should be repaired to avoid potential issues with freezing and to maintain system efficiency.
• Valves: Inspect the valves for any signs of damage or leakage. Ensure that all manual and automatic valves are functioning correctly and that there are no obstructions or issues with the valve seals. Leaking valves can cause water loss and may lead to system damage during the winter.

Repair any issues and replace any broken pieces you find to prevent further complications during the winter months. Addressing these problems early can save you from more significant repairs when you restart your system in the spring.

7. Plan for Spring

Mark your calendar to schedule spring startup for your sprinkler system. Homeowners in Michigan should plan to start their irrigation system up around mid-late May or when there are no freezing temperatures in the future forecast. In the spring, you’ll need to ensure that your system is fully operational and address any issues that may have arisen during the winter.

Consider Professional Lawn Irrigation Services

If you’re unsure about any part of the Michigan winterization process or prefer to leave it to the experts, consider hiring our professional lawn irrigation service. Our team of local experts at Grosse Ile Lawn Sprinkler & Fertilizing has the tools and expertise to ensure your system is properly winterized and ready for the winter months, as well as help you start up your system in spring and maintain it year-round.