Cold weather can damage your inground pool in ways that cost hundreds or thousands of dollars to fix. The key to winterizing inground pool correctly is starting the process before temperatures drop below 65°F and following the right steps to protect your equipment, plumbing, and pool structure.
We know that many pool owners put off winterizing until it’s almost too late. Pool professionals charge between $150 to $300 for this service, but you can do it yourself with the right knowledge and save money.
In this guide, we’ll walk you through everything from choosing the best winter cover to protecting your pipes with antifreeze. We’ll also share tips that make opening your pool next spring much easier, so you can enjoy crystal clear water when warm weather returns.
Here’s what you need to know:
- Why winterizing your inground pool matters more than you think
- The basics of winterizing an inground pool
- Choosing the right winter pool cover
- Protecting your pipes with antifreeze and more
- Planning ahead for easier spring openings
Keep reading! By the end, you’ll know how to winterize inground pool the right way, from water balancing and cover selection to antifreeze use and protecting lines before freezing temps hit.
Why winterizing your inground pool matters more than you think
Skipping proper pool closing leads to expensive pipe damage and equipment failures that cost thousands to repair. Winter pool damage from freezing temperatures affects your entire pool system in ways that go far beyond simple inconvenience.
What really happens if you skip winter prep
When we don’t close our pools properly, water left in the system becomes a major problem. Freezing temperatures turn that water into ice, which expands by about 9%.
This expansion creates massive pressure inside pipes and equipment. The force is strong enough to crack concrete and split metal components.
Common damage from skipped winterization includes:
- Cracked skimmer boxes
- Burst pool lights
- Damaged filter housings
- Split return lines
- Broken pump housings
Pool equipment like pumps and heaters suffer the most damage. Their internal chambers hold water that freezes solid. When ice forms, it pushes against walls that can’t stretch.
We also see problems with pool surfaces. Water that freezes in cracks makes them bigger. Small chips become large holes that need expensive repairs.
Algae growth becomes another issue. Pools left running all winter waste energy and chemicals. The water turns green and needs professional cleaning before we can use it again.
How freezing temps affect pipes and equipment
Pipes are the most vulnerable part of our pool systems during winter. Underground lines seem protected, but they still face risks from freezing temperatures.
When water freezes in pipes, it doesn’t just block flow. The ice pushes outward with incredible force. PVC pipes crack along their length. Metal pipes can burst at joints and fittings.
Most at-risk components:
- Skimmer lines
- Return jets
- Main drain connections
- Equipment pad plumbing
- Above-ground exposed pipes
Pumps face serious damage when water freezes inside their housing. The pump basket cracks first. Then the impeller housing splits open.
Pool heaters have complex internal water passages. Ice formation breaks heat exchangers and control valves. These repairs often cost more than buying new equipment.
Filter systems also suffer damage. Sand filters crack at the multiport valve. Cartridge filters split their housings. DE filters lose their internal grids.
We see the worst damage on equipment pads where pipes come above ground. These areas freeze first and thaw last.
The long-term cost of not closing your pool properly
The financial impact of winter damage adds up quickly. Professional pool closing costs between $150-300. Compare that to repair bills that reach thousands of dollars.
Average repair costs from freeze damage:
| Component | Repair Cost |
| Burst pipes | $500-1,500 |
| Cracked skimmer | $300-800 |
| Damaged pump | $400-1,200 |
| Broken heater | $800-3,000 |
| Pool surface repairs | $1,000-5,000 |
We also lose money on wasted chemicals and energy. Pools left running all winter use expensive electricity. Chemical costs multiply when we fight algae and bacteria growth.
Insurance companies often don’t cover freeze damage. They consider it preventable maintenance. This means we pay repair costs out of pocket.
Cost savings from proper winterization go beyond avoiding repairs. Our equipment lasts longer when protected from harsh conditions. Pumps and heaters that survive multiple winters without freeze damage work better and need fewer repairs overall.
Spring opening becomes much easier and cheaper. Properly closed pools need basic chemical balancing. Damaged pools require extensive cleaning and multiple repair visits before they’re ready to use.
The basics of winterizing an inground pool
Winterizing your inground pool involves balancing pool chemicals, lowering water levels, and protecting your pool equipment from freezing temperatures. The process requires specific supplies and timing based on your local climate conditions.
Step-by-step overview of the winterizing process
We follow a clear sequence when winterizing any inground pool. First, we balance the water chemistry by testing and adjusting pH, alkalinity, and chlorine levels.
Next, we lower the water level below the skimmer line. This prevents freeze damage to plumbing lines during winter months.
We then drain all pool equipment including pumps, filters, and heaters. Any remaining water can freeze and crack expensive components.
