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Before the first freeze: the desert home’s short winter list

Las Vegas does not have a winter so much as a handful of cold nights, and the whole point of preparing for them is that they are few. Here is what actually needs doing in the next three weeks, in the order the damage would happen.

Ask ten valley homeowners when the first freeze comes and you will get ten answers, and the Weather Service’s own averages do not settle it: depending on which decades you count, the airport’s first night at or below freezing lands somewhere between the last week of November and the second week of December. Two things are more useful than the date. The first is that Summerlin sits several hundred feet higher than the Strip and the west-side neighbourhoods against the Red Rock escarpment are higher still, so whatever the airport records, your yard will see it first and see it more often. The second is that a desert freeze is almost always a radiational one: a clear, still night after a cool day, when the ground gives its heat back to the sky. Those are forecastable three or four days out, and they are the nights the list below is for.

1. The backflow preventer, before anything else

Every irrigated lot here has one: the brass assembly standing above ground near the water meter or against a side wall, usually the single most exposed piece of plumbing on the property. It is full of water, it is outdoors, and it is the part that freezes and cracks first. A fitted foam cover from any hardware store, or an old towel inside a plastic bag taped around it, is enough for the handful of nights we get. On a brand-new home it may still be bare; the builder’s landscapers rarely cover it. The drip lines themselves are fine — they drain — and your controller is already down to one day a week as of today, which also means less water sitting in the pipes overnight.

2. Hose bibs and the garage

Disconnect the hoses. A hose left on a bib traps water in the fitting and that is what splits it. Foam bib covers cost a few dollars each and take a minute. Then go into the garage, because in most newer Las Vegas homes that is where the water heater lives, and if it is a tankless unit it has a freeze-protection circuit that only works while it has power. If you flip breakers when you travel over the holidays, leave that one on. Tank heaters are fine; garages here rarely get cold enough to trouble them.

3. The pool, on the cold nights only

Moving water does not freeze at the temperatures we see, so the rule is simply to keep it moving. Most variable-speed pumps have a freeze-protect setting that runs the pump when the air temperature drops toward freezing; check it is switched on and that the sensor is not buried behind the equipment pad. If yours is an older single-speed pump, set the timer to run through the small hours on the nights the forecast flags, and no more than that — the electricity bill is the only real cost of over-preparing a Las Vegas pool.

4. The plants that came with the house

Native and desert-adapted planting shrugs off our freezes. The casualties are the things people actually chose: citrus, bougainvillea, hibiscus, lantana, young ficus, and any tropical that looked wonderful at the nursery in April. In a new-construction yard the builder’s plants are also young, which makes them more vulnerable for their first two winters than they will ever be again. The method is older than the valley: water the day before a freeze night, because moist soil holds and releases heat and dry soil does not; then drape frost cloth or an old bedsheet over the plant down to the ground, so it traps the warmth coming up from the soil. Never plastic, which conducts the cold straight to the leaf it touches, and take the cover off in the morning. A string of old incandescent holiday lights under the cloth on a lemon tree is not a myth; it is a couple of degrees, and a couple of degrees is usually the whole argument.

5. The furnace’s first run

The first time the heat comes on it will smell of burnt dust for twenty minutes. That is normal; a smell that persists is not. Change the filter now if you have not since spring — the summer’s dust storms will have loaded it — and press the test button on the carbon-monoxide detector. New homes are built with them; older resale homes were not always, and a plug-in unit is cheap insurance for any house with a gas furnace and a gas water heater in the same space. Flip the ceiling fans to clockwise on low while you are at it, which pushes the warm air pooled at the ceiling back down into the room without a draught.

6. Doors, thresholds, and the sun you want back

Summer here is about keeping the sun out. For the next three months it is the cheapest heat you have. Open the south- and west-facing blinds through the afternoon and close them at dusk, the reverse of your July habit. Check the weatherstrip on the garage door and the sweep on the front door — the summer heat cooks the rubber, and a gap you cannot see will cost you more in January than it did in July, because the temperature difference across it is larger.

What you can skip

Pipe insulation inside the walls, snow shovels, storm windows, and anything a Midwestern relative insists on. Interior plumbing in a modern Las Vegas home is not at risk from the cold we get. Nor do you need to drain the irrigation system or blow out the lines; the drip simply drains itself. The entire list above is an afternoon, and most of it is a single trip to the hardware store for foam covers and a roll of frost cloth. Do it on the next warm Saturday, and the first freeze warning of the season becomes a weather headline rather than a chore.

Before you plan around any of it

Freeze-date figures above are the published long-run averages for the airport as reported from National Weather Service data, checked on November 1, 2026; they vary by source and by neighbourhood elevation, and a specific forecast beats any average. Follow your equipment manufacturer’s instructions on freeze protection, and the Southern Nevada Water Authority’s current schedule for watering days.