Spring Sprinkler System Startup Checklist for NJ Homeowners

After a South Jersey winter, your irrigation system needs more than just turning a valve. A proper spring startup — done right — will catch problems before your lawn pays for them. Here’s exactly what should happen when your system comes back online each spring, and what to watch for in Ocean County’s specific conditions.

When to Start Up Your Sprinkler System in Ocean County NJ

In Southern Ocean County, the safe window for spring startup is typically mid-April through early May. You want overnight temperatures to be consistently above 32°F before you introduce water back into your system. We’ve seen late freezes in Forked River as late as mid-April, so don’t rush it — one freeze after startup can undo all the protection your fall blowout provided.

A good rule of thumb: when the forsythia stops blooming and overnight lows are reliably above 35°F, you’re in the clear.

Spring Sprinkler Startup Checklist

1. Inspect the Backflow Preventer

This is the most important and most overlooked step. Your backflow preventer (typically a Febco or Watts unit) sits above ground and is vulnerable to freeze damage even when the rest of the system is protected. Look for: cracks in the body, split fittings, or any signs of leaking around the test cocks. If it cracked over winter, you’ll want to replace it before pressurizing the system.

2. Slowly Reintroduce Water Pressure

Do not just open the main valve all the way at once. Open it slowly — a quarter turn, then pause, then another quarter turn — to gradually pressurize the system. A sudden pressure surge (called water hammer) can blow fittings, crack pipes, or damage valve solenoids. Take 30–60 seconds to fully open the main supply.

3. Check Each Zone Manually

Run each zone manually from the controller and walk the zone while it’s running. Look for:

• Broken or cracked heads — Lawn mowers and snow plows are the #1 cause. A cracked head sprays sideways or geysers up instead of rotating properly.
• Heads that don’t pop up — Could be a clogged filter screen, broken riser, or stuck mechanism from winter debris.
• Dry spots — If one area of the lawn isn’t getting covered, a head may be misaligned, clogged, or damaged.
• Soft, soggy ground near a valve box — Possible sign of an underground leak or cracked pipe from freeze damage.
• Valve that won’t shut off — Debris in the diaphragm is common in spring; may need cleaning or replacement.

4. Clean and Adjust Nozzle Filters

Each rotor and spray head has a small filter screen. Over winter, sand and sediment can settle in the lines. Pull a few heads in each zone and check the filters — rinse them clean if needed. This is especially important in South Jersey where sandy soil can introduce grit into the system.

5. Check and Adjust Head Arc and Radius

Heads can get knocked out of alignment over the winter — especially in areas where the ground heaves or settles. Make sure each head is spraying in the right direction and covering its intended area. Rotors are adjustable with a flat-head screwdriver; spray heads use a pull-and-turn nozzle adjustment.

6. Update Your Controller Schedule

Don’t just use last year’s schedule. Spring watering needs are different from summer. Start with 2–3 days per week, early morning (5–7am), and adjust based on rainfall and how the lawn responds. If you have a smart controller, update the seasonal adjustment setting or run a new weather-based calibration.

7. Check the Rain Sensor

Your rain sensor (if you have one) may have debris or a stuck disc from the winter. Test it by simulating rain with a garden hose — the system should shut off within a few seconds of the sensor getting wet. If it doesn’t, the sensor likely needs cleaning or replacement.

Common Spring Problems We See in Ocean County

After 35+ years of spring startups in Southern Ocean County, we see the same issues every year:

• Cracked backflow preventers — Happens when the system isn’t fully blown out in fall, or when an early winter storm catches homeowners off guard
• Broken heads near driveways — Snowplow damage is extremely common along the Shore corridor
• Controller that won’t come on — Battery backup died over winter; replace the backup battery first
• Sandy heads in Zones near wooded areas — Leaves and debris clog filters over the off-season

Let Us Handle Your Spring Startup

A professional spring startup takes about an hour and catches problems before they become expensive. We test every zone, inspect the backflow, and make minor adjustments while we’re on-site. Call (609) 971-9044 to schedule — we book up fast in April and May.

All Systems Sprinklers — Forked River, NJ. Serving Ocean County since 1989. NJ LIC# 17791.