When (and How) to Winterize Your Sprinklers in Reno

Target the first two weeks of October. That is the safe window for most Reno and Sparks properties before the valley's first hard freeze, which historically lands between October 10 and October 25 at roughly 4,400 feet elevation.

If you wait until November, you are gambling. Reno sits in USDA hardiness zone 6b/7a, and nighttime temps can drop below 28°F with little warning. Water left in lateral lines, heads, and backflow preventers expands when it freezes. PVC fittings crack. Backflow preventers split. A single freeze event can turn a $110 blowout into a $400-plus repair job.

If you are on TMWA water, you also need to shut off your controller and pull back your schedule before the watering ban period kicks in for winter. Getting ahead of that deadline is one less thing to manage.

A proper winterization is not just turning off the timer. A technician shuts off the water supply to the irrigation system, then uses a commercial air compressor to blow compressed air through each zone in sequence. The goal is to push every drop of standing water out through the heads before the compressor is removed and the heads seat back down.

Each zone gets run separately, usually 2-3 passes, because the volume of air needed to clear a rotor zone is different from a drip or spray zone. The backflow preventer is drained and its test cocks are left at 45 degrees so any residual moisture can escape rather than sitting trapped inside the body. The controller is switched to the off or rain-delay setting, not just the schedule cleared.

At ShieldMePM, our winterization blowout is $110 flat. That covers most residential systems in Reno and Sparks. We schedule from late September through mid-October so you are not racing the first freeze.

Reno's high-desert weather is not gradual. Temperatures can drop 40 degrees in a day during October. The clay and caliche soil common across the Truckee Meadows holds cold well once it gets there, which means a pipe buried just a few inches below grade in a shallow trench has very little insulation protecting it.

The valley floor gets about 22 inches of snow per year on average, but the cold that matters for irrigation happens before the snow flies. Clear October nights with low humidity cool fast. A 6b zone means your area routinely sees winter lows in the 0-10°F range, and even a brief dip to 28°F is enough to crack a zone valve or backflow preventer that still has water in it.

Irrigation lines in older Reno neighborhoods — particularly in southeast Reno, Sparks industrial areas, and some South Meadows subdivisions — are often shallower than current code. Those systems are at higher risk and benefit from early scheduling.

Come spring startup, there are clear signs a blowout was incomplete or skipped. Heads that crack or break apart when the system first pressurizes, zone valves that leak at the solenoid, and backflow preventers that spit water from the side are the most common. A zone that runs weak and never builds pressure usually points to a cracked lateral line underground.

Repairs like these add up fast. A single broken backflow preventer runs $150-$300 to replace depending on size and location. Zone valve repairs are typically $75-$150 per valve. Lateral line repairs require digging, which adds time and cost.

If you moved into a home and are not sure whether the previous owner winterized the system, a spring startup check is the right first step. We offer seasonal start-up service for $99, which includes pressurizing each zone, checking heads and coverage, and flagging anything that needs attention before you run the system through the summer.

Winterization and spring startup work as a pair. After winter, the system needs to be repressurized slowly, zone by zone, to check for damage before you flood the whole system at once. A technician opens the water supply gradually, watches for leaks at the backflow preventer and valve manifold, then walks each zone while it runs to check head height, spray pattern, and coverage gaps.

In Reno, most homeowners schedule spring startup between mid-March and mid-April depending on when they want to begin watering. TMWA's 3-day even/odd schedule and the no-water window from 11am to 7pm should already be programmed into your controller at this point. A startup visit is a good time to confirm those settings are correct and update run times after any head replacements over winter.

ShieldMePM's spring startup is $99 and pairs naturally with our irrigation maintenance offerings through the season.

Winterization and startup are seasonal bookends, but irrigation issues come up all summer too. A head gets clipped by a mower, a lateral line develops a slow leak, a zone valve sticks open. Catching these early keeps your water bill in check and protects Reno's water supply under TMWA's conservation guidelines.

ShieldMePM handles irrigation service and repairs year-round for Reno and Sparks properties. We are not a landscape design or installation company, so we do not build new systems from scratch, but we maintain, repair, and seasonally service existing systems. If a head is broken, a valve needs replacing, or your coverage has gaps after years of settling, that is what we do.

Members on our Complete ($169/mo) and Premier ($279/mo) maintenance plans get priority scheduling for irrigation calls during the busy spring and fall windows when everyone is trying to book at the same time.

The simplest way is to call or text (775) 200-9710. We serve Reno, Sparks, and the broader Truckee Meadows area. Blowouts are $110 flat for most residential systems. If your system is unusually large or has more zones than average, we will tell you upfront before we schedule.

We recommend booking in September for an early to mid-October appointment. Once the first freeze advisory comes out, our schedule fills in 24-48 hours. Getting on the calendar early means you pick your preferred date rather than whatever we have left.

You will get a text when we are on the way and a note when the job is done. No surprise charges, no invoice you have to chase down. That is how we work across all of our services — straightforward, predictable, and easy to reach.