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Pool Closing Checklist: Protecting Your Investment Over Winter

Closing your pool properly is one of the most important steps in protecting your investment through a New Jersey winter. Freezing temperatures can cause significant damage if water is left in plumbing lines, equipment isn’t winterized, or chemical balance is ignored. A correct closing process ensures your pool remains protected from freeze damage, algae growth, and costly repairs when spring arrives.

The process follows a specific sequence: balance the water chemistry, lower the water level below the skimmer, blow out plumbing lines, add antifreeze, winterize equipment, and install a secure cover. Each step plays a critical role. For example, failing to remove water from lines can lead to cracking, while improper chemistry can result in algae blooms and staining that are difficult to correct later.

The best time to close your pool is early to mid-fall, before temperatures consistently drop below freezing. Skipping or rushing any part of the closing process often leads to expensive problems in the spring—green water, damaged pipes, broken equipment, or extended opening timelines. Taking the time to close your pool properly ensures an easier, cleaner, and more cost-effective start to the next season.

Step-by-Step Guide

1. Balance Water Chemistry

  • Adjust pH, alkalinity, and chlorine levels

  • Add winterizing chemicals as recommended

  • Prevents algae growth and staining

2. Lower Water Level

  • Drain water below the skimmer and return lines

  • Prevents freezing damage in key components

  • Follow manufacturer recommendations

3. Blow Out Plumbing Lines

  • Use compressed air to remove all water from lines

  • Clear skimmer, return, and main drain lines

  • Critical step to prevent pipe damage

4. Add Antifreeze to Lines

  • Add pool-safe antifreeze to plumbing lines

  • Provides extra protection against residual water

  • Do not use automotive antifreeze

5. Winterize Pump and Filter

  • Drain all water from pump, filter, and heater

  • Remove drain plugs and store them safely

  • Prevents cracking from freezing

6. Remove and Store Accessories

  • Take out ladders, handrails, and fittings

  • Clean and store in a dry location

  • Protects equipment from weather damage

7. Install Pool Cover

  • Securely fasten winter cover

  • Keep debris out and maintain safety

  • Use cover pumps if needed to remove water buildup

 

Tools & Materials

Everything you'll need to complete this project.

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Pool winterizing chemical kit

A closing kit includes algaecide, shock, and stain preventer sized for your pool. Using a quality closing kit prevents the green swamp you'd otherwise face in spring.

AmazonLowe'sHome Depot

Pool winter cover

A solid safety cover with water bag anchoring is the safest option and keeps the most debris out. Mesh covers let rain through (less pumping) but allow some debris.

AmazonLowe'sHome Depot

Water bags / cover clips

Water bag anchors hold solid pool covers in place against NJ wind. Fill them 80% full (100% freezes and bursts). Clip anchors work for solid covers with grommet edges.

AmazonLowe'sHome Depot

When to Call a Pro

For most homeowners, especially those with in-ground pools, it’s best to call a professional for closing. The blowout process requires specialized equipment and precise technique to avoid damaging plumbing lines. Professionals also ensure proper chemical balance, equipment winterization, and secure cover installation—reducing the risk of costly issues when reopening in spring.

Find a Pool Professional

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Related Guides

Pool Opening Checklist: Step-by-Step for NJ Homeowners

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Pool Chemistry Basics: A Homeowner's Guide

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Frequently Asked Questions

When should I close my pool in NJ?

Typically in early to mid-fall, before consistent freezing temperatures begin.

Can I skip antifreeze if I blow out the lines?

Antifreeze provides an extra layer of protection in case any water remains, so it’s strongly recommended.

What happens if I don’t close my pool properly?

You may face cracked pipes, equipment damage, algae growth, and expensive repairs in the spring.

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