Winterization protects your irrigation system from freeze damage, burst pipes, and costly spring repairs—but knowing what questions to ask your contractor makes all the difference. Most homeowners aren't sure what the process actually involves, how much it costs, or when to schedule it. Here are the questions that matter most when hiring an irrigation winterization service.
When Should You Schedule Winterization?
Timing is critical. Ideally, you want winterization done before the first hard freeze—typically mid-October through early November in northern climates, and later (November to December) in milder regions. Don't wait until after a freeze warning; contractors get booked up fast, and frozen lines become an emergency repair instead of preventive maintenance.
Ask your service provider: "When do you recommend winterization based on our local frost dates?" A good contractor will have specific dates for your area and can explain why delaying puts your system at risk.
What Does the Process Actually Include?
Winterization isn't one-size-fits-all. The core steps typically include:
- Draining the mainline – Removing water from the primary supply line
- Blowing out zone lines – Using compressed air to expel water from each sprinkler zone
- Shutting off the controller – Powering down the timer system
- Protecting backflow preventers – Covering or winterizing anti-siphon devices
- Closing the main shutoff valve – Isolating the water supply
Some systems also need pressure relief valve flushing or drain valve inspection. Ask: "Will you be using compressed air, and what pressure level?" (Typically 80–100 PSI for residential systems). Also confirm whether they'll inspect your backflow preventer and valves for damage.
How Much Does Winterization Cost?
Expect $150–$400 for a typical residential system, depending on:
- System size and number of zones
- Local labor rates
- Whether repairs are discovered during the process
- Your location's climate severity
A small 4–6 zone system in a moderate climate might cost $150–$200. A larger system with 12+ zones or in a colder region could run $300–$400 or higher. Get quotes from at least two providers—use Mercoly to compare local irrigation services and their pricing side by side.
Ask: "Does your winterization quote include inspections, or are repairs billed separately?" This prevents surprise charges if they find a leaking valve or cracked fitting.
What About Spring Turn-On?
Many contractors bundle winterization and spring activation into a package. Spring turn-on (typically March–April) reverses the process: they refill lines, reactivate the controller, check pressure, and run a test cycle. Bundled pricing often runs $250–$600 total, which is cheaper than paying for both visits separately.
Confirm whether spring service is included and what happens if issues appear during activation (some contractors warranty their winterization work and handle minor fixes at no charge).
Should You Do It Yourself?
Don't. Most homeowners lack the proper air compressor (you need one rated for continuous duty at sufficient PSI) and don't know the pressure settings for different line types. Incorrect pressure can damage sprinkler heads or underground pipes. System damage from a DIY mistake costs $500–$2,000+ to repair.
What Questions Should You Ask Your Contractor?
Before hiring, ask:
- "Are you licensed and insured?" – Non-negotiable for any work on your property.
- "Will you inspect the system while winterizing?" – Good contractors spot worn valves, cracked heads, or pressure issues before they become expensive problems.
- "What's your guarantee?" – Do they stand behind their work if pipes freeze anyway?
- "Do you handle both winterization and spring turn-on?" – Easier coordination and accountability.
Frequently Asked Questions
Q: Can I winterize my system if the temperature has already dropped below freezing? Yes, but do it as soon as possible—water trapped in lines expands and causes damage. Call a contractor immediately rather than waiting for milder weather.
Q: Will winterization damage my sprinkler heads or valves? Not if done correctly. A licensed contractor uses appropriate pressure, proper drainage techniques, and inspects components during the process.
Q: What happens if I skip winterization one year? Frozen water in pipes expands and cracks lines, valves, and backflow preventers. Repairs typically cost $400–$1,500+, far more than the $150–$400 winterization would have cost.
Ready to protect your system? Find and compare trusted irrigation winterization providers in your area on Mercoly today.