You just checked the forecast and saw temperatures dropping toward zero. Your neighbor’s sprinklers are already blown out and winterized, and you know leaving water in your lines is a gamble you don’t want to take. Every Calgary winter, hundreds of irrigation systems get destroyed by freeze damage — not because the owners didn’t care, but because they waited too long or hired someone who rushed through the job with undersized equipment. J.G. Irrigation handles winterization across Calgary using commercial-grade compressors that fully clear every zone. Read about the real cost of freeze damage if you wait too long — then book your blowout before the temperature drops.
Winterization is not complicated in theory — blow out the water, shut it down. But the difference between a system that starts up perfectly in spring and one that leaks from six different freeze-cracked fittings is how thoroughly the job gets done. Here is why Calgary homeowners choose J.G. Irrigation for their winterization year after year.
We use commercial-grade tow-behind compressors. A small home compressor does not move enough air volume to clear water from long pipe runs. Our commercial unit delivers the CFM (cubic feet per minute) required to push water completely out of every lateral line, not just the main. We run each zone until the heads blow nothing but mist — no water droplets, no sputtering. Water left in a low spot is a cracked pipe waiting to happen.
We do every zone twice. First pass clears the bulk of the water. Second pass gets what settled back into low points after the first blowout. Most companies do one pass and call it done. I have seen the inside of enough freeze-split pipes to know that one pass is not enough.
We inspect every component during the process. While cycling through zones, I check every head, every valve box, and the backflow preventer for existing damage or wear. If I find something that needs attention, I tell you. You can decide to fix it now while the system is still accessible, or plan for it in spring. Either way, you know about it.
We shut down and protect the entire system. After the blowout, we shut off the main water supply to the irrigation system, drain the backflow preventer, and insulate any above-ground components. The controller gets powered down or set to a winter mode. Nothing gets left to chance.
Priority scheduling for returning customers. Once you have winterized with us, you are in our system and we reach out in late September to get you on the schedule before the rush. No scrambling, no panic calls.
Winterization done right takes time and the right equipment. Here is exactly what happens when we arrive at your property.
Before any air goes into the lines, I locate your backflow preventer and main shutoff valve. I check the backflow for any existing cracks or leaks — if the backflow is already compromised, compressed air can make it worse, so I need to know before pressurizing. The compressor gets connected downstream of the backflow preventer through the proper blowout port or a designated access fitting. We never blow air through the backflow device itself — that is how backflow preventers get destroyed.
Starting with the zone farthest from the compressor, I open each zone one at a time and introduce compressed air at regulated pressure. Poly pipe can handle roughly 50 to 60 PSI during blowout — any higher and you risk blowing fittings apart underground. PVC systems run lower. I watch the heads on each zone and keep the air flowing until the spray pattern shifts from water to fine mist. This typically takes 2 to 3 minutes per zone depending on pipe length and volume.
After every zone has been blown once, I cycle back through all of them a second time. Why? Water settles. After the first pass, residual moisture in the pipes collects in low spots and elbows. The second pass clears what settled. This is the step most winterization services skip because it adds 15 to 20 minutes to the job. It is also the step that prevents the freeze damage I spend every May repairing for homeowners who used a different company the previous fall.
The controller gets set to “off” or “rain mode” — not unplugged entirely, because some controllers lose their programming when they lose power. The main water supply to the irrigation system gets shut off at the isolation valve. If your system has an indoor shutoff, I locate it and confirm it is fully closed. The backflow preventer gets drained and any ball valves are left at a 45-degree angle so trapped water has room to expand without cracking the housing.
I walk the property with you and confirm every zone was blown, the water is off, and the controller is set. If I found any issues during the inspection, I give you a quick summary — nothing formal, just a heads-up so spring startup goes smoothly.
If you need any repairs done before winter shutdown, I can handle those on the same visit. Better to fix a small leak now than discover a bigger problem in spring.
Calgary’s first hard freeze can arrive with almost no warning. If you have not booked your blowout yet, call 587-433-4795 this week — once the temperature drops below zero, frozen lines become a repair call instead of a winterization call.
Winterization pricing in Calgary typically runs between $120 and $200 depending on system size and zone count. Here is the breakdown.
Standard residential blowout — $120 to $160. Covers systems with up to 8 zones. Includes full compressed air blowout (two passes per zone), controller shutdown, backflow drain, and main water shutoff.
Larger residential systems — $160 to $200. Systems with 9 to 14 zones, or properties with multiple valve boxes spread across a larger yard. The additional cost reflects the extra time required.
