FrostList

When to Winterize Your Boat in Bartlett, IL

ON TRACK105 days until first 28°F freezeOct 24

The first 28°F freeze near Bartlett averages October 24 (1991–2020 normals) — enough to crack an unprotected block even where owners assume they're safe — so winterize the boat by October 17. The early-to-late range spans roughly 28 days, so treat the median as a midpoint, not a promise.

OUTLOOK

Typical first first 28°F freeze near Oct 24; local deadline about Oct 17. The live 10-day outlook loads here.

Local freeze dates for Bartlett

ThresholdEarly (1-in-10)MedianLate (9-in-10)
32°F (light freeze)Sep 29Oct 13Oct 25
28°F (hard freeze)Oct 8Oct 24Nov 5
24°F (severe)Oct 22Nov 3Nov 18

NOAA station: Streamwood · 2.1 mi away · 819 ft elevation.

The reference station for Bartlett is Streamwood (2.1 mi, 819 ft). First freeze there: 32°F by Oct 13, 28°F by Oct 24, 24°F by Nov 3. Year to year the 28°F date has ranged from Oct 8 to Nov 5 — about 28 days apart. Spring's last 32°F freeze clears around Apr 30. Snowfall averages 34 inches a year, first reaching an inch near November.

Expect the first frost near Oct 13 in Bartlett and the first hard freeze by about Oct 24. The 32°F date swings from Sep 29 at its earliest to Oct 25 at its latest, near 26 days. The last spring freeze averages Apr 30 and as late as May 16, which sets the safe window for reopening outdoor water and de-winterizing gear. About 34 inches of snow a year is enough to justify servicing the snow blower and watching the eaves.

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, Bartlett's first-freeze date near Oct 24 sits close to Hanover Park (Oct 24) and close to Streamwood (Oct 24). Illinois's deadlines span Oct 17 to Nov 8 statewide — one date for all of Illinois would be off by weeks for Bartlett. Once you know Bartlett's freeze date, use it to winterize an RV and store a motorcycle too.

Other winter jobs in Bartlett

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

Sprinklers → Oct 14Frozen pipes → Sep 29Ice dams → Oct 16Car battery → Oct 24Snow blower → Oct 25Sump pump → Apr 30RV → Oct 14Motorcycle → Oct 13

See the full Bartlett 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 24 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 IL 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 Streamwood, live outlook by Open-Meteo. Sources · Methodology. Last updated: July 11, 2026.