When to Winterize Your Sprinkler System in Omaha
If you live in the Omaha metro area, winterizing your sprinkler system isn't optional — it's one of the most important things you can do to protect your investment before the ground freezes. But one of the most common questions we hear at Alternate Rain is simple: when, exactly, should I do it?
The answer depends on a few factors specific to our climate, your system type, and your yard. Here's what you need to know.
The Short Answer: Late September Through October
For most Omaha-area homeowners, the ideal winterization window is late September through the end of October. That's the window where overnight temperatures start dipping toward freezing consistently, but before the ground hardens enough to cause problems if water is still sitting in your lines.
We typically begin taking winterization calls in end of September and stay fully booked through most of October. If you're reading this in October and haven't scheduled yet, now is the time.
The Real Trigger: Overnight Temperatures Below 32°F
Rather than going by the calendar alone, watch the overnight forecast. The rule of thumb is this:
Once overnight lows are consistently dropping to 32°F or below, your system needs to be winterized.
A single cold night won't necessarily cause a burst pipe, but repeated freeze-thaw cycles put stress on fittings, heads, and backflow preventers. The risk compounds quickly once temperatures start dropping into the mid-20s — at that point, water left in your lines can freeze and expand with enough force to crack PVC pipe, split valve bodies, and destroy backflow preventers that can cost hundreds of dollars to replace.
In Omaha, that threshold is typically reached somewhere between mid-October and early November, depending on the year. But we've seen early hard freezes hit in late September, and we've seen mild Octobers that pushed the window later. Don't bet on the late end of that range.
What About Self-Draining Systems?
If your sprinkler system was installed by Alternate Rain, there's a good chance you have a self-draining system — which means your pipes are sloped to drain automatically when the system shuts down, rather than holding standing water that can freeze. Self-draining systems are designed to protect themselves, which is one of the reasons we install them as standard. Learn more about how our self-draining systems work.
Don't Wait Until the Last Minute
Every year, we get calls in late October and early November from homeowners who waited too long. By that point, our schedule is full and the first hard freeze is right around the corner. In some cases, homeowners have to wait — and that waiting can mean a cracked backflow preventer or a split line discovered in the spring.
The best time to schedule your winterization is before the rush — ideally in early to mid September. You'll have your pick of appointment times, and you'll have peace of mind going into the cold months knowing your system is protected.
Already Missed the Window? Here's What You Can Do
If our schedule is full and you haven't been able to get your blowout done yet, there's a temporary measure you can take to reduce your risk while you wait for an appointment:
Shut off the water supply to your sprinkler system at the main irrigation shutoff valve
Winterize your backflow preventer by turning the shutoff handles on both sides of the unit to 45 degrees — this allows water to pass on both sides of the ball valve rather than trapping it where it could freeze. Most backflow preventers also have a drain at the bottom that can be turned to 45 degrees as well. Additionally, open the small test cock nipples on the body of the backflow preventer — turning these allows air inside, which helps prevent any remaining water from freezing
This won't replace a professional blowout, but it removes the water from the most vulnerable parts of the system and can buy you time until we can get there.
Important exception: if temperatures are consistently freezing and frost is beginning to penetrate the ground, this temporary measure may not be enough. At that point, the risk of frozen lines increases significantly and you should contact us as soon as possible. The sooner we can get to you, the better.
Signs You've Waited Too Long
If any of the following apply, contact us right away:
You've already had a hard freeze (below 28°F overnight)
You notice frost on your lawn in the morning
Your controller is still set to run and temperatures have been below freezing
You can't remember if your system was winterized last fall
In these cases, it's still worth getting a blowout done — and worth having us inspect the system for damage at the same time.
What Happens If You Skip It?
We'll save the full breakdown for a future post, but the short version is: water expands when it freezes. That expansion has to go somewhere, and it usually finds the path of least resistance — a cracked pipe fitting, a split valve body, or a destroyed backflow preventer. Spring repairs from skipped winterizations typically run anywhere from a few hundred dollars to over a thousand, depending on what froze.
Winterization costs a fraction of that. It's the easiest insurance policy you can buy for your irrigation system.
Schedule Your Winterization with Alternate Rain
Alternate Rain serves the entire Omaha metro area — including Elkhorn, Papillion, Bellevue, Gretna, Bennington, Waterloo, La Vista, Blair, and Valley. We've been winterizing irrigation systems in this area for over 40 years, and we know exactly what our climate demands. If you have questions about your system or want to learn more about what's included, visit our winterization service page or take a look at our seasonal care packages — which include startup, mid-season check, and winterization in one annual plan.
Contact Alternate Rain today to schedule your winterization before the season fills up. Don't wait for the first freeze to remind you.