A North Texas pool should run all winter on four to six hours a day at low speed, and continuously through a hard freeze. That is under half the ten to fourteen hours of a summer schedule, and the hours belong in the warmest part of the day.
The schedule matters because the winter pump is freeze insurance first and a circulation schedule second. The pools that get damaged in a freeze here are usually the ones switched off in November to save money, or the ones whose water level dropped below the skimmer and lost prime without anybody noticing. Both are free to prevent and both cost a plumbing repair to get wrong.
Why North Texas pools aren’t closed for winter
North Texas pools aren’t closed for winter because our winter doesn’t call for it. The National Weather Service’s Dallas/Fort Worth climate narrative puts it plainly: “Winters are generally mild, but the season features considerable temperature variability. Periodic cold fronts bring usually brief spells of below normal temperatures.” In a backyard that means January days in the 50s and 60s and a handful of nights in the teens.
Closing a pool the northern way means removing the water from every line, plugging every fitting, and lowering the pool below the skimmer and returns so that nothing is left to freeze. That’s a full day of work, reversed in spring, and it makes sense in a climate with four unbroken months below freezing. A pool fully closed here would spend most of the winter shut down for weather that didn’t come, and would be safe on the night that mattered only if someone had done the work perfectly. So the local practice is to leave the pool running and treat the cold nights as events rather than as a season.
Moving water is the whole defense
Water freezes from the outside of a pipe inward and needs still conditions to do it. A steady flow, even a slow one, keeps warmer water from the body of the pool cycling through the exposed above-ground plumbing all night. Brief can still mean days: in February 2021 the National Weather Service recorded 139 consecutive hours at or below freezing at DFW Airport. That is why the advice during a hard freeze is to run the pump continuously rather than harder, and why switching it off to save money during a cold snap ends in a plumbing repair.
How many hours a winter pool needs
A winter pool needs four to six hours of circulation a day, because the requirement scales with what the water is doing biologically, and in winter it is barely doing anything. Below about 60 degrees algae is effectively dormant, chlorine is consumed slowly, and sunlight is weaker and shorter. The pool needs only enough turnover to distribute chemicals, move water through the filter, and keep the surface from stagnating.
| Season | Water temperature | Daily run time | Speed |
|---|---|---|---|
| Deep winter (Dec to Feb) | Below 60 | 4 to 6 hours | Low |
| Spring (Mar to Apr) | 60 to 75 | 6 to 10 hours | Low to medium |
| Summer (May to Sep) | Above 75 | One full turnover, often 10 to 14 at low speed | Low, longer |
| Fall (Oct to Nov) | 60 to 75 | 6 to 10 hours, more during leaf drop | Low to medium |
| A hard freeze, any month | Air below 32 | Continuous | Low is fine, don’t stop |
The exceptions to four to six hours are a pool with a spa, a heavily shaded pool full of winter leaf drop, and a salt pool, which brings its own wrinkle covered below.
Run those hours in the warmest part of the day, roughly late morning to mid afternoon. That keeps the scheduled run separate from the cold night hours, when freeze protection starts the pump on its own if it needs to, so an overnight schedule only doubles up on what the automation already covers. Daylight running also lets you see the pump working, which is how a failed pump gets noticed in January rather than two weeks later. If your electricity plan prices overnight hours cheaply, weight the schedule toward them but keep some daylight hours, since a salt cell makes less chlorine in cold water and none at all while the pump is off. For a real turnover rather than a guess at hours, our pump run time guide has the arithmetic.
What it costs to run through the winter
The case against a winter schedule is the power bill for a pool with no swimmers in it, and how much weight it carries depends mostly on which pump you have.
On a variable speed pump
A variable speed pump costs little to run through winter, because power draw falls with roughly the cube of pump speed: at half speed it uses somewhere near an eighth of the power. Five hours a day at a low winter speed costs less than the deductible on any repair it prevents, so there’s no serious financial argument for shutting one down.
On an older single speed pump
A single speed pump costs more, because its one setting is expensive. Even so, five hours a day for three months is a modest total, and one split pipe or one cracked pump housing costs more than several winters of it. If the winter bill is what is driving the question, the better fix is the pump rather than the schedule, and repair or replace covers when that upgrade pays for itself.
What still needs doing in the water
A winter pool needs little work in the water, which is why it is easy to neglect past the point of recovery.
- Chlorine. Hold the low end of your range rather than the top. Cold water consumes little chlorine, and a winter pool will often hold a residual for two or three weeks. Test every two weeks rather than weekly.
- pH and alkalinity. Check monthly. pH drifting high in winter is what sets up scale on the tile come spring, particularly on our fill water. Our calcium scale guide covers why that band appears.
- Water level. The most important physical check of the winter. Keep it at mid-skimmer. A level below the skimmer throat lets the pump pull air, and a pump that loses prime during a cold snap is no longer protecting anything.
- Debris. Empty the baskets. Leaf and pecan drop runs well into December here, and a clogged basket restricts the flow you’re relying on.
- Brushing. Every couple of weeks is plenty. It’s the cheapest insurance against the algae that will otherwise be waiting in March.
Salt pools stop making chlorine in cold water
Salt chlorine generators produce less chlorine as water cools, and most cells stop generating entirely once the water drops into the 50s, to protect themselves. The manufacturer sets the exact cutoff, and your manual gives it. That’s a design feature rather than a fault, but it means a salt pool in a North Texas January is often making no chlorine at all while its owner assumes it is.
So check free chlorine with a test kit rather than trusting the cell, and add liquid chlorine directly when it has fallen. Don’t raise the cell output percentage to compensate: a cell that has shut itself off makes nothing at any setting. Our salt water maintenance guide covers the cold water cutoff and what winter does to cell life.
The night the schedule stops applying
A hard freeze replaces the winter routine with continuous running and a few steps at the pad. When air temperatures are forecast below freezing, run the pump continuously through the event rather than on a timer. Open the valves that keep water moving through every line, including the spa and any water features. Leave the freeze protection setpoint alone rather than switching the system off overnight. And if the power fails, the pool stops being self-defending, and the plumbing needs draining by hand.
Our Texas freeze protection guide covers those steps in full, including the case that catches Texans specifically: the power going out and taking the automatic protection with it.
How we run winter visits
We keep customer pools running year round on a reduced winter schedule, and winter visits exist mostly to check the things above: water level, prime, freeze settings, baskets, and a chemistry reading that has probably barely moved. It’s lighter work than August and our rate doesn’t change for it, which is the trade a level annual price makes in both directions.
If you would rather somebody else watched the pad through January, weekly service is published with its pricing, and an equipment inspection before the first hard freeze is the cheapest thing on our list.