Chemical Treatment Steps:
- Add winterization chemicals
- Run circulation system for 24 hours
- Remove all accessories and toys
Finally, we install a winter cover to keep debris out. We secure it properly with water bags or safety straps depending on the cover type.
When to winterize based on your local climate
We recommend winterizing when daytime temperatures consistently stay below 65°F. This timing prevents algae growth while avoiding early closure.
Regional Guidelines:
- Northern climates: Mid to late October
- Mid-Atlantic regions: Early to mid November
- Southern areas: Late November to December
We never rush the winterization process. Closing too early wastes money on chemicals and shortens your swimming season.
Watch local weather forecasts for the first hard freeze. We complete winterization at least one week before temperatures drop to 32°F or below.
What supplies you need to winterize your inground pool
We use specific pool chemicals designed for winter closure. A winterization kit typically contains algaecide, shock treatment, and metal sequestrant.
Essential Chemical Supplies:
- Pool shock (chlorine-based)
- Winter algaecide
- pH and alkalinity balancers
- Antifreeze for plumbing lines
Equipment and Tools:
- Pool cover and securing hardware
- Drain plugs and winter plugs
- Basic safety gear including gloves
- Pool brush and vacuum
We also need tools to lower water levels and blow out plumbing lines. A shop vacuum or air compressor removes water from pipes and equipment.
Safety gear protects us during the chemical balancing process. We always wear gloves and eye protection when handling pool chemicals.
ENERGY STAR®-certified in-ground pool pumps use up to 18% less energy than standard pumps and can save hundreds of dollars over their lifetime, making efficient circulation during winter part of broader pool cost savings.
Choosing the right winter pool cover
A quality winter pool cover protects your pool from debris, reduces spring cleaning time, and prevents damage from freezing temperatures. The type of cover you choose and how you install it determines how well your pool survives winter.
The difference between in ground pool covers and temporary options
Safety covers are the gold standard for inground pools. These covers attach to your pool deck using cover anchors drilled into the concrete. They can support weight and provide security for children and pets.
Mesh covers allow water to pass through while blocking leaves and large debris. They’re lighter and easier to handle than solid options. We recommend mesh covers for areas with heavy rainfall or snow.
Solid covers block all water and debris from entering your pool. They require a cover pump to remove standing water throughout winter. Solid covers work best in moderate climates with less precipitation.
Temporary covers like tarps cost less but offer minimal protection. They don’t attach securely to your pool and can blow away in strong winds. These covers work only for short-term use.
What to look for in a durable winter pool cover
Look for covers made from reinforced polyethylene or vinyl materials. These materials resist tearing and UV damage. Covers should have a minimum 12-15 year warranty.
Check the thread count and material thickness. Higher thread counts mean stronger fabric. Covers should be at least 12 mil thick for solid covers and 14×14 mesh weave for mesh options.
Double-stitched seams prevent tears from spreading. Look for covers with reinforced stress points where straps and springs attach. Quality covers have brass or stainless steel grommets that won’t rust.
Proper sizing is critical. Measure your pool carefully and add 3-4 feet on all sides. Covers that are too small won’t anchor properly and leave your pool exposed.
According to the U.S. Department of Energy, covering a pool when it’s not in use is the single most effective way to reduce pool heating costs, savings of 50%–70% are possible from reduced evaporation and heat loss
Cover placement tips that protect your pool all season
Install your cover on a calm day when temperatures are above freezing. Clean your pool deck thoroughly before placing cover anchors. Mark anchor locations with chalk before drilling.
Tension the cover evenly across all anchor points. Start with opposite corners and work toward the middle. Covers should be tight but not over-stretched, which can cause tears.
Remove excess water weekly using a cover pump. Standing water adds weight and can damage your cover. Never use sharp tools to break ice on solid covers.
Check anchor points monthly for loose hardware. Tighten springs and straps as needed. Replace any damaged components immediately to maintain proper tension and safety.
Protecting your pipes with antifreeze and more
Pool antifreeze made with propylene glycol protects pipes from freeze damage when temps drop below 32°F. A proper blowout removes most water, while antifreeze safeguards what remains in your plumbing lines.
Do you need antifreeze for inground pools?
Most inground pools benefit from antifreeze during winter months. We recommend using propylene glycol-based pool antifreeze because it’s safe and effective down to -30°F.
The antifreeze doesn’t prevent all freezing. Instead, it protects your plumbing lines when small amounts of water remain after blowout.
When antifreeze is essential:
- You live in areas with freezing temperatures
- Your pipes run through unheated spaces
- You can’t completely drain all water from lines
Regular automotive antifreeze contains ethylene glycol. This type is toxic and damages pool equipment. Only use antifreeze labeled specifically for pools and plumbing.
