FrostList

When to Winterize Your Boat in Burlington, VT

ON TRACK109 days until first 28°F freezeOct 28

Plan to haul out and winterize your boat in Burlington by October 21. The first 28°F freeze near Burlington averages October 28 in the 1991–2020 normals, and freeze damage often surprises owners in milder states. It's a short step from frost to a hard freeze: roughly 13 days on average.

OUTLOOK

Typical first first 28°F freeze near Oct 28; local deadline about Oct 21. The live 10-day outlook loads here.

Local freeze dates for Burlington

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 2Oct 15Nov 1
28°F (hard freeze)Oct 12Oct 28Nov 12
24°F (severe)Oct 26Nov 9Nov 23

NOAA station: Burlington Intl AP · 3.1 mi away · 330 ft elevation.

For Burlington, the nearest NOAA station with freeze data is Burlington Intl AP, 3.1 miles out at 330 feet. Median first-freeze dates there run 32°F by Oct 15, 28°F by Oct 28, 24°F by Nov 9. That hard freeze has landed anywhere from Oct 12 to Nov 12, a swing of roughly 31 days. Spring's last 32°F freeze clears around Apr 29. Snowfall averages 88 inches a year, first reaching an inch near November.

Expect the first frost near Oct 15 in Burlington and the first hard freeze by about Oct 28. Year to year, the first 32°F night has fallen anywhere from Oct 2 to Nov 1 — about 30 days apart. Spring's final freeze lands near Apr 29 and as late as May 11, so that is when outdoor water and stored gear can safely come back online. With about 88 inches of snow a year, roof, snow-blower, and ice-dam prep all belong on the same calendar.

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

Against its neighbors, Burlington (first freeze Oct 28) runs later than Montpelier (Oct 21) and close to Schenectady (Oct 28). Across Vermont, local prep deadlines in our data range from Oct 14 to Oct 21, so a statewide rule of thumb would miss Burlington by weeks. In Burlington, that same cold is your cue to winterize an RV and store a motorcycle.

Other winter jobs in Burlington

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

Sprinklers → Oct 18Frozen pipes → Oct 2Ice dams → Oct 16Car battery → Oct 28Snow blower → Oct 25Sump pump → Apr 29RV → Oct 18Motorcycle → Oct 15

See the full Burlington 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 Oct 28 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 VT 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 Burlington Intl AP, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.