A drip irrigation system is a highly efficient way to water your plants, delivering water directly to the root zone where it’s most needed. However, as the cold season approaches, it’s crucial to winterize your system to protect it from potential freeze damage.

Why Winterize Your Drip Irrigation System

Winterizing your drip irrigation system is an essential step in maintaining its longevity. Freezing temperatures can cause water left in the system to expand, potentially damaging the tubing and fittings. By properly winterizing your system, you can prevent costly repairs and extend the life of your irrigation system.

What You Will Need

Winterizing your drip irrigation system doesn’t require specialized tools. Here’s what you’ll need:

  • An air compressor (optional)
  • End caps for your drip lines
  • A storage box for system components

Preparing for Winterization

The optimal time for winterizing your irrigation system is before the first frost of the year. Keep an eye on the weather forecast and plan to winterize your system when temperatures start to drop consistently.

Step-by-Step Guide to Winterize a Drip Irrigation System

1. Shut Off the Water Supply

Start by turning off the main water supply to your irrigation system. This will prevent any additional water from entering the system during the winterization process.

2. Drain the Timer & Head Assembly

Next, remove the timer and head assembly (including the backflow preventer, filter, and pressure regulator) from the water source. Drain these components and store them indoors to protect them from freezing temperatures. Don’t forget to remove the batteries from the timer if it has any.

3. Drain Tubing Lines

Open the end caps on your drip lines to allow water to drain out. Walk along your mainlines and lift lines and fittings at low spots to help remove any excess water.

4. Replace End Caps After Draining

Once you’re sure all excess water has been removed from your mainlines, replace the end caps. Also, cap off or plug the threaded end of the female swivel adapter where the head assembly was removed to prevent bugs from entering your system during winter.

Special Considerations for Systems with Valves/Manifolds

If your system includes valves or manifolds, you’ll need to run the timer/controller through its normal watering cycle after the main water supply is turned off. This allows each valve to open and relieves water pressure on the main line and valves. Once the controller has run through its cycles, set it to the “off” position and manually open all valves to reduce the chance of standing water freezing and cracking your manifold components.

Using an Air Compressor to Clear Lines

Some homeowners prefer to use an air compressor to clear lines. If you choose to do this, remember to wear protective gear and keep the air pressure regulator set as low as possible to get the job done. Always have the ends of the line open and protect your hands if using a coupler between the poly tubing and the nozzle of the air compressor.

Post-Winterization Steps

After the system has been winterized, make sure to seal off any open lines and store any removed components in a safe place. This will protect your system from debris, insects, and other potential damage during the winter months.

Spring Start-Up

When spring arrives and it’s time to restart your system, tighten all end caps and check for leaks or any damage that may have occurred over winter. Replace any cracked or damaged components, and install new batteries in your timer if necessary.

Common Mistakes to Avoid

When winterizing your drip irrigation system, be sure to avoid these common mistakes:

  • Not draining the system thoroughly: Leaving water in the system can lead to freeze damage.
  • Forgetting to remove batteries from the timer: Batteries left in over winter can corrode and damage the timer.
  • Leaving open lines: Open lines can attract insects and other pests. Always seal off open lines after winterizing.


Q: Can I leave my drip irrigation system running in winter? A: It’s not recommended to leave your system running during freezing temperatures as this can cause damage to the system components.

Q: Can I winterize my system without an air compressor? A: Yes, you can winterize your system by draining it thoroughly. An air compressor is an optional tool that can help clear lines, but it’s not necessary for all systems.


Winterizing your drip irrigation system is a crucial step in maintaining its longevity and efficiency. By following these steps, you can protect your system from freeze damage and ensure it’s ready to go when spring arrives. A little preparation goes a long way in preserving your investment.

If you’re looking to go the DIY route, be sure to check out our comprehensive guide on the best drip irrigation systems on the market in 2023.

Or, if you’re in over your head, consider hiring a professional irrigation company and taking advantage of their drip irrigation services, if available.