Winterization
Sprinkler winterization
A blowout uses compressed air to push water out of the lines, valves and heads so it doesn't freeze and crack them over winter.
What's usually included
- Shutting off the irrigation water supply
- Blowing out each zone with compressed air
- Setting the controller to off or rain mode
- Draining or protecting the backflow preventer, as the company advises
Book early
Fall is the busiest season. Requesting early gives you more scheduling options before cold weather arrives.
Methods, parts and prices vary by company. Ask each one what's included and whether parts are extra.
What happens during a blowout
- The technician shuts off the irrigation water supply.
- A compressor is connected to the system.
- Each zone is opened in turn and air pushes water out through the heads.
- The backflow device and exposed pipes are drained or protected as the company advises.
- The controller is set to off or rain mode.
Why DIY blowouts go wrong
- Too much air pressure can damage heads and fittings.
- Running air through a zone too long can overheat plastic parts.
- Missing a zone leaves water to freeze.
- Backflow devices can be damaged if not handled correctly.
Related guides
After the blowout
Keep the controller off or in rain mode until spring. If you see water coming from any head after the blowout, or the backflow device shows ice or cracks during a cold snap, contact the company. Mark heads near driveways so snow shovels and plows don't break them.
Questions
Can I winterize myself?
Blowouts use compressed air and can damage parts if done wrong. Many homeowners hire a company.
Do I need to be home?
Usually not, if the company can reach the shut-off and controller. Confirm when booking.
How long does a blowout take?
Many residential systems take under an hour, depending on the number of zones.
Should drip zones be blown out?
Drip lines need winterizing too, often at lower pressure. Mention them in your request.
Sprinklers acting up?
Send the details once and hear back from local irrigation companies.