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Lawn LandscapingIntermediate DIY1–2 hours

How to Open Your Sprinkler System for Spring

Bringing your sprinkler system back online after a New Jersey winter requires more than just turning the water back on. Improper startup—especially opening valves too quickly—can cause water hammer, a sudden pressure surge that can damage pipes, fittings, and sprinkler heads. The correct process involves slowly pressurizing the system, starting with the backflow preventer, to safely reintroduce water into the lines.

Once the system is pressurized, each irrigation zone should be tested individually. This allows you to identify issues like clogged nozzles, broken heads, or leaks before they worsen. Freeze-thaw cycles during winter can crack sprinkler heads or underground piping, and it’s important to distinguish between freeze-damaged components (often cracked or leaking) and worn heads (which may spray unevenly but aren’t leaking).

Spring is also the time to check your irrigation controller. Power outages over the winter may reset schedules, requiring reprogramming for proper watering times and seasonal adjustments. Skipping a proper startup can lead to wasted water, uneven lawn coverage, and hidden leaks that increase your water bill. Taking the time to open your system correctly ensures efficient operation throughout the growing season.

Step-by-Step Guide

1. Inspect the System Before Turning On Water

  • Walk the yard and check for visible damage

  • Look for cracked heads or exposed pipes

  • Ensure valves and fittings appear intact

2. Slowly Open the Main Water Valve

  • Gradually open the shutoff valve to prevent pressure shock

  • Avoid sudden bursts of water (prevents water hammer)

  • Listen for unusual noises or leaks

3. Open the Backflow Preventer

  • Slowly open valves on the backflow device

  • Ensure proper water flow without leaks

  • Critical step for safe pressurization

4. Test Each Zone Individually

  • Run each irrigation zone one at a time

  • Check for proper spray patterns and coverage

  • Identify leaks, low pressure, or clogged nozzles

5. Inspect Sprinkler Heads

  • Replace heads that are cracked or leaking (freeze damage)

  • Adjust or clean heads that spray unevenly (wear or clogging)

  • Ensure heads are level with the ground

6. Check for Leaks and Pressure Issues

  • Look for pooling water or soggy areas

  • Monitor for weak or inconsistent spray

  • Address issues early to avoid water waste

7. Reprogram the Irrigation Controller

  • Reset date and time if needed

  • Adjust watering schedule for spring conditions

  • Ensure zones run at appropriate durations

 

Tools & Materials

Everything you'll need to complete this project.

Affiliate disclosure: Hello Home Reminders may earn a small commission from purchases made through these links at no extra cost to you. This helps us keep our guides free and up to date.

Sprinkler head adjustment tool

A flat blade tool or manufacturer-specific key allows you to adjust arc and radius on pop-up heads without tools. Most brands use compatible tools.

AmazonLowe'sHome Depot

When to Call a Pro

If you notice significant leaks, broken underground pipes, low pressure across multiple zones, or issues with your backflow preventer, it’s best to call a professional. You should also seek expert help if your system wasn’t properly winterized or if startup reveals widespread damage. Irrigation specialists can safely pressurize the system, repair hidden issues, and optimize performance for the season.

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Frequently Asked Questions

Why do I need to open my sprinkler system slowly?

Opening valves slowly prevents water hammer, which can damage pipes, fittings, and sprinkler heads.

How can I tell if a sprinkler head is damaged by freezing?

Freeze-damaged heads often show cracks, leaks, or broken components, while worn heads usually just have uneven spray patterns.

Do I need to reset my sprinkler controller every spring?

Often yes. Power outages during winter can reset settings, so it’s important to check and reprogram your schedule.

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