Whether your pool is in West Chester, Kennett Square, or out toward the Delaware beaches in Rehoboth, one thing is true across our whole service area: winter is coming, and your pool needs to be ready before it does. Pool closing in Chester County, PA and the surrounding region is about beating the first hard freeze—because water left in your plumbing when it freezes will crack pipes and ruin equipment. Here’s how to close your pool the right way this fall.
Timing: when to close in PA and DE
Aim for mid-to-late October across most of our area. The number that matters is water temperature—close once it holds below 60°F, which is when algae goes dormant and your water will stay clean under the cover all winter. Close too early in a warm September and you’re inviting algae; wait too long and an early freeze can damage your lines before you’ve started.
One local note: if you’ve got a shore property down in Rehoboth or Lewes, coastal air stays a touch milder into the fall than it does inland around Downingtown or Lancaster—but not enough to skip freeze protection. Close on schedule either way.
The closing process, step by step
Balance the water a few days ahead: pH 7.2–7.6, alkalinity 80–120 ppm, calcium hardness in range. This protects your surfaces over the winter.
Deep-clean the pool—skim, brush, vacuum. Chester County’s tree cover drops plenty of leaves, and anything left behind stains and feeds algae.
Shock and add algaecide. Shock the pool, let chlorine settle, then add a winter algaecide as your insurance against a green spring.
Lower the water below the skimmer and returns.
Blow out the lines. Clear every line with a compressor or shop vac, plug them with winterizing plugs, and add non-toxic pool antifreeze where you can’t fully clear them. Completely drain the pump, filter, and heater, and pull the drain plugs.
Cover it tightly with a safety or winter cover, and keep leaves and standing water off it through the season.
Second homes and rentals: don’t leave it to chance
A lot of our Delaware-shore customers own their pools as second homes or seasonal rentals, and those are exactly the pools that get forgotten until it’s too late. If you won’t be checking on the property through the winter, a professionally closed pool with a secure cover is cheap insurance against coming back in spring to cracked plumbing and a swamp.
The one step you can’t skip
If there’s a single takeaway, it’s the blow-out. Cracked underground lines are the most expensive spring repair we see, and they almost always come from water left sitting in the plumbing over a freeze. Do that step thoroughly—or let us handle it.
Get ahead of the freeze
DS Pool Services closes pools across Chester County and down into Delaware—West Chester, Kennett Square, Downingtown, Exton, and out to the shore. Book your fall closing early; our October calendar fills quickly. Reach out and we’ll get your pool safely put to bed for winter.