Everything You Need to Know About Winterizing Your Above Ground Swimming Pool
While it’s fun to live it up splashing around and enjoying your pool with family and friends, that time sadly comes to an end each year for the majority of swimming pool owners.
The long, warm days fade and get replaced with colder temperatures, falling leaves, and eventually, snow and ice. When fall comes around, and your pool water is consistently below 65 degrees, it’s time to close up shop for the year.
Understanding how to properly winterize your above ground swimming pool is essential. It helps prevent costly damage and greatly reduces the time it takes to open your pool in the spring.
Follow the below steps to winterize your above ground pool and close it for the season.
What You’ll Need to Winterize Your Pool:
- Winter pool cover
- Test strips
- Pool vacuum
- Equipment instruction manuals
- Scrubber/scrub brush
- Winterizing chemical kit - recommended
- Winter pillow(s) - recommended
Steps to Winterize Your Pool
Once you’ve gathered the supplies, it’s time to start the process of closing your pool for the winter.
1. Test and balance the water.
Several days before you close your pool for the season, you’ll want to test your water. Making sure your water is at the proper levels will help you avoid buildup, corrosion, and other damage to your pool and make opening your pool easier come spring.
When closing your pool for the winter, make sure your pool levels are as follows:
- pH between 7.2 and 7.6.
- Alkalinity between 100 and 15 ppm.
- Calcium hardness between 175 and 250 ppm.
- Chlorine between 1 and 3 ppm.
2. Clean your pool.
To avoid any nasty surprises come spring, you’ll also want to make sure your pool is as clean as possible before closing it up for the winter season. The cleaner, the better!
Start by cleaning up leaves, rocks, and debris around your pool that may end up in the water or present a tripping hazard.
After that, you’ll want to tackle cleaning the pool itself. Scrub your pool to remove any dirt and debris from your liner, then vacuum it thoroughly.
The busy pool season can take a toll on your liner. As you’re cleaning your pool, check your pool liner for signs of leaks or damage before going through the winterization process. If you notice any issues, you should repair or replace your liner before moving forward.
While you're at it, it's also a good time to clean off your patio area as well.
For more helpful tips for cleaning your pool, you can check out these resources:
- 9 Easy Pool Liner Cleaning Tips Every Owner Should Follow
- How to Sanitize your Pool, Patio, and Pool Accessories
Note: The end of the season is a great time to have your pool professionally cleaned if you haven’t done so throughout the warm season. Professionals have the equipment and expertise that can get your swimming pool as clean as possible and help you spot any issues before closing it up for the season.
3. Add winter chemicals.
After your pool is thoroughly cleaned, it’s time to add the winter chemicals to the water. We recommend a winterizing chemical kit, which is a convenient way to get all of the chemicals you need for closing your pool all at once.
The ideal winter chemical kit contains a winterizing algaecide and chlorine or non-chlorine shock. It is also recommended to use a winterizing kit that comes with a metal control if you have a heater or use well water.
Once you have your kit, be sure to read and follow the instructions. Oftentimes, larger pools require additional algaecide or pool shock, which can be purchased separately as needed.
If you don’t opt for a winterizing kit, you should purchase the shock and algaecide recommended for your pool size. Follow the instructions on the back of the bottle and add it to your pool.
You can use either standard or fast-dissolving shock. When using standard shock, add it to the pool the night before you want to close it for best results.
Pro tip: Don’t add algaecide and shock at the same time. The chlorine can oftentimes prevent the algaecide from working properly.
4. Winterize your pool pump and filter.
To winterize your pump, remove all drain plugs and hoses. Be sure to review and follow the instructions in your owner’s manual for your specific product.
Once removed, place all drain plugs in a pump basket for storage so they’re all together and don’t get lost in the shuffle.
Next, you have to winterize your filter. How to do this depends on what type of pool filter you have.
If you have a sand filter:
- Set your multiport valve to winterize.
- Let the filter completely drain out.
- If necessary, remove the bleeder valve and sight glass.
- Backwash your sand filter.
- Drain the filter.
- Spray with cleaner.
- Rinse with a hose.
- Leave the valves open.
Plug the returns and any other outlets, and then remove all hoses from the filter, return, and skimmer. Once your filter and pump system are clean and disconnected, you should store your equipment indoors.
