Winter Pool Closing Best Practices to Protect Against Ohio Freezes
Ohio and Kentucky winters bring sub-freezing temperatures, ice expansion, and freeze-thaw cycles that can damage unprotected pools. Cracked plumbing, burst filters, stained liners, or spring algae issues can be avoided. Follow this 10-step best practices guide to close your pool properly, and you will reopen it hassle-free next spring with no expensive repairs.
Pro Tip for 2026: In Lexington and across the Ohio River region, aim to close in mid-to-late October when water temperatures drop below 60 to 65 degrees Fahrenheit consistently. Do not wait for the first hard freeze. Early preparation beats last-minute panic as temperatures plummet.
Step 1: Gather Supplies and Plan Timing
Start early and gather everything before cold snaps arrive.
- Pool cover (solid or safety), cover pump, air blower or shop vac
- Winterizing chemicals: shock, algaecide, winterizing kit (non-chlorine oxidizer, enzymes if needed)
- Antifreeze (pool-specific, not automotive), plugs/gaskets, lube
- Test kit, brush, vacuum, telescopic pole
- Buckets for draining equipment
Timing matters. Close before sustained freezes (typically late September to mid-October in Ohio and Kentucky border areas) but after most leaves have fallen.
Step 2: Deep Clean the Pool
Remove debris that could stain or rot under the cover.
- Skim the surface, brush walls, floor, and steps to loosen algae and dirt
- Vacuum thoroughly (to waste if possible)
- Empty skimmer baskets, pump strainer, and cleaner bags
Clean water now prevents stains and makes spring opening easier.
Step 3: Test, Balance, and Shock the Water
Balance chemistry for winter stability.
- Test pH (7.2 to 7.6), alkalinity (80 to 120 ppm), calcium hardness, and phosphates
- Adjust as needed, then shock heavily (use chlorine or non-chlorine oxidizer)
- Add preventative algaecide and winterizing chemicals (follow label doses)
Circulate for 24 hours after shocking for even distribution.
Step 4: Lower the Water Level
Prevent ice damage to skimmers, returns, and walls.
- Drop water 4 to 6 inches below the skimmer opening (inground) or below return jets (above ground)
- For vinyl or above-ground pools: lower more if advised by the manufacturer to avoid wall collapse from ice
This step is critical. Freezing water expands and cracks anything in its path.
Step 5: Backwash and Clean Filter System
Protect your filtration equipment.
- Backwash sand or DE filters thoroughly, then rinse
- Clean cartridge filters (soak in cleaner if needed)
- Drain filter tank completely
Dirty filters left wet can freeze and crack.
Step 6: Blow Out and Drain Plumbing Lines
This is the number one freeze protection step for Ohio winters.
- Use an air compressor or blower to blow out lines (skimmer to pump, returns, heater, cleaner lines)
- Add pool antifreeze to lines (pour into skimmers and returns as you blow)
- Install winter plugs or gizzmos in all openings (skimmers, returns, drains)
- Remove directional fittings if possible
No water left in pipes means no bursts from ice expansion.
Step 7: Winterize Equipment
Drain and store vulnerable parts.
- Drain pump, heater, chlorinator, and salt cell completely
- Remove pump and store indoors (garage or basement)
- Disconnect and store ladders, diving boards, and lights
- Cover remaining equipment with a tarp or bags
Store everything dry and protected from rodents.
Step 8: Install Winter Cover and Accessories
Secure protection from debris, snow, and animals.
- Add air pillows or water tubes (prevents cover sag and ice pressure)
- Install solid winter cover (tightly secured with water tubes or straps)
- For safety covers: ensure proper tension and anchors
Never leave the pool uncovered in freeze-prone areas. Debris and ice cause major issues.
Step 9: Final Safety and Storage Checks
Double-check everything.
- Turn off all power to equipment
- Store chemicals safely (cool, dry place)
- Inspect cover for tears and patch now
- Safety: lock gates, remove toys and ladders
Enjoy peace of mind all winter long.
Step 10: Monitor Occasionally and Plan for Spring
Quick winter checks pay off.
- After big storms, ensure cover is secure and no pooling water exists
- Note any issues for spring repairs
- Schedule early opening (late April or May) to beat algae
You are set! Proper closing saves thousands in repairs.
Quick Lexington and Ohio Tip: Freeze-thaw cycles here are brutal. Many locals opt for professional closing services if plumbing is complex. DIY saves money but follow steps precisely.
Want more cold-weather tips? Subscribe for our spring opening series, or comment your biggest winter pool worry below. We are here to help your backyard stay protected year-round.