As summer comes to an end, many Minnesota homeowners begin preparing their homes for winter. Leaves need to be cleaned up, lawn equipment gets stored away, and gardens are put to bed for the season.

One task that’s often overlooked—but can be one of the most important—is winterizing your irrigation system.

Failing to properly blow out your sprinkler system before freezing temperatures arrive can result in cracked pipes, broken sprinkler heads, damaged valves, and costly repairs come spring.

The good news? A professional irrigation blow out is quick, affordable, and provides peace of mind throughout the winter.

In this guide, we’ll explain why irrigation blow outs are essential, when you should schedule yours in Minnesota, and what homeowners can do to protect their investment.

Why Does an Irrigation System Need to Be Blown Out?

Even after shutting off your sprinkler system, water remains trapped inside the underground pipes, sprinkler heads, valves, and fittings.

When temperatures drop below freezing, that trapped water expands as it turns to ice.

Because water expands by nearly 9% when it freezes, it creates tremendous pressure inside the irrigation system.

Unlike garden hoses that can often stretch slightly, underground PVC and polyethylene irrigation pipes have very little room to expand. Something eventually has to give.

The result can include:

Cracked underground pipes
Split fittings
Broken sprinkler heads
Damaged valves
Cracked backflow preventers
Leaks that aren’t discovered until spring

Many of these repairs require digging up your yard and replacing damaged components—costs that can usually be avoided with proper winterization.

When Is the Best Time to Blow Out an Irrigation System in Minnesota?

One of the most common questions homeowners ask is:

“Should I blow out my sprinkler system before the first freeze?”

The answer is yes—but not too early.

In most parts of Minnesota, the ideal time to schedule an irrigation blow out is:

Late September through mid-October.

This timing allows you to continue watering your lawn and landscape during the early fall while ensuring your system is protected before hard freezes arrive.

Waiting until after several nights of freezing temperatures increases the risk of damage.

Because every year is different, we recommend scheduling your blow out before your area’s first hard freeze, rather than waiting until temperatures have already dropped well below freezing.

What Happens During a Professional Irrigation Blow Out?

A professional blow out involves much more than simply turning on an air compressor.

Using a commercial-grade air compressor designed specifically for irrigation systems, each zone is cleared individually to safely remove water from the underground piping.

A typical blow out includes:

Shutting down the irrigation water supply
Draining the backflow preventer when applicable
Connecting professional air equipment
Blowing out each irrigation zone individually
Clearing sprinkler heads until only a fine mist remains
Relieving pressure from the system
Leaving the irrigation system safely winterized

Using the correct air pressure and volume is essential. Too little air leaves water behind, while excessive pressure can damage sprinkler heads, fittings, or piping.

Can I Blow Out My Own Sprinkler System?

While it may be possible, most homeowners don’t have access to the type of air compressor needed to properly winterize an irrigation system.

Small portable compressors often lack the airflow (CFM) required to push water through an entire irrigation zone.

Using the wrong equipment—or incorrect air pressure—can leave water trapped in the system or even damage irrigation components.

For most homeowners, hiring a professional is the safest and most reliable option.

What Happens If You Skip a Blow Out?

Some winters are mild.

Others arrive early with sudden temperature drops.

The problem is that you never know which kind of winter Minnesota will have.

Skipping a blow out can lead to problems such as:

Underground leaks
Zones that no longer operate correctly
Low water pressure
Broken sprinkler heads
Valve failures
Costly spring repairs
Water waste after startup

Even if your system survives one winter without damage, it doesn’t mean it will survive the next.

Winterizing every year is inexpensive insurance against much larger repair bills.

Should You Wait Until the Leaves Have Fallen?

Many homeowners assume they should wait until all of the leaves have dropped before scheduling a blow out.

In reality, leaf cleanup and irrigation winterization are two separate services.

Your irrigation system should be winterized based on the weather—not the leaves.

If an early freeze arrives while you’re waiting to finish fall yard work, your irrigation system could already be at risk.

Don’t Forget About Your Backflow Preventer

If your irrigation system includes an above-ground backflow preventer, it’s especially important to winterize it correctly.

Backflow devices are one of the most expensive components of an irrigation system and are highly susceptible to freeze damage.

Proper draining and winterization help protect this critical piece of equipment throughout the winter months.

Why Schedule Early?

Every fall, irrigation companies experience a surge in demand as homeowners rush to schedule blow outs before freezing temperatures arrive.

Waiting until the forecast predicts a freeze may leave you scrambling for an available appointment.

Scheduling early offers several benefits:

Better appointment availability
Less stress before winter
Protection before unexpected cold weather
Time to address any issues found during winterization

Booking ahead also helps ensure your irrigation system is serviced before crews become fully booked.

How Long Does an Irrigation Blow Out Take?

Most residential irrigation systems can be professionally winterized in 20 to 45 minutes, depending on:

Number of irrigation zones
Property size
Water source
Accessibility of equipment
System layout

Larger properties with additional zones or more complex systems may take longer.

Protect Your Investment This Winter

A professionally installed irrigation system is a valuable investment that keeps your lawn and landscape healthy throughout the growing season.

Protecting that investment during Minnesota’s harsh winters is one of the simplest—and most important—maintenance tasks homeowners can perform.

For a relatively small cost, an annual irrigation blow out can help prevent expensive repairs, unexpected spring delays, and unnecessary headaches.

Schedule Your Fall Irrigation Blow Out with Sandvig Services

At Sandvig Services, we use professional-grade equipment to safely winterize irrigation systems throughout Minnesota.

Our irrigation blow out service is designed to remove water from your system before freezing temperatures arrive, helping protect your pipes, valves, sprinkler heads, and backflow preventer all winter long.

Appointments fill quickly each fall, so we recommend scheduling early to secure your preferred date before the first hard freeze.

If you’re ready to winterize your irrigation system, contact Sandvig Services today to schedule your professional fall irrigation blow out and enjoy peace of mind knowing your system is protected until spring.

Fall Irrigation Blow Outs in Minnesota: When Is the Best Time to Winterize Your Sprinkler System?