FrostList

When to Winterize Your Boat in Las Vegas, NV

ON TRACK167 days until first 28°F freezeDec 25

The first 28°F freeze near Las Vegas averages December 25 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by December 18. The early-to-late range spans roughly 49 days, so treat the median as a midpoint, not a promise.

OUTLOOK

Typical first first 28°F freeze near Dec 25; local deadline about Dec 18. The live 10-day outlook loads here.

Local freeze dates for Las Vegas

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 24Dec 10Dec 29
28°F (hard freeze)Dec 4Dec 25Jan 22

NOAA station: Las Vegas Air Terminal · 4.3 mi away · 2,203 ft elevation.

Las Vegas draws its numbers from Las Vegas Air Terminal, 2,203 feet up and 4.3 miles away. Its median first-freeze dates are 32°F by Dec 10, 28°F by Dec 25. That hard freeze has landed anywhere from Dec 4 to Jan 22, a swing of roughly 49 days. Spring's last 32°F freeze clears around Jan 24.

Las Vegas usually sees its first 32°F night about Dec 10, with the first 28°F hard freeze close behind near Dec 25. The 32°F date swings from Nov 24 at its earliest to Dec 29 at its latest, near 35 days. The last spring freeze averages Jan 24 and as late as Feb 19, which sets the safe window for reopening outdoor water and de-winterizing gear. Snow barely registers here; the freeze date, around Jan 24, is the one that matters.

Your boat checklist

  1. Change the engine oil and filter while the motor is warm so contaminants leave with the old oil.
  2. Run the engine on antifreeze until pink fluid reaches the outlet, protecting the block and manifolds.
    Helpful gear: Marine antifreeze — Recommended pick
  3. Fog the cylinders with fogging oil as the engine runs down to coat internal parts against corrosion.
    Helpful gear: Fogging oil — Recommended pick
  4. Top off the fuel tank and add stabilizer to limit condensation and protect ethanol-blend fuel.
    Helpful gear: Marine fuel stabilizer — Recommended pick
  5. Drain the raw-water system, the livewell, and any washdown lines that can trap water.
  6. Remove the battery, charge it fully, and keep it on a maintainer over the layup.
    Helpful gear: Battery maintainer — Recommended pick
  7. Support the cover so snow and rain shed off, and leave vents so the interior can breathe.
  8. For an inboard or sterndrive, follow the manual closely — those blocks are the ones freeze claims hit hardest.

What to have on hand

Marine antifreeze
Propylene-glycol fluid rated for engine blocks and systems.
Recommended pick
Marine fuel stabilizer
Additive that protects ethanol-blend fuel over the layup.
Recommended pick
Fogging oil
Spray that coats cylinders against corrosion in storage.
Recommended pick
Battery maintainer
Keeps the cranking battery topped off on the trailer.
Recommended pick

What this means locally

Las Vegas freezes later than North Las Vegas (Dec 21) and close to Henderson (Dec 26) — a reminder that even nearby towns differ by days. Statewide, Nevada prep dates run Oct 11 through Dec 19, which is why Las Vegas gets its own number rather than a Nevada-wide average. The same freeze also decides when to winterize an RV and store a motorcycle.

Other winter jobs in Las Vegas

Every task below is dated to Las Vegas's own freeze and snow normals.

Sprinklers → Dec 15Frozen pipes → Nov 24Car battery → Dec 25Sump pump → Jan 24RV → Dec 15Motorcycle → Dec 10

See the full Las Vegas winter checklist, in order →

Frequently asked questions

At what temperature does a boat engine block crack?
Trapped water in an engine block or manifold can freeze and crack the casting once temperatures fall below 32°F and stay there long enough. Inboard and sterndrive blocks hold the most water and are the most vulnerable. Draining fully and adding antifreeze before the first hard freeze near Dec 25 is the protection.
Do outboards need winterizing?
Yes. An outboard should be drained so no water sits in the powerhead or lower unit, and the fuel system stabilized. Outboards self-drain better than inboards when tilted down, but fogging the cylinders and changing the gear oil are still part of a proper layup.
Fogging oil: is it necessary?
Fogging coats the cylinder walls and internal parts with a film that resists corrosion during months of storage. On engines that sit all winter it is cheap insurance against rust, especially in humid or coastal storage. Follow your engine maker's guidance on how to apply it.
How much does boat winterization cost?
A professional winterization varies with engine type and boat size, and inboards cost more than a simple outboard. Doing it yourself costs mainly antifreeze, oil, and fogging oil. Either way, the bill is far smaller than repairing a cracked block, which is the failure winterizing prevents.
Do boats in NV really need winterizing?
If temperatures reach freezing where the boat is stored, yes. Freeze claims are common in milder states precisely because owners assume they are safe and skip the step, then a rare cold snap cracks a block. Check the local freeze dates above and protect the engine before the first hard freeze.
When should I de-winterize my boat?
De-winterize in spring once the risk of a hard freeze has passed for your area. Reconnect and charge the battery, replace drain plugs, check hoses and clamps, and inspect the fuel system before the first launch. Reopening too early leaves the block exposed to a late cold snap.

Data: NOAA 1991–2020 normals via Las Vegas Air Terminal, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.