How to Winterize Your Sprinkler System in Utah

Winterize your sprinkler system in Utah before the first hard freeze, typically mid-October in the Salt Lake Valley. The process involves shutting off the main water supply, draining the backflow preventer, opening drain valves, and blowing out remaining water from underground pipes with an air compressor. A professional blowout costs $75-$150 and is strongly recommended.

When to Winterize

Salt Lake Valley: Mid-October. Utah County: Early-mid October. Park City: Late Sept-early Oct. St. George: Late Oct-early Nov. Watch for freeze warnings.

Method 1: Professional Blowout

Costs $75-$150. Professional truck-mount compressor (80-120 CFM) forces water out of all pipes. Best for all systems, especially PVC. Why worth it: Frozen pipes cost $500-$2,000+ to repair in spring.

Method 2: Manual Drain

Only works if system has drain valves at low points. Shut off main water, open drain valves, run each zone for 30-60 seconds with water off. Remove and drain backflow preventer.

Winterizing the Backflow

The backflow is the most vulnerable part. Shut off ball valves, open test cocks to drain, remove caps and store for spring. Wrap with foam insulation if exposed. Frozen backflow costs $150-$400 to replace.

What NOT to Do

Don't use antifreeze (expensive and environmentally harmful). Don't leave water in sprinkler heads. Don't forget outdoor spigots — disconnect hoses and shut off indoor valves.

See our irrigation system maintenance and winter property maintenance tips.

DIY Air Compressor

Minimum 10 CFM at 40-80 PSI. Most home compressors aren't enough. Renting a tow-behind compressor costs $80-$150/day. A $75-$150 professional winterization is cheap insurance.

For more, see our summer lawn maintenance tips and fall cleanup guide.

Frequently Asked Questions

When should I winterize in Utah?
Mid-October for Salt Lake Valley. Before first hard freeze.

Can I winterize without a compressor?
Only if system has manual drain valves at all low points.

How much does winterization cost?
$75-$150 for a typical system.

What happens if I don't winterize?
Water freezes and cracks pipes. Spring repairs cost $500-$2,000+.

For professional sprinkler winterization, contact TruCo Services.