Closing the Pool for Winter: The Routine That Saves Your Spring

The first fall I owned a pool, I half-closed it — threw a cover on, walked away, and figured I'd deal with the rest later. Spring greeted me with green water, a cracked filter housing, and a repair bill that stung. The pool had pleasure-money sunk into it, and I'd let a few skipped steps undo that. Now I run the same closing routine every autumn, and opening day is boring in the best way.

As summer winds down, the goal is to get the pool through the cold months without freeze damage and ready to swim the second the weather turns. Here's the sequence that works for me.

Balance the water before anything else

Closing chemistry matters more than people think, because whatever's in the water sits there for months. I test and balance first. The pH should land around 7.5 — if it's high, I bring it down with dry acid. I also check and adjust the chlorine, and add a pool winterizing kit dose designed to keep algae from taking hold over winter. Water that's balanced going in is water that opens clear; water that's off becomes a science experiment by March. A simple pool test strips pack makes the testing a two-minute job.

Run the pump, seal leaks, and lower the water

As the cold sets in, I run the pump about six hours a day for the last stretch before closing — moving water resists algae while the pool's still active. I check for and seal any leaks I find, because a slow leak becomes a real problem once it freezes.

Then I lower the water. I close the skimmer valve and drain until the level sits roughly six inches below the bottom of the skimmer — that's the sweet spot that keeps water out of the skimmer where it could freeze and crack. A small submersible pump makes the drawdown quick and lets me dial in the exact level instead of guessing with a garden hose siphon.

Swap the cover and keep it tight

If I used a summer cover, I clean it — a pressure washer or just fresh water and a scrub — dry it fully, and store it somewhere dry so it's ready next year. Then on goes the winter pool cover. The key is tension: I pull it taut enough that nothing can get underneath once it's seated, and I check it a couple of times a week through the season to make sure it's still tight. A loose cover lets in debris, water, and trouble.

I also tell everyone in the house — and I mean everyone, pets included — to stay off the cover and away from the pool. A winter cover protects the water; it is not designed to hold a person or an animal that slips onto it. That's a safety line, not a suggestion. A few cover anchors or water bags around the edge keep it pinned down through wind and snow.

Drain the equipment — don't skip this

This is the step that saves your hardware. Any water left in the pump, heater, or filter will freeze, expand, and crack the housings — permanent, expensive damage. So I drain all of it. Most units have a drain plug at the bottom; pull it and let them empty completely. It's the easiest part of the whole process and the one most likely to bite you if you forget. I keep a wet dry shop vac nearby to clear any stubborn water that won't gravity-drain out of the lines.

Check back through the season

Closing isn't quite "set it and forget it." A few days after I finish, I come back and look the whole thing over — is the cover still tight, is the water level holding, did anything shift? Catching a loose cover or a slow leak in November is trivial; discovering it in April, after the damage is done, is not. A quick walk-around every couple of weeks through winter is cheap insurance.

Store the accessories and label the chemicals

The last thing I do is deal with everything that doesn't live in the pool itself. Ladders, the diving board, return fittings, baskets, and the pool skimmer net all come out, get rinsed, and go into dry storage so a hard freeze can't crack them. Leaving plastic accessories out all winter is how they end up brittle and broken by spring.

I also tidy up the chemical shelf. I check expiration dates, make sure lids are sealed, and store everything somewhere cool, dry, and out of reach — pool chemicals don't love freezing temperatures or moisture either. Taking five minutes to note what I'm low on means I'm not scrambling to buy shock and chlorine the week everyone else opens their pool and the shelves are bare. A little organization in November makes opening day in spring almost effortless.

Done right, closing the pool takes an afternoon and a clear head. Balance the water, lower it below the skimmer, swap to a taut winter cover, drain every bit of equipment, and check in now and then. Do that, and spring is a quick uncover-and-swim instead of a green, cracked-up mess you dread.