Maryland Pool Closing Cost

How to Winterize an Above-Ground Pool

Winterizing an above-ground pool protects the liner, walls, plumbing, and equipment from freezing temperatures. The exact steps depend on your pool model, equipment, plumbing layout, cover type, and local climate, so always check your manufacturer's instructions first.

Before You Start

Winterization procedures vary by pool brand, equipment model, and cover type. Before closing your pool:

  • Review your pool and equipment owner's manuals.
  • Confirm the recommended water level for your cover and pool design.
  • Gather winterizing chemicals, a cover, water bags or cover anchors, plugs, and basic hand tools.
  • Choose a calm, dry day to work so debris does not blow back into the pool.

Can I Winterize My Above-Ground Pool Myself?

Many above-ground pool owners can handle a basic DIY closing. The process is usually simpler than an in-ground closing because there is less buried plumbing and fewer returns to blow out.

That said, professional closing may make sense if you are uncomfortable working with pumps, filters, plumbing, or chemicals, or if your pool has a heater, attached spa, water feature, or complex equipment. A professional can also help ensure the cover is tight enough to survive winter weather.

Step-by-Step Winterization Guide

  1. 1. Clean the pool thoroughly

    Skim the surface, brush the walls and floor, and vacuum out leaves and debris. Closing a dirty pool can lead to staining, algae, and a much harder opening in the spring.

  2. 2. Balance the water before closing

    Test and adjust pH, alkalinity, and sanitizer levels. Well-balanced water is less likely to corrode equipment or scale surfaces over the winter. Follow your test kit or pool-store recommendations for target ranges.

  3. 3. Lower the water to the right level

    The correct water level depends on your pool and cover. Many above-ground pools are lowered to just below the skimmer or return openings so water cannot freeze and expand inside the plumbing. Some covers require more or less water to sit properly. Check your cover and pool manufacturer's instructions for the exact level.

  4. 4. Clean and prepare the filter

    Backwash or clean the filter according to its type (sand, cartridge, or DE). Drain the filter tank and remove or drain any small parts that could hold water and crack when frozen. Store removable parts somewhere dry.

  5. 5. Disconnect and winterize the pump and equipment

    Turn off power at the breaker. Drain the pump, heater, chlorinator, and any other equipment. Remove drain plugs and store them in the pump basket so you do not lose them. If you have a heater or salt system, follow the manufacturer's winterization steps carefully.

  6. 6. Blow out or winterize the plumbing

    For simple above-ground setups, you can often drain the hoses and equipment without compressed air. If your pool has underground plumbing, a heater loop, or multiple returns, blowing out the lines with a shop vacuum or compressor may be necessary. When in doubt, ask a professional.

  7. 7. Add winterizing chemicals

    Add a winterizing algaecide and any other closing chemicals recommended for your pool size and climate. Do not over-chlorinate right before covering, because strong chemicals can damage the cover or liner over months of contact. Follow the product label and your pool professional's advice.

  8. 8. Remove and store accessories

    Remove ladders, handrails, skimmer baskets, return fittings, and any toys or cleaners. Clean them, let them dry, and store them indoors to prevent cracking and fading.

  9. 9. Install and secure the winter cover

    Spread the cover evenly over the pool and pull it tight so water and debris slide off. Use a cover cable and winch, water bags, or anchor straps as your cover requires. A loose or sagging cover can collect rainwater and leaves, which strains the cover and can dump debris into the pool when it is removed.

Why procedures vary

Exact winterization steps differ depending on your pool shape, liner type, pump and filter model, whether you have a heater or salt system, how your plumbing is configured, and the type of cover you use. Use this guide as a general overview, but defer to your manufacturer's instructions for the final word.

How Much Does Professional Pool Winterization Cost?

Professional above-ground pool closing prices vary by location, pool size and configuration, cover type, equipment, and any add-ons such as spas, water features, or multiple pumps. In Maryland, published prices for a complete above-ground closing typically fall in the mid-hundreds, but your actual quote may be higher or lower depending on what the service includes.

Want to know what a professional pool closing could cost?

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Frequently Asked Questions

Do you drain an above-ground pool for winter?
You generally do not fully drain an above-ground pool for winter. Most owners lower the water only enough to protect the skimmer, returns, and plumbing. Draining the pool completely can damage the liner and walls. Follow your manufacturer's recommended water level.
How low should the water be for winter?
The right level depends on your pool and cover. A common guideline is to lower the water a few inches below the skimmer and returns, but some covers need the water higher to support the cover. Check your pool and cover instructions.
Do I need to add winterizing chemicals?
Yes, most pools benefit from a winterizing algaecide and a balanced closing chemical treatment. The exact products and amounts depend on your water volume, climate, and current water chemistry. Follow product labels or your pool professional's recommendations.
Should I cover an above-ground pool for winter?
Yes. A properly fitted winter cover keeps out leaves and debris, reduces algae growth, and helps protect the pool structure. Make sure the cover is tight and secured according to the manufacturer's instructions.
Can I leave my above-ground pool up all winter?
Above-ground pools are designed to be left up year-round in most climates, provided they are properly winterized and covered. In areas with heavy snow or very cold temperatures, regular cover maintenance and prompt snow removal can help protect the pool. Check your pool's documentation for climate-specific guidance.

Compare local pool-closing prices

Pool Projection collects publicly available pricing from Maryland pool companies so you can compare current local prices and understand what a professional closing might cost before you call. Use the Maryland pool closing cost estimator to see prices based on your county, pool type, cover, and features.