North Idaho's first hard freeze can arrive with little warning, and one of the most expensive things it can catch is a sprinkler system full of water. When water trapped in irrigation lines freezes, it expands — cracking pipes, splitting backflow preventers, and turning a skipped winterization into a spring repair bill.
The standard defense is to blow out the system: shut off the irrigation water supply, then use an air compressor to force the remaining water out of every zone, valve by valve, before freezing temperatures settle in. Many homeowners hire a lawn-care professional for this — it's quick, inexpensive compared to repairs, and worth scheduling early, since pros book up fast in October.
If you do it yourself, use a compressor sized for the job, work through each zone briefly, and wear eye protection. Never stand over a sprinkler head while air is flowing. And whether you DIY or hire out, finish the job before the first hard freeze, not after.
Hoses need attention too. Disconnect every garden hose from its spigot, drain the water out, and coil the hoses for storage. A hose left attached can trap water against the faucet and crack the spigot — or freeze solid and become fragile. Never try to straighten or move a hose that's frozen; let it thaw first.
Drain low-point valves and any outdoor fixtures that hold water, and turn off water to outdoor faucets if your home has a separate shutoff. A little air left in the lines is your friend — it's the water that does the damage.
Finally, make sure everyone in your household knows where the main water shutoff is. In a freeze emergency — a burst pipe at 2 AM — the fastest way to limit damage is to get the water off. If you don't know where yours is, find it on a calm Saturday afternoon, not during a crisis.
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