How to Prep Your Pool for Fall Closing

As summer winds down, it’s tempting to ignore your pool and focus on cooler weather. But properly closing your pool is one of the most important maintenance tasks of the year. It keeps your water in good condition, protects your equipment, and saves you from a massive headache when it's time to open again.

Why Fall Closing Matters

Leaving your pool untreated or uncovered through fall and winter can lead to algae growth, waterline stains, frozen pipes, and cracked equipment. A well-closed pool can survive the entire off-season with minimal issues.

When to Close Your Pool

Don’t rush to close your pool right after Labor Day. The ideal time is when the water temperature stays consistently below 65°F. At this point, algae activity slows down, and your chemicals will stay effective longer.

What to Gather Before Closing

Having everything ready before you begin makes the process easier and avoids any mid-task frustration.

Pool Closing Essentials:

• Pool skimmer net and vacuum

• Pool brush

• Water test kit or test strips

• Pool shock

• Algaecide (non-copper-based preferred)

• pH and alkalinity balancers

• Winterizing kit or antifreeze (for colder climates)

• Winter pool cover

• Cover weights, clips, or water bags

• Winter plugs and gizmos

Step-by-Step Fall Pool Closing Guide

1. Clean the Pool Thoroughly

Skim off all leaves and debris. Brush the walls and floor to remove buildup. Vacuum the entire pool to avoid any organic matter sitting over the winter.

2. Test and Balance the Water

Make sure your pool water is balanced before adding closing chemicals. Adjust pH, alkalinity, and calcium hardness as needed. Balanced water helps prevent staining and corrosion.

3. Add Closing Chemicals

Shock the pool one last time and add algaecide to kill off anything left in the water. If using a winterizing kit, follow the included instructions carefully.

4. Lower the Water Level

Lower the water level below the skimmer and return lines, especially if your area freezes in winter. This helps prevent cracked pipes and fittings.

5. Drain Equipment and Lines

Drain your pump, filter, heater, and chlorinator. Blow out the lines with a shop vac or air compressor if needed. Plug the return and skimmer lines with winter plugs or gizmos.

6. Remove Accessories and Store Them

Take out ladders, diving boards, toys, and skimmer baskets. Store everything dry and safely indoors to prevent damage.

7. Cover the Pool Securely

Use a winter cover that fits your pool well. Add cover clips, weights, or water bags to keep it in place. Make sure no debris can sneak under the edges.

Mistakes to Avoid During Pool Closing

Closing Too Early

If you close the pool while the water is still too warm, you risk algae growing under the cover. Wait until the right temperature window.

Skipping the Clean-Up

Leaving leaves and dirt behind can stain the pool surface and feed algae over winter.

Not Winterizing Equipment

Failing to drain lines and equipment could result in cracked pipes and expensive spring repairs.

How to Check on Your Pool in Winter

Even after closing, check your pool every few weeks. Remove excess water from the cover, clear off any debris, and check that the cover is still secure. A little effort during the winter prevents surprises later.

You’re Ready for a Smooth Spring Start

Taking time now to prep your pool for fall closing saves you money, time, and stress when spring rolls around. Protect your pool investment and enjoy peace of mind all off-season.