Winterize your sprinklers by mid-October — ideally between October 10 and October 25 — before the first hard freeze hits Colorado Springs. Historically, the first sustained freeze (temperatures below 28 degrees for 4+ hours) arrives between October 15 and November 1 in the Pikes Peak region. Missing this window can result in $2,000 or more in burst pipes, cracked valves, and damaged backflow preventers.
A professional sprinkler blowout costs $55 to $95 and takes 20 to 40 minutes. Compared to the cost of replacing split main lines, fractured valve manifolds, or a destroyed backflow preventer, it is the single best return on investment in your entire lawn care calendar.
Why Winterization Matters at 6,035 Feet
Colorado Springs is not just cold in winter — it is uniquely punishing to irrigation systems because of its extreme freeze-thaw cycling. Unlike consistently cold climates where the ground freezes once and stays frozen, Colorado Springs experiences 150+ freeze-thaw cycles per year. Daytime temperatures regularly reach 50 to 60 degrees in January and February, then plunge below 20 degrees the same night.
This repeated expansion and contraction is far more damaging than a single deep freeze. Water trapped in pipes, valves, and fittings expands with enormous force during each freeze event — approximately 2,000 PSI when water turns to ice in a confined space. That force cracks PVC pipes, splits polyethylene tubing at fittings, destroys solenoid valve diaphragms, and can rupture brass backflow preventer bodies.
Components Most Vulnerable to Freeze Damage
- Backflow preventer: The most expensive single component ($300-$800 to replace), mounted above ground and fully exposed to freezing temperatures. Even small amounts of trapped water in the test ports or relief valve can crack the brass body.
- Valve manifolds: Underground valve boxes collect water and are often the last sections to drain naturally. A cracked zone valve costs $75-$150 per valve to replace, plus excavation labor.
- Main supply line: The pipe from your water meter to the first valve — if it cracks underground, you may not notice until spring startup reveals a soggy, flooded section of yard or a massively high water bill.
- Sprinkler heads and risers: Trapped water in swing joints and riser assemblies expands and cracks the fittings. Individual heads are cheap ($5-$15) but multiply that by 30+ heads and add the labor to find and replace each one.
The Blowout Process Explained
A sprinkler blowout uses compressed air to force all remaining water out of the irrigation system after the water supply is shut off. Here is the step-by-step process that professionals follow:
- Shut off water supply: The irrigation shut-off valve (typically in your basement, crawl space, or an underground box near the meter) is closed to isolate the system from the house water supply.
- Open drain valves: Any manual drain valves in the system are opened to release standing water by gravity.
- Connect air compressor: A commercial air compressor (80-100 CFM for residential systems) is connected to the system through a blowout port — usually a quick-connect fitting installed near the backflow preventer or main valve.
- Blow each zone individually: Starting with the zone farthest from the compressor, each zone is activated and blown with compressed air at 50-80 PSI (never exceeding 80 PSI for PVC systems or 50 PSI for polyethylene). Air flows through all pipes and heads until no more water mist exits the sprinkler heads — typically 1 to 2 minutes per zone.
- Repeat each zone: Each zone is blown a second time to catch residual water that may have drained from higher elevations into lower pipes after the first pass.
- Drain backflow preventer: The backflow preventer test cocks are opened, and any remaining water is blown out of the body. The device is left with test cocks partially open (at 45 degrees) to allow expansion during freeze cycles.
- Set controller: The irrigation controller is set to "rain mode" or turned off for winter. Rain mode maintains programming and battery backup without activating any zones.
DIY vs. Professional Blowout
Can you blow out your own sprinkler system? Technically yes, but there are important caveats for Colorado Springs homeowners.
Why Homeowners Choose Professional Service ($55-$95)
- Equipment: A proper blowout requires a commercial compressor rated at 80-100 CFM. Home shop compressors (typically 3-6 CFM) cannot move enough air volume to clear residential irrigation zones. Renting a suitable compressor costs $75-$150 per day — more than hiring a professional.
- Risk of damage: Too much pressure (over 80 PSI) can crack pipes, blow apart glued fittings, and damage rotor internals. Too little pressure leaves water in the system. Professionals calibrate pressure to your specific pipe material and system size.
