You were so excited to open your pool when it finally got warm enough in New Jersey to do it. Now, the days are getting shorter, and the nights are getting longer. The air is beginning to feel cooler. The kids are going back to school. And, suddenly, you realize it’s time to start thinking about closing your pool for the winter. Do you need some information on how to close a pool that’s in the ground for the winter? We can give you the details to get you started. If you close a pool well, you won’t have much to do to get it ready in the spring.

Why Is Closing a Pool So Important?

You may have not given any thought to closing and winterizing your pool yet. It’s not even Labor Day, which is the traditional day most municipal pools close. However, if you don’t close your pool properly, you’ll regret it in the spring. Your pool will look more like a swamp. If you put in some effort now, you will use fewer chemicals and less manpower in the spring. Using fewer chemicals is cheaper for you and better for the environment. It’ll make your pool surfaces last longer as well.

It may be difficult to decide when to close your pool. When considering the best time to close an inground pool in NJ, you should think about closing it when the temperature stays below 60 degrees. At that temperature, algae and other organisms cannot form. The longer you leave your pool open, the less chance you will need to put a ton of chemicals in it.

Winterizing Your Pool

In New Jersey, temperatures can get to freezing and stay there for days. You may want to think about when to cover your pool. Having a winter cover means you’re protecting your pool from the elements and preventing children and/or animals from accidents. New Jersey is not Arizona or Florida, where it rarely freezes. You need to blow all the water out of your pool’s pump to prevent damage from ice or snow.


You will need to clean your pool thoroughly. Use a pool brush to scrub the walls and floor. You want to clean every surface. Use an algae brush if you suspect any kind of algae. After you have brushed, you need to vacuum. This will get all the debris you brushed off out of your pool.


After your pool has been thoroughly cleaned, you will need to test the water. This is very important. If the pool doesn’t have a balanced pH, you could have trouble. Staining, corrosion, or scale buildup are just a few of the problems of an unbalanced pool. Check that your chlorine level is lower than 5 million ppm. If your level is higher than that, it could affect your pH balance.

Add Winterizing Chemicals

You will probably have to shock the pool using a nonchlorine shock. After shocking the pool, add other winterizing chemicals. Depending on where you live, the chemicals could include an algaecide, metal sequestrant, pool enzymes, and a winter pill. The winter pill dissolves slowly and allows the chemicals to disperse over time.

Some people with pools in New Jersey add antifreeze to their water pumps. This prevents the lines from freezing no matter how cold it gets. If you aren’t sure you removed every drop of water from the lines, make sure you use antifreeze.

Don’t forget, once you’ve balanced the pool and drawn down your water, you need to put a winter cover on. There are lots of winter covers to choose from. Make sure your cover fits tightly to the pool. This protects your pool from debris sneaking in during the winter months.

Do you want to learn more about the best time to close an inground pool in NJ or if you need help winterizing your pool, contact Atlantic Pool and Spa. Our store is on Route 15 South in Lake Hopatcong, N.J. We have been servicing Morris County, Bergen County, Warren County, and Sussex County since 1996.