We suggest buying 1-2 gallons for most inground pools. The exact amount depends on your pipe length and system complexity.
How to avoid pipe bursts in freezing weather
Pipe bursts happen when water freezes and expands inside your plumbing lines. We prevent this through proper water removal and protection methods.
Start with a thorough blowout. Use a shop vacuum or air compressor to remove water from all lines. Focus on the pool skimmer, returns, and equipment connections.
Add pipe insulation around exposed plumbing. Foam sleeves work well for straight runs. Wrap fittings and joints with insulating tape.
Key steps to prevent bursts:
- Remove drain plugs from equipment
- Blow out skimmer and return lines
- Add antifreeze to remaining water
- Install winter pool covers properly
Water expands about 9% when it freezes. Even small amounts left in pipes can cause thousands in damage.
Where and how antifreeze is actually applied
We add antifreeze to specific areas where water typically remains after blowout. The pool skimmer needs the most attention since it holds water in the trap.
Pour 1-2 quarts into each skimmer. The antifreeze settles into the trap and protects the pipe connection. Add more if you see it disappearing into the lines.
Target these areas:
- Skimmer traps and pipes
- Pool returns after blowout
- Equipment drain lines
- Spa jets and plumbing
For return lines, add antifreeze through the pool wall fittings. Pour slowly until you see it flowing back into the pool.
Never mix antifreeze with pool water. Only add it to lines that won’t circulate back to the main pool. The small amounts used won’t harm your pool chemistry when you reopen.
Follow manufacturer instructions for exact amounts. Most systems need 1-3 gallons total depending on pipe length and complexity.
Planning ahead for easier spring openings
Good winter prep cuts your spring work in half and saves money on chemicals and repairs. Smart closing steps prevent algae growth and protect your filter system during the cold months.
What smart winter prep saves you in spring
When we winterize properly, spring pool opening becomes much simpler. A well-closed pool stays cleaner through winter months.
Clean water means less work. Pools closed with balanced chemicals rarely develop major algae blooms. We spend less time scrubbing walls and floors when spring arrives.
Protected equipment lasts longer. Winterizing the filter system prevents freeze damage to pumps and pipes. This saves us from expensive repairs before we can swim again.
Fewer chemical shocks needed. Properly treated water needs smaller chemical adjustments in spring. We use less chlorine and balancing chemicals to get swimming-ready water.
The biggest time saver is clean pool surfaces. Algae prevention during winter means we skip the long cleaning process that dirty pools require.
How winterizing impacts pool startup costs
Poor winter prep leads to higher spring costs. The money we save on good winterizing pays for itself quickly.
Chemical costs stay low with proper closing. Balanced water needs fewer spring chemicals to reach safe swimming levels. We might spend $30 instead of $100 on opening chemicals.
Equipment repairs cost more than prevention. Frozen pipes or damaged pumps can cost $200 to $800 to fix. Good winterizing prevents most freeze damage.
Professional help costs less when pools are properly closed. Clean pools need basic spring service instead of major cleanup work.
Here’s what proper winterizing saves:
| Winter Prep Quality | Spring Chemical Cost | Potential Repair Cost |
| Good winterizing | $30-50 | $0-25 |
| Poor winterizing | $75-150 | $100-500 |
Maintenance habits to adopt before closing the pool
We should develop good habits during the swimming season to make closing easier. Off-season maintenance starts with summer care.
Keep detailed chemical records. Write down what chemicals we add and when. This helps us know exactly what the pool needs for closing.
Clean the filter system regularly. A clean filter works better during winterizing. Replace or clean filter elements before closing day.
Remove debris weekly. Less debris in the pool means easier pre-closing cleaning. We spend less time vacuuming before winterizing.
Test water twice per week. Regular testing shows us chemical trends. We learn how our pool responds to different treatments.
Brush walls and steps often. This prevents algae from getting established. Clean surfaces stay cleaner through winter months.
These habits make closing day faster and more effective. Well-maintained pools need less work to winterize properly.
Conclusion
Winterizing your inground pool is a simple process when you follow the right steps. We covered the essential tasks that protect your pool from freeze damage and make spring opening easier.
The time you spend now saves money and effort later. A properly winterized pool prevents expensive repairs from freeze damage. It also stops algae growth during the cold months.
Following our professional tips ensures your pool stays in great shape all winter long. When spring arrives, you’ll spend less time cleaning and more time enjoying your pool.
The methods we shared work for all inground pool types. Whether you have vinyl, fiberglass, or concrete, these steps protect your investment. Take your time with each step and don’t skip any part of the process.
Your pool will thank you next summer when it opens clean and ready for swimming season.
