Winterizing a Las Vegas Home: 10 Things to Do Before the First Freeze

Yes, Las Vegas freezes — here is when and where

On the valley floor, the first freeze of the season typically arrives in mid-to-late November, and hard freezes — the kind that split pipes — happen a handful of nights most winters, usually in December and January. The trap is geography. Summerlin sits around 2,600 to 3,000 feet, the foothills in Henderson run several degrees colder than the Strip, and neighborhoods like Skye Canyon and Centennial Hills regularly see lows in the low 20s while downtown barely touches freezing. So "it doesn't really freeze in Vegas" is true exactly until the night it does — and one burst pipe costs more than every item on this list combined, several times over.

The good news: winterizing a desert home is an afternoon, not a season. You are not blowing out sprinkler lines with a compressor like in Denver or wrapping every pipe in the house. You are protecting a short, specific list of things that Las Vegas cold actually damages. Here are the ten that matter, in the order we would do them.

The 10-step winterizing checklist

1. Disconnect hoses and cover every hose bib

The single most common freeze failure in the valley is the humble hose bib. A garden hose left connected traps water in the faucet body, that water freezes and expands, and the pipe splits inside the wall — where you find it in spring, as a leak. Disconnect and drain every hose, then slip a foam faucet cover (typically a few dollars at any hardware store) over each outdoor spigot. Do the same for casita and outdoor-kitchen faucets, which homeowners forget because they rarely use them in winter.

2. Protect the irrigation backflow preventer

Most Las Vegas homes have an above-ground backflow preventer for the irrigation system — that cluster of brass pipes near the side yard or water meter. It is full of water, fully exposed, and the single most freeze-vulnerable part of the system. At minimum, wrap it in a fitted insulation cover or a thick towel inside a plastic bag. If you shut irrigation down for winter, open the drain valves afterward so trapped water has somewhere to go. A cracked backflow body in January is an emergency call; ten minutes of insulation in November is not.

3. Insulate exposed pipes in the garage, attic and exterior walls

Walk the garage and look up: water lines running along exterior garage walls and across attic spaces are the indoor freeze risk here, because neither space is heated. Foam pipe sleeves (typically $2–$5 per length) snap on in minutes. Pay special attention to the pipes feeding the water heater if it lives in the garage, and to any line serving an outdoor shower or a casita bath. In the foothills and Summerlin, treat this step as mandatory, not optional.

4. Replace worn weatherstripping and door sweeps

Freeze protection is only half the story — the other half is that a Las Vegas winter night will find every gap in your door seals and tax your furnace for it. Run your hand around exterior doors on a breezy evening; if you feel air, the weatherstripping is done. Peeling or compressed seals and a door sweep that no longer touches the threshold are quick, inexpensive fixes, and they pay you back again in July when the same gaps leak cooled air and let desert dust in. See our caulking and weatherproofing service if the gaps are beyond the seals themselves.

5. Change the furnace filter before the first cold snap, not during it

Swap the filter — in dusty desert homes, every 1–3 months is realistic — then run the heat for a full cycle on a mild day. You want to discover a dead igniter or a tripped limit switch in October, when it is an appointment, rather than on the first 35-degree night, when every HVAC company in the valley has a two-day backlog. While the system runs, walk the house and confirm every vent is open and unblocked.

6. Reverse ceiling fans and check the settings

Ceiling fans have a direction switch for a reason. In winter, run them clockwise on low: that pushes the warm air pooled at the ceiling down along the walls without creating a breeze. It will not transform a cold room, but in the two-story great rooms common in Henderson and Summerlin homes, it genuinely evens out the temperature between floors.

7. Reseal exterior caulk lines

Check the caulk around windows, doors, stucco penetrations and where pipes and conduit enter the house. Desert summers bake caulk hard and cracked; winter wind-driven rain (yes, we get some) finds those cracks, and so does cold air. Scrape and reseal the failures now. This is the same inspection we recommend every fall for stucco homes, because water intrusion through failed caulk is a slow, expensive kind of damage.

8. Put pool and spa equipment on freeze protection

If you have a pool, confirm the pump's freeze-protection mode is enabled — most modern controllers turn the pump on automatically when air temperature nears freezing, moving water so it cannot ice up in the plumbing and filter. If your system is older and manual, the rule for hard-freeze nights is simple: run the pump all night. A cracked filter housing or split PVC manifold costs far more than a few nights of electricity.

9. Know the hard-freeze night routine

When the forecast calls for a low below about 28°F — a few nights most winters — do three things before bed: let faucets on exterior walls drip slowly, open the cabinet doors under kitchen and bathroom sinks on outside walls so house air reaches the pipes, and make sure the pool pump is running. Inside walls in a heated home rarely freeze; this short routine covers the marginal cases, which are exactly the ones that burst.

10. Test smoke and CO detectors, and check the fireplace before first use

Winter is when furnaces, fireplaces and space heaters run, which makes it carbon-monoxide season too. Test every smoke and CO detector, replace batteries that are due, and check detector ages — most expire after 10 years. Before the first fire of the season, look up the flue: heavy creosote buildup or debris means a chimney sweep before you light anything. If your home has no CO detector near the bedrooms, adding one is the cheapest safety upgrade on this entire list.

What it costs to have it done for you

Most of the labor on this list — weatherstripping, caulk, foam insulation, faucet covers, filters, detector checks — is classic handyman-scope work. Bundled into one visit, it typically falls in our small-to-medium job ranges ($120–$250 depending on how many doors, faucets and pipe runs your house has), and estimates are free. The items that belong to licensed trades — furnace repairs, gas fireplace work — we will flag honestly rather than touch. Compare that with the alternative everyone in this trade has seen: one split pipe in an exterior wall, with drywall, paint and flooring to redo afterward.

If winter prep is part of a bigger annual routine, pair this list with our year-round Las Vegas home maintenance checklist — and if your doors are already sticking or failing to latch as the weather turns, our guide to why doors stick in Henderson covers the fixes.

Most homes land in our small-to-medium range — $120–$250 depending on the list — quoted in writing before we start.

Frequently Asked Questions

When does Las Vegas usually get its first freeze?

Typically mid-to-late November on the valley floor, and earlier at elevation — Summerlin, the Henderson foothills and the far northwest can see their first freeze a week or two sooner. Hard freezes into the 20s are most common in December and January. Aim to finish this list by early November and you are ahead of nearly every cold snap.

Do I need to drain or blow out my irrigation system?

Usually not in Las Vegas. Our freezes are brief rather than sustained, so insulating the backflow preventer and any exposed lines is normally enough. Homes at higher elevation or with long exposed runs are the exception — if in doubt, shut the irrigation supply off and open the drain valves on the coldest nights.

Will pipes freeze at exactly 32 degrees?

Almost never inside a heated home. Pipes are at real risk when temperatures fall into the mid-to-high 20s and stay there for hours, and the vulnerable ones are in garages, attics and exterior walls — not interior plumbing. That is why the hard-freeze routine focuses on those locations.

Is winterizing different in Henderson and Summerlin than in Las Vegas?

Only in degree — literally. Elevation makes Summerlin and the Henderson foothills a few degrees colder on clear winter nights, so steps that are "smart" downtown (pipe insulation, backflow covers) are closer to mandatory up there. The checklist itself is the same.

Related guides

• Las Vegas Home Maintenance Checklist
• Why Doors Stick in Henderson — Causes and Fixes