Commercial and multi-family properties — quoted individually. System size, zone count, and pipe diameter vary too widely for flat-rate pricing. Call or book a consultation and I will provide a firm quote based on your specific layout.
Backflow preventer insulation covers — $35 to $55. An insulated cover adds an extra layer of freeze protection for above-ground backflow devices. Not required but worth considering if your backflow is exposed to direct wind.
For customers who want to lock in both spring startup and fall winterization at a bundled rate, our seasonal contract covers both visits plus priority scheduling and discounted repair labor. Most Calgary homeowners with irrigation systems find the contract pays for itself the first time they need a mid-season repair at the reduced rate.
Compare these prices against what freeze damage costs to repair — a single cracked valve replacement runs $180 to $350. A split poly line that requires excavation can hit $400 to $600. Winterization is the cheapest insurance policy your sprinkler system will ever have.
I repair freeze-damaged systems every spring. Here is what breaks, why it breaks, and what it costs to fix.
Cracked spray heads and rotor heads — $45 to $120 per head. Water trapped inside the head housing freezes, expands, and splits the plastic from the inside out. When the system pressurizes in spring, the crack opens and the head sprays water in every direction except where it should. One zone might have 4 to 6 heads. Multiply accordingly.
Split valve bodies — $180 to $350 per valve. Valve bodies hold water in their lower chambers. When that water freezes, the brass or plastic housing cracks. A cracked valve often leaks continuously even when the zone is off, which means your water bill climbs until you notice the soggy patch in your lawn.
Ruptured poly or PVC lines — $250 to $600 depending on depth and accessibility. This is the worst-case scenario. Water trapped in a low spot in the line freezes and expands with enough force to split the pipe along its length. Repair requires digging down to the pipe, cutting out the damaged section, and splicing in a new piece. If the break is under a driveway, walkway, or mature landscaping, the cost and complexity multiply.
Backflow preventer damage — $300 to $700. Above-ground backflow devices are the most exposed component in your system. If not properly drained, the internal check valves and springs freeze and deform. A damaged backflow will not hold pressure and often needs full replacement — not a repair.
Total cost of skipping a $150 blowout: $400 to $1,400 in spring repairs. I see this math play out every April and May. The homeowners who call me in October are happy in spring. The ones who call me in April are paying three to ten times more.
J.G. Irrigation provides winterization and sprinkler blowout services across all Calgary quadrants — northwest, northeast, southwest, and southeast. We cover communities including Tuscany, Evanston, Panorama Hills, Aspen Woods, Springbank Hill, Evergreen, Cranston, Mahogany, McKenzie Towne, and everywhere in between. We also handle winterization in Airdrie, Cochrane, Chestermere, Okotoks, and surrounding acreages within a reasonable drive.
After winterization, your system is fully shut down and protected until spring. When temperatures warm up, our spring startup service reactivates the system safely with a controlled re-pressurization — the same crew, the same attention to detail.
Ideally, book your blowout by mid-October. Calgary’s first hard freeze typically arrives between late September and the third week of October, but it varies from year to year. Once daytime temperatures consistently drop below 4°C and nighttime temperatures approach freezing, you are on borrowed time.
If you call and the ground is already frozen, we can still blow out the system. However, if ice has already formed inside the lines, damage may have already occurred. Book early—the last two weeks of September and the first two weeks of October are our busiest stretch for a reason.
A typical home compressor rated for nail guns and tire inflation does not move enough air volume — CFM is what matters, not PSI. You need sustained airflow at 20 to 50 CFM to clear water from irrigation lines. Most home compressors top out at 5 to 10 CFM. What happens when you try it anyway: you blow some water out of the first zone, the compressor tank empties, pressure drops, and water in the remaining zones stays right where it is. I take multiple calls every spring from people who tried the DIY route and are now paying me to replace freeze-cracked components. The cost of my winterization service is less than the cost of one repair visit.
No, but access to the backyard and the controller (usually in the garage or basement) is required. Most customers give me the gate code or leave a side gate unlocked. I complete the full blowout, leave the system shut down, and send you a quick summary of what was done and anything I noticed. If I find an issue that needs attention, I will call or text before doing any additional work.
Winterization is not the irrigation service you think about in July. But it is the one that determines whether your system starts up clean in May or leaks from every freeze-cracked fitting. I have been winterizing Calgary sprinkler systems for 16 years, and I do every zone twice because I have seen what one pass leaves behind. Do not wait until there is frost on the ground. Call J.G. Irrigation at 587-433-4795 or book your appointment online. Once the freeze hits, a winterization call becomes a spring repair bill.
