Every year I have homeowners tell me they didn’t think they needed to winterize their irrigation system in Austin because “it doesn’t really get that cold here.” Then February 2021 happened, and thousands of Central Texas irrigation systems froze, cracked, and turned into expensive spring repairs. The truth is we don’t get the long, deep freezes they get up north — but we get hard freezes, and a single night below freezing is all it takes to split a backflow preventer or a length of exposed PVC. Knowing how to winterize your irrigation system in Austin is cheap insurance against a repair that isn’t.
Here’s how I walk clients through it: when to do it, what’s actually at risk, and the difference between the quick protection most Austin systems need and the full blowout that gives you total peace of mind.
When to Winterize in Central Texas
The trigger isn’t a date on the calendar — it’s the forecast. Once nighttime temperatures start dropping below 32°F consistently, usually sometime in late November or December here, it’s time. I tell people to get the protective steps done early in the fall so you’re not scrambling the night before a freeze warning, and then to keep an eye on hard-freeze events through January and February, which are historically our coldest and most dangerous.
The other half of timing is your controller. Put it in “rain” or “off” mode before the first freeze so the system isn’t running and coating everything in ice on a cold night. There’s no reason for it to water in winter anyway — dormant grass doesn’t need it.
What’s Actually at Risk
The single most vulnerable part of an Austin irrigation system is the backflow preventer — that brass assembly sticking up out of the ground near your main connection. It’s above ground, full of water, and exposed to the air, which makes it the first thing to freeze and crack. Right behind it are any exposed above-ground pipes and, in a hard freeze, the pipes and heads in the shallowest parts of your yard.
At a minimum, every homeowner should wrap the backflow preventer and any exposed piping with insulation — foam covers, insulation tape, or even towels and a plastic bag in a pinch. This baseline step prevents the most common and most expensive freeze damage we see.
The Blowout Process
For full protection — especially on larger systems, newer installs, or properties that have been bitten before — the right answer is a blowout. This is where you shut off the water supply to the system at the main valve, then use compressed air to push all the remaining water out of the lines and heads zone by zone. Water that isn’t there can’t freeze and expand, which is what cracks pipes in the first place.
A blowout isn’t a DIY job for most people — using too much air pressure can damage heads and fittings, and you need to run it zone by zone to do it right. This is one of those jobs where having our team handle it costs less than the repair you’re trying to avoid. If your system ever does take freeze damage, our irrigation repair team can sort it out in spring, but the goal is to never need that call.
A Quick Pre-Freeze Checklist
- Set the controller to “off” or “rain” mode before the first freeze.
- Insulate the backflow preventer and any exposed above-ground pipes.
- For full protection, shut off the system’s water supply and have the lines blown out.
- Watch the forecast through January and February for hard-freeze events.
If you’re planning a new system or upgrading an old one, freeze protection is something we design in from the start — you can read more on our irrigation installation page.
Frequently Asked Questions
Does Austin get cold enough to need irrigation winterization?
Yes. We don’t get sustained northern-style winters, but we get hard freezes every year, and the February 2021 freeze proved how much damage a single severe event can do. Even one night below freezing can crack an exposed backflow preventer. Winterizing is about protecting against those events.
Can I winterize my own sprinkler system?
The basics — shutting off the controller and insulating the backflow preventer and exposed pipes — are absolutely DIY-friendly, and every homeowner should do them. A full compressed-air blowout is better left to a pro, since the wrong air pressure can damage your heads and fittings.
How much does sprinkler winterization cost in Austin?
The insulation materials for the basic steps cost very little. A professional blowout depends on the size and number of zones in your system, which is why we quote it per property. It’s a small fraction of what a cracked manifold or backflow assembly costs to replace in spring.
I’m Ferris MyCue, owner of Grass Works Lawn Care. If you’d rather not gamble on the forecast, reach out for a free estimate and we’ll get your system protected before the first freeze.