Sprinkler System Blowouts: Why They Matter and How to Do Them Right

When the colder months roll in, protecting your sprinkler system should be one of the most important tasks on your list. A sprinkler system blowout is a crucial part of winterizing your irrigation system — and skipping it can lead to costly damage once temperatures drop.

So what does a sprinkler blowout do? Blowing out a sprinkler system means removing all water from the pipes, valves, and sprinkler heads using compressed air. This prevents freezing and expansion inside the system, which can crack pipes, burst fittings, and destroy sprinkler heads. Even a small amount of trapped water can cause serious issues, making a proper blowout one of the best ways to protect your investment and avoid repairs in the spring.

How to Blow Out Sprinkler Systems

Performing a sprinkler blowout isn’t overly complicated, but it does require the right tools, some patience, and a careful approach. The goal is to completely clear your irrigation lines of any water while avoiding excess air pressure that can damage components.

How to Blow Out Sprinkler System with Air Compressor

The most common and effective method is using an air compressor. Here’s a step-by-step guide on how to blow out your sprinklers using one:

1. Turn off the water supply – Shut off the main valve that supplies water to your irrigation system.
2. Connect the air compressor – Attach the compressor hose to the blowout port (usually near the backflow preventer or main shutoff valve).
3. Adjust air pressure – Set your compressor to a safe PSI (usually between 50–80 PSI for residential systems). Too much pressure can damage sprinkler heads or fittings.
4. Activate one zone at a time – Using your irrigation controller, manually run each zone until only air is coming out of the sprinklers.
5. Move through each zone – Repeat the process for all zones in your yard.
6. Disconnect and finalize – Once all zones are cleared, disconnect the compressor, close all valves, and leave the main valve slightly open to prevent pressure buildup.

This process ensures that your system is completely free of water before freezing weather hits.

How to Blow Out Sprinkler System Without Air Compressor

If you don’t have access to an air compressor, you can still prepare your system for winter — it just takes a bit more time. Here's how you can do it:

1. Shut off the water supply to the irrigation system.
2. Open all manual drain valves – These are often located at the lowest points of your irrigation lines and at the ends of zones.
3. Let gravity do the work – Allow the system to drain completely. You may need to lift sprinkler heads or open additional lines to release trapped water.
4. Check for standing water – Walk through your yard and look for areas where water may still be trapped in pipes or fittings.
5. Close valves once the water has fully drained.

While this method can help reduce water in the system, it’s typically less effective than using an air compressor. For complete protection, professional blowouts are strongly recommended.

When Should I Blow Out a Sprinkler System?

 The ideal time to blow out your system is before the first hard freeze, typically in early to mid-fall. This timing varies by region, but once overnight temperatures consistently dip below freezing, it’s time to act.

Timing is everything when it comes to winterizing your sprinklers. Waiting too long can allow water in your system to freeze, leading to burst pipes or damaged valves. Getting your blowout done early ensures your system is protected — plus its one less thing to worry about as winter approaches.

Need Help with Your Sprinkler System?

While blowing out your sprinkler system can be done on your own, it’s not always simple — especially if you’re unfamiliar with your irrigation layout or don’t have the right equipment. Using too much air pressure or missing a zone can cause more harm than good.

If you’d rather skip the hassle and make sure it’s done safely and correctly, NatureScape Services can help. Our team provides professional sprinkler system blowouts, installations, and maintenance using high-quality components and efficient, water-saving technology. We handle everything from seasonal startups and winterization to full system repairs and replacements — so your irrigation runs smoothly year-round.

Don’t risk winter damage. Contact us today to schedule your sprinkler blowout or learn more about our services.