Twin Cities East Metro

Sprinkler blowouts and winterization

In Minnesota, water left in an irrigation system freezes, expands, and cracks whatever is holding it — heads, valves, backflow assemblies, and buried lines. A compressed-air blowout clears the system before that happens. We run them from late September through early November, before the first hard freeze.

Call 651-364-7186 Book a Blowout

★★★★★ 5.0 from 106 Google reviews · Licensed MN contractor TS100097

Late Sept–Novblowout season

Flat-Ratequoted before we start

5.0 ★from 106 reviews

TS100097licensed & insured

When to book: Late September to early November, before the first hard freeze
Busiest window: The last two weeks of October fill first
What it prevents: Cracked heads, split valves, burst mainlines, damaged backflow
Equipment: Commercial compressor — 110 CFM, far beyond a home unit
Included free: Covered every year with a membership

Why a blowout matters here specifically

Minnesota doesn't freeze gently. The ground freezes deep, and it freezes and thaws repeatedly through the season. Water trapped in a lateral line expands roughly nine percent when it turns to ice, and it has nowhere to go — so it splits the pipe, cracks the head body, or ruptures the valve diaphragm.

The damage rarely announces itself in autumn. It shows up in spring, when you turn the system on and a zone won't pressurise, or water surfaces in the middle of the lawn. A mainline break found in May costs several times what the blowout would have.

Why draining it yourself usually isn't enough

Two things make a DIY blowout unreliable. The first is volume: clearing a residential zone properly needs somewhere in the range of 80-120 CFM of airflow, and a typical homeowner compressor delivers closer to 10 to 15. It will make noise and move some water, but it won't clear the laterals.

The second is pressure. Too much pressure through a system with the water evacuated will destroy the components you're trying to protect — gears in rotor heads, diaphragms in valves. The right blowout is high volume at controlled pressure, zone by zone, and it's the combination that matters.

What we do on site

Shut off the water supply and isolate the backflow assembly
Connect a commercial compressor at the appropriate point
Blow each zone individually until the heads run dry — not one pass across the whole system
Cycle the backflow valves so nothing is left holding water
Set the controller to its off or rain setting for the season
Flag anything we notice that will need attention at spring startup

That last item matters more than people expect. Autumn is when we find the problems worth fixing before winter rather than after it.

Booking and timing

The window is late September through early November. Earlier than that and you may still want the system; later and you're gambling against the first hard freeze. The last two weeks of October fill up fastest, so if you have a preference on timing, book before the rush.

If you'd rather not track it every year, the $215/year membership includes your blowout and your spring startup, scheduled automatically.

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Blowout questions

When should I winterize my sprinkler system in Minnesota?

Late September through early November, before the first hard freeze. The last two weeks of October fill up fastest, so book early if timing matters to you.

Can I blow out my own sprinkler system?

Usually not effectively. Clearing a residential zone needs roughly 80-120 CFM of airflow, and a typical homeowner compressor delivers about 10–15 CFM. Too much pressure with too little volume also risks damaging rotor gears and valve diaphragms.

What happens if I skip the blowout?

Water left in the lines freezes and expands, which can crack head bodies, split valve diaphragms, damage the backflow assembly, and rupture buried lateral or mainlines. The damage typically surfaces at spring startup and costs far more to repair than the blowout would have.

Do I need to be home?

Not usually, as long as we can reach the shutoff, the backflow assembly, and the controller. We'll confirm access when you book.

Is the blowout included in the membership?

Yes. The membership covers both your fall winterization and your spring startup each year, scheduled automatically so you don't have to remember to book.