Why Winterizing Your Sprinkler System Before a Freeze Matters

As crisp autumn weather settles across Colorado, lawns naturally enter dormancy and need less attention. One important seasonal task is preparing your sprinkler system for freezing weather.

Water left in irrigation pipes and equipment can freeze, expand, and damage system components. Proper winterization can help prevent problems that may otherwise go unnoticed until spring.

Why Freezing Water Can Damage Sprinkler Systems

As water freezes, its volume increases by about one-eleventh. That expansion can create enough pressure to crack pipes and fittings, damage valves, or split sprinkler and pump cases. Colorado State University Extension explains the expansion and its potential effects on sprinkler systems.

Damage may not be visible during winter. When the system is turned on again, it can show up as leaks, wet areas in the yard, or sprinkler zones that do not work properly.

When to Schedule Winterization

There is no single date that suits every property across the Front Range and Denver Metro area. Elevation, local conditions, and the weather can vary across the region, so plan ahead of freezing temperatures rather than relying on one calendar date.

For context, the National Weather Service lists October 7 as Denver’s average date of first freeze. That figure refers to a freeze—not necessarily a hard freeze—and does not represent every community in the Front Range. See the NWS Denver freeze-date statistics.

Consider scheduling before sustained freezing weather is forecast. If you’re arranging professional service, planning ahead can also help you avoid a last-minute rush.

Why Turning Off the Water Isn’t Always Enough

Turning off the irrigation water supply or setting the controller to “rain delay” does not necessarily remove water already in the system. Depending on the system’s design, water may remain in pipes, valves, or other components.

Colorado State University Extension recommends clearing water from the irrigation system and cautions that gravity-drain valves alone may not remove all the water. The right winterization method depends on the system. Read CSU Extension’s winterization guidance.

Backflow devices need special attention. CSU Extension says Pressure Vacuum Breaker (PVB) and Reduced Pressure (RP) devices should not be blown out with compressed air. Follow the device manufacturer’s instructions for draining and winterizing these assemblies, or have a qualified professional handle the work. See CSU Extension’s guidance for PVB and RP devices.

Protect Your Sprinkler System Before Freezing Weather

Winterizing your sprinkler system before freezing weather can help prevent damage and springtime surprises. Because systems and backflow devices differ, use the appropriate procedure for your equipment.

If you need help winterizing your system, Justin Time Plumbing is here to help.

Call or text 303-408-3051 to schedule service or speak with a professional today.