FrostList

When to Winterize Your Boat in Weymouth Town, MA

ON TRACK114 days until first 28°F freezeNov 2

The first 28°F freeze near Weymouth Town averages November 2 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by October 26. The early-odds date runs roughly 14 days ahead of the median, so build in that buffer.

OUTLOOK

Typical first first 28°F freeze near Nov 2; local deadline about Oct 26. The live 10-day outlook loads here.

Local freeze dates for Weymouth Town

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 6Oct 22Nov 5
28°F (hard freeze)Oct 19Nov 2Nov 16
24°F (severe)Nov 2Nov 15Dec 1

NOAA station: Hingham · 1.6 mi away · 35 ft elevation.

For Weymouth Town, the nearest NOAA station with freeze data is Hingham, 1.6 miles out at 35 feet. Median first-freeze dates there run 32°F by Oct 22, 28°F by Nov 2, 24°F by Nov 15. The 28°F freeze has come as early as Oct 19 and as late as Nov 16, a 28-day spread. Spring's last 32°F freeze clears around Apr 25. Snowfall averages 51 inches a year, first reaching an inch near December.

The freeze arrives in two steps in Weymouth Town: 32°F around Oct 22, then a hard 28°F near Nov 2. The 32°F date swings from Oct 6 at its earliest to Nov 5 at its latest, near 30 days. The last spring freeze averages Apr 25 and as late as May 8, which sets the safe window for reopening outdoor water and de-winterizing gear. Roughly 51 inches of snow fall in an average year, so a clear roof edge and a running snow blower matter as much as the freeze itself.

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, Weymouth Town (first freeze Nov 2) runs close to Quincy (Nov 2) and close to Brockton (Oct 31). Across Massachusetts, local prep deadlines in our data range from Oct 11 to Nov 14, so a statewide rule of thumb would miss Weymouth Town by weeks. In Weymouth Town, that same cold is your cue to winterize an RV and store a motorcycle.

Other winter jobs in Weymouth Town

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

Sprinklers → Oct 23Frozen pipes → Oct 6Ice dams → Nov 15Car battery → Nov 2Snow blower → Nov 24Sump pump → Apr 25RV → Oct 23Motorcycle → Oct 22

See the full Weymouth Town 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 Nov 2 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 MA 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 Hingham, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.