5. Lower the water level.
Next, lower the water level to approximately 4 to 6 inches below the skimmer. Be careful during this process.
Pools that are drained down too low can cause a lot of undue stress on the pool cover and liner, shortening their lifespan and costing you money.
Note: It’s very rare that you should ever need to completely drain your above ground pool. Doing so can cause damage to your liner. If you need to completely drain your pool, consult a professional.
6. Remove, clean, and store removable parts and equipment.
Now, it’s time to take care of all those extra pool parts and accessories. Take time to remove all non-permanent pool parts, such as ladders, pool stairs, floats and toys, etc.
Rinse all these items off with a hose and use bleach or a non-chemical cleaner (like vinegar) to remove dirt, debris, and bacteria. Let them dry completely before putting them in storage to prevent mold, mildew, and rust.
You can learn more by reading our tips for cleaning swimming pool toys and floats.
As you’re putting all your parts, accessories, and equipment away, check for any signs of damage. That way, you can repair it or make a note that it needs to be replaced and avoid any surprises when opening your pool next season.
Oftentimes, if something needs to be replaced, you can score good deals at the end of the outdoor pool season.
7. Inflate and place an air pillow.
Air pillows help protect your pool by evenly distributing the water that collects on your winter cover and pushing it toward the edge of the pool, making it easier to remove. It also causes ice to crack, which helps relieve pressure on your pool and prevents structural damage
For peak effectiveness, the pillow should be placed in the middle of the pool. Depending on the size of your pool, you may need multiple pillows. If so, tie them together using the grommets on the corners.
8. Put on the winter cover.
Once the winter pillow is in place, you can put your winter pool cover over the top of your pool.
Here’s how to put a winter cover on an above ground pool:
- Place the cover on the pool. Make sure it is centered over the air pillow and even on all sides. You may need a friend or family member’s help here.
- Secure the cover. Once it is in place, secure it by using a cable and winch, water bags, or a combination of winter cover clips and a cable. The cover should be tight and not sag. Avoid using heavy weights like concrete blocks and bricks. They could cause damage to your cover or your pool.
After the cover is secured, you may want to run a winterizing cover wrap around your pool to seal it and prevent the cover from moving, flapping, or coming off.
9. Check your pool regularly.
Your pool should now be set for the winter. However, you should remove snow and debris from your cover and check in on your pool regularly throughout the cold season.
Checking in on your pool will help you spot any issues or damage before it’s too late. Look for common winter problems like:
- Cracks and indentations in your pool’s walls (from ice expansion)
- Ice build-up inside your swimming pool
- Holes in your winter pool cover
- Cracked or broken equipment (often caused by freezing)
- Algae buildup
Get Set For Winter
If you have questions, contact us to make sure your pool and vinyl pool liner are in top shape all winter season long and ready to open in the spring!
Of course, be sure to browse around for all of your winter pool care needs.
Other Winter Pool FAQs
Here are a few other common pool closing questions we typically get.
When do I winterize my above ground pool?
We recommend winterizing your pool when temperatures regularly drop below 65 degrees Fahrenheit.
Do I need to winterize my pool?
Whether or not you need to winterize your pool depends on your location and the climate in your area. Winterizing a pool is typically necessary if you live in a region with cold winters to protect it from freezing temperatures, ice, and snow.
How do you store pool floats for winter?
Follow these simple steps to properly store your floats.
- Clean them thoroughly using a mix of vinegar and water or a non-abrasive dish soap and rag.
- Let them dry completely.
- Repair or replace any damaged floats.
- Deflate any inflatable floats.
- Fold or roll them up neatly.
- Store in a pest- and moisture-resistant bin away from direct sunlight/UV rays.
It’s always a good idea to check on the floats a few times throughout the winter, just to be sure no pests or moisture has found its way into the box.
Are pools cheaper in the winter?
Sometimes. Many pool and pool accessory manufacturers, like Linerworld, offer great deals on pools, liners, floats, and more during the off-season. This is a great opportunity to stock up and avoid potential delays or out-of-stock items when the spring or summer season arrives.
What else should I do to prepare my pool for the winter?
We find that the colder months are a great time to get yourself organized and prep for the summer.
That way, when it starts to heat up, you can maximize your time in the pool rather than searching for instruction manuals, looking for games and floats, or fixing broken accessories. Check out our guide for organizing your pool and accessories during the winter.