Mild climate pools often freeze across the surface overnight. However, if the ice sheet becomes thicker than ¼” to ½”, it will put pressure on your pool tile and skimmers as the ice expands. Most pool tile is frost-free, but you should keep the water under the perimeter pool tile band to be safe.
While a thin layer of ice is unlikely to damage your pool, if you live in an area with continuous below-freezing temperatures, we highly recommend you winterize and close your pool at the end of swimming season. Keeping your pool open all year long is also an option.
If the pool is already frozen more than 1/2″ thick, wait for a bit of a thaw before lowering, or break up the ice first before and while lowering the water level. For safety pool covers, be careful not to lower the pool more than 12″ below the tile line.
An Ice Filled Pool
When the water freezes in the pool, the expansion puts the pressure outward on the pool wall. When there is an air pillow in the water, the pressure is instead focused on the pillow, instead of the pool wall. Winter Damage On Above Ground Pools can happen without proper preparation.
The weather needs to be at or below 20 degrees Fahrenheit (-6.7°C) the pool pipes to freeze solid. At 32°F (0°C), water will begin to freeze up and will eventually freeze solid but after some hours or days.
KEEP YOUR POOL MAINTENANCE UP TO DATE
If you do not keep up with these maintenance items, then the flow of water through your pool equipment will be greatly diminished. In a freeze situation, this can lead to freeze damage on your equipment.
Bring the pump housing into an area where the temperature is above freezing. Eventually, the ice in the pump melts and the pump can be flushed, winterized and reconnected back into the filtration lines of the pool.
Yes, they can freeze solid. If temperatures reach below zero, swimming pools that are not circulating can freeze solid within a few days. If those low temperatures continue for several days, the ice sheet can increase in thickness by up to ¼” per day.
Helpful tips to keep your pool and its equipment safe during freezing temperatures. Run your pool pump continuously when temperatures are near or below freezing. You don't need to run your heater, moving water likely will not freeze.
If you have an above ground pool with the pool filter system and plumbing above ground (like nearly all above ground pools), pipes and pumps can freeze up in less than an hour of minus 32 degrees.
Information varies on how cold it has to be for pipes to freeze, but the freezing temperature of water is 32 degrees. So, theoretically, your pipes could freeze at any temperature lower than that. But for your pipes to literally freeze overnight, the temperature would probably have to drop to at least 20 degrees.
Without winterizing your pool, the water could turn green with algae. If the chlorine system stops functioning, you'll say adieu to the beautiful blue pool you know and love. Come spring, your pool will be a homely sight and cause a real dent in your wallet. Bacteria that feed on algae could even cause health risks.
Another reason for a pool to lose water over the winter is due to the harsh elements. Ice, snow, and water can accumulate on top of the pool cover. When too much weight forces the pool cover into the surface of the pool, water may rise up and over the pool sides. This is called displacement.