FrostList

When to Winterize Your Boat in Jackson, MS

ON TRACK146 days until first 28°F freezeDec 4

The first 28°F freeze near Jackson averages December 4 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by November 27. Year to year the date swings about 53 days, which is why the live outlook beats the calendar.

OUTLOOK

Typical first first 28°F freeze near Dec 4; local deadline about Nov 27. The live 10-day outlook loads here.

Local freeze dates for Jackson

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 4Nov 19Dec 10
28°F (hard freeze)Nov 11Dec 4Jan 3
24°F (severe)Nov 28Dec 29Jan 24

NOAA station: Jackson Hawkins Fld · 3.4 mi away · 342 ft elevation.

Jackson draws its numbers from Jackson Hawkins Fld, 342 feet up and 3.4 miles away. Its median first-freeze dates are 32°F by Nov 19, 28°F by Dec 4, 24°F by Dec 29. Year to year the 28°F date has ranged from Nov 11 to Jan 3 — about 53 days apart. Spring's last 32°F freeze clears around Mar 6. Snowfall averages 1 inches a year.

In Jackson, freezing nights (32°F) typically begin around Nov 19 and the first hard freeze (28°F) follows near Dec 4. Year to year, the first 32°F night has fallen anywhere from Nov 4 to Dec 10 — about 36 days apart. Spring's final freeze lands near Mar 6 and as late as Mar 24, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Mar 6 — not snow load — drives the local prep list.

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

Compared with nearby cities, Jackson's first-freeze date near Dec 4 sits later than Hattiesburg (Nov 30) and later than Meridian (Nov 27). Mississippi's deadlines span Nov 20 to Dec 26 statewide — one date for all of Mississippi would be off by weeks for Jackson. Once you know Jackson's freeze date, use it to winterize an RV and store a motorcycle too.

Other winter jobs in Jackson

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

Sprinklers → Nov 24Frozen pipes → Nov 4Car battery → Dec 4Sump pump → Mar 6RV → Nov 24Motorcycle → Nov 19

See the full Jackson 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 4 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 MS 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 Jackson Hawkins Fld, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.