FrostList

When to Winterize Your Boat in Evansville, IN

ON TRACK132 days until first 28°F freezeNov 20

The first 28°F freeze near Evansville averages November 20 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by November 13. It's a short step from frost to a hard freeze: roughly 10 days on average.

OUTLOOK

Typical first first 28°F freeze near Nov 20; local deadline about Nov 13. The live 10-day outlook loads here.

Local freeze dates for Evansville

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Oct 27Nov 10Nov 25
28°F (hard freeze)Nov 5Nov 20Dec 6
24°F (severe)Nov 13Dec 1Dec 20

NOAA station: Evansville Museum · 0.5 mi away · 374 ft elevation.

For Evansville, the nearest NOAA station with freeze data is Evansville Museum, 0.5 miles out at 374 feet. Median first-freeze dates there run 32°F by Nov 10, 28°F by Nov 20, 24°F by Dec 1. The 28°F freeze has come as early as Nov 5 and as late as Dec 6, a 31-day spread. Spring's last 32°F freeze clears around Mar 29. Snowfall averages 11 inches a year, first reaching an inch near December.

Expect the first frost near Nov 10 in Evansville and the first hard freeze by about Nov 20. Year to year, the first 32°F night has fallen anywhere from Oct 27 to Nov 25 — about 29 days apart. Spring's final freeze lands near Mar 29 and as late as Apr 11, so that is when outdoor water and stored gear can safely come back online. Snow is light here, near 11 inches a year, so pipe and battery cold usually matters more than plowing.

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, Evansville's first-freeze date near Nov 20 sits later than Owensboro (Nov 13) and later than Bowling Green (Nov 10). Indiana's deadlines span Oct 21 to Nov 13 statewide — one date for all of Indiana would be off by weeks for Evansville. Once you know Evansville's freeze date, use it to winterize an RV and store a motorcycle too.

Other winter jobs in Evansville

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

Sprinklers → Nov 10Frozen pipes → Oct 27Ice dams → Nov 15Car battery → Nov 20Snow blower → Nov 24Sump pump → Mar 29RV → Nov 10Motorcycle → Nov 10

See the full Evansville 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 20 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 IN 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 Evansville Museum, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.