- Completeness: Professionals know to blow each zone twice, check drain valves, properly position backflow test cocks, and verify no zones are missed. A partial blowout that leaves water in one zone causes the same damage as no blowout at all.
- Liability: Reputable companies guarantee their work. If your system suffers freeze damage after a professional blowout, they cover the repair costs.
When DIY Makes Sense
If you already own or have access to an 80+ CFM compressor, have a small system (4 zones or fewer), and understand your pipe material and pressure limits, a DIY blowout is feasible. Just be certain you blow each zone at least twice and properly drain the backflow preventer.
Colorado Springs Winterization Timeline
| Date | Action | Notes |
|---|---|---|
| October 1 | CSPU watering restrictions end | Last day of mandatory watering schedules |
| October 1-10 | Schedule blowout appointment | Book early — late October slots fill fast |
| October 10-25 | Ideal blowout window | Before first hard freeze, after last needed watering |
| October 15 - Nov 1 | First hard freeze (historical average) | Temps below 28F for 4+ hours |
| November | Emergency blowouts only | Higher risk, limited availability, may cost more |
Spring Startup: When to Turn Your System Back On
The flip side of winterization is spring startup. Colorado Springs homeowners should wait until early to mid-May before reactivating their irrigation systems. The average last frost date for Colorado Springs is May 10, and late spring freezes through mid-May are common — even after weeks of warm weather.
A proper spring startup includes:
- Slowly pressurize the system: Open the water supply valve gradually (quarter turn, wait 30 seconds, repeat) to prevent water hammer that can crack pipes weakened by winter.
- Inspect the backflow preventer: Check for visible cracks, leaks at test ports, and proper operation before running any zones.
- Run each zone manually: Walk each zone while it runs, checking for broken heads, crooked spray patterns, sunken risers, and obvious leaks.
- Check controller programming: Verify watering days match current CSPU watering restrictions (typically 3 days per week starting May 1).
- Adjust head positions: Winter frost heave often tilts heads out of alignment. Straighten and level any heads that are spraying onto sidewalks, driveways, or structures.
Signs of Freeze Damage to Watch For
Sometimes freeze damage is not immediately obvious at spring startup. Watch for these signs in the weeks after reactivating your system:
- Unexplained soggy spots: A wet area in your yard when no zone is running indicates an underground pipe crack or fitting failure.
- Reduced pressure on specific zones: If one zone has noticeably lower pressure than others, water is escaping through a crack before reaching all the heads.
- Water bill spike: A higher-than-normal water bill after startup suggests a hidden leak — potentially a cracked mainline running 24/7 even when zones are not active.
- Backflow preventer leaking: Water dripping from the body, test cocks, or relief valve when the system is pressurized but no zones are running.
- Heads not popping up: Cracked riser fittings or swing joints prevent proper head extension. The head may dribble water at ground level instead of popping up and spraying normally.
Protecting Your Investment Year-Round
Beyond the annual blowout, there are steps you can take to minimize freeze risk and extend the life of your irrigation system in Colorado Springs:
- Insulate exposed pipes: Any above-ground piping (common near the backflow preventer) should be wrapped with foam insulation tape.
- Install a backflow cover: Insulated backflow preventer covers ($30-$60) protect the most vulnerable and expensive component from extreme cold and wind chill.
- Maintain proper drainage slope: Ensure all lateral pipes maintain a slight downhill slope toward drain points. Flat or uphill sections trap water that cannot drain by gravity.
- Consider drip irrigation for beds: Landscape beds with drip irrigation are easier to winterize than spray zones because the low-volume tubing drains more completely.
Schedule Your Sprinkler Winterization
CN Landscaping provides professional irrigation winterization and blowout services throughout Colorado Springs, Monument, Fountain, Falcon, and the surrounding area. We use commercial-grade compressors sized for residential and commercial systems, and every blowout includes backflow preventer service, controller check, and a spring startup reminder when the time comes.
If you are reading this in spring or summer and your system shows signs of freeze damage from last winter, we also handle irrigation repairs — from single head replacements to full main line rerouting. For homes with new sod that needs reliable irrigation coverage, properly winterized systems are critical to protecting your lawn investment.
Call (719) 460-5685 or request service online to schedule your sprinkler blowout or spring startup.