FrostList

When to Winterize Your Boat in Memphis, TN

ON TRACK140 days until first 28°F freezeNov 28

In Memphis, target November 21 to drain, antifreeze, and lay up the boat, about a week before the median first 28°F freeze of November 28; a surprise cold snap is exactly how freeze claims happen. It's a short step from frost to a hard freeze: roughly 12 days on average.

OUTLOOK

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

Local freeze dates for Memphis

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Nov 2Nov 16Dec 3
28°F (hard freeze)Nov 10Nov 28Dec 18
24°F (severe)Nov 19Dec 13Jan 8

NOAA station: Memphis Intl AP · 7.3 mi away · 254 ft elevation.

For Memphis, the nearest NOAA station with freeze data is Memphis Intl AP, 7.3 miles out at 254 feet. Median first-freeze dates there run 32°F by Nov 16, 28°F by Nov 28, 24°F by Dec 13. The 28°F freeze has come as early as Nov 10 and as late as Dec 18, a 38-day spread. Spring's last 32°F freeze clears around Mar 16. Snowfall averages 3 inches a year.

Expect the first frost near Nov 16 in Memphis and the first hard freeze by about Nov 28. Year to year, the first 32°F night has fallen anywhere from Nov 2 to Dec 3 — about 31 days apart. Spring's final freeze lands near Mar 16 and as late as Apr 4, so that is when outdoor water and stored gear can safely come back online. Measurable snow is rare, so the freeze near Mar 16 — 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

Against its neighbors, Memphis (first freeze Nov 28) runs later than Bartlett (Nov 17) and close to Southaven (Nov 28). Across Tennessee, local prep deadlines in our data range from Oct 23 to Nov 21, so a statewide rule of thumb would miss Memphis by weeks. In Memphis, that same cold is your cue to winterize an RV and store a motorcycle.

Other winter jobs in Memphis

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

Sprinklers → Nov 18Frozen pipes → Nov 2Car battery → Nov 28Sump pump → Mar 16RV → Nov 18Motorcycle → Nov 16

See the full Memphis 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 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 TN 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 Memphis Intl AP, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.