# When To Winterize Your Boat On Lake Michigan *By James Hills — Updated October 2026* Winterize your boat after the last run of the season and before the first hard freeze, which on southern Lake Michigan usually means October for boats in Chicago, Kenosha and Southwest Michigan, since the Chicago Park District harbors close for the season on October 31. Wait for a cold snap to force the job and you are gambling with the engine block, the water heater and every water line on board. **Questions****How To Tell If A Used Boat Was Winterized Properly Before You Buy It****Article Index** ** No answer selected. Please try again. Please select either existing option or enter your own, however not both. Please select minimum {0} answer(s). Please select maximum {0} answer(s). /polls/travel-and-trip-ideas/what-do-you-prefer-to-call-your-guys-trips.html?task=poll.vote&format=json 1 Guys Trips (573 votes / 44.11%) 44.11% votes Guys Getaways (131 votes / 10.08%) 10.08% votes Mancations (120 votes / 9.24%) 9.24% votes Brocations (170 votes / 13.09%) 13.09% votes [{"id":5,"title":"Guys Weekends","votes":305,"type":"x","order":1,"pct":23.480000000000000426325641456060111522674560546875,"resources":[]},{"id":6,"title":"Guys Trips","votes":573,"type":"x","order":2,"pct":44.1099999999999994315658113919198513031005859375,"resources":[]},{"id":7,"title":"Guys Getaways","votes":131,"type":"x","order":3,"pct":10.0800000000000000710542735760100185871124267578125,"resources":[]},{"id":8,"title":"Mancations","votes":120,"type":"x","order":4,"pct":9.2400000000000002131628207280300557613372802734375,"resources":[]},{"id":9,"title":"Brocations","votes":170,"type":"x","order":5,"pct":13.089999999999999857891452847979962825775146484375,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350 ** Vote Now** Vote Form** ResultVotes A boat that skipped a winterization or two can look fine at the dock and still be hiding a cracked part. Check these before you hand over a deposit. - Ask the seller for winterization and spring commissioning invoices from the last few seasons, since a shop receipt is the best proof the work was done every year. - Have the lower unit gear oil drained or sampled, because milky oil means water got into the gearcase. - Look for rust trails or crusty seepage on the engine block and exhaust manifolds, which can point to a crack from a past freeze. - Run the freshwater system, including the water heater and every faucet, and check underneath for drips from split lines. - Pay for a marine survey and a compression test on any used inboard or sterndrive, since both cost a fraction of a replacement engine. 1. [What Changes When You Trade Warm Weather Year-Round Boating For A Lake Michigan Layup](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#what-changes-when-you-trade-san-diego's-year-round-boating-for-a-lake-michigan-layup) 2. [What Boat Winterization Protects, From The Engine Block To The Water Lines](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#what-boat-winterization-protects,-from-the-engine-block-to-the-water-lines) 3. [When To Winterize Around Chicago, Kenosha And Southwest Michigan Before The First Hard Freeze](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#when-to-winterize-around-chicago,-kenosha-and-southwest-michigan-before-the-first-hard-freeze) 4. [The Boat Winterization Steps, In The Order A Good Shop Handles Them](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#the-boat-winterization-steps,-in-the-order-a-good-shop-handles-them) 5. [What Winterization Costs On The Great Lakes And Why It Belongs In Your Boat Budget](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#what-winterization-costs-on-the-great-lakes-and-why-it-belongs-in-your-boat-budget) 6. [Winterizing Is The Start - Don't Forget To Book Spring Commissioning When You Sign Up For Winter Storage](https://www.mantripping.com/stuff/when-to-winterize-your-boat-lake-michigan.html#book-spring-commissioning-when-you-sign-up-for-winter-storage) As October cools things down along Lake Michigan, a lot of owners start searching for "[boat winterization near me](https://www.chicagoyachtworks.com/boat-service/winterizing/)" and find out how much a modern boat holds that needs protecting. Engines and generators are the obvious ones, but ice makers, air conditioners, washdown pumps, hot water tanks, and the fresh, grey, and black water systems all carry water that can freeze and split something over a Great Lakes winter. ## What Changes When You Trade Warm Weather Year-Round Boating For A Lake Michigan Layup I lived in San Diego for a decade and there really is no winter layup there. Boats stay in the water all year long, and while maintenance is an issue obviously, regular seasonal maintenance on marine engines running in salt water, like freshwater flushes, zinc anodes, and keeping growth off the bottom, is a different issue than preparing for ice and snow. Freezing temperatures mean a  lot different level of preparation for boat owners. Now I am back on the Great Lakes in St. Joseph, Michigan (just across the lake from Chicago), where the season is short and every boat must be prepared for the winter. It is remarkable how involved and how important that process is, and first-time boaters may not know what's actually involved in protecting their investment from being damaged if it's done improperly. ### Fun Gnocchi Making Class With local Chef in Grand Rapids Learn to make sweet potato gnocchi with brown butter sage sauce in a beginner-friendly Grand Rapids class with Chef Jerry. Great for date nights or groups. 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I am shopping and talking with other boat owners but every time I drive past the marina ... the same debate plays out in my head ... should I buy something designed for the offshore chop to allow me to fish on Lake Michigan or a pontoon for the St. Joseph River that may also work ok on calm days on the lake. Regardless of which ends up being Heather and I's choice ... winterization is an inevitable and unavoidable part of that discussion, both the bill and the responsibility. Sometimes I think it might just be easier to get a boating membership instead of actual ownership but that's for another article. ## What Boat Winterization Protects, From The Engine Block To The Water Lines Boat winterization means draining every system on board or filling it with antifreeze, stabilizing the fuel, protecting the engine internals and storing the boat so ice and moisture cannot do damage before spring. When [water freezes,](https://www.usgs.gov/water-science-school) it expands by about 9 percent, which is enough to split an engine block, an exhaust manifold, a lower unit gearcase, or a water heater tank. ## Man Gear Pick of the Month September's Pick Amazon (affiliate) ### Kenyon City Grill Portable Stainless Steel Electric Grill Why we picked it: a grill you can actually carry to the campsite, the tailgate or the cabin without borrowing a truck. Stainless, no propane tank to wrestle, and hot enough to cook for four guys rather than reheat for one. 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If you hire a shop, ask which procedure they follow and make sure it matches the manufacturer's recommendations, rather than trusting them blindly. Winterization is also the annual reset. With the boat out of the water and the engine getting fresh oil, it is the easiest time of year to spot a worn impeller, a weeping hose or a soft spot in the deck before it costs you a weekend next July. ## When To Winterize Around Chicago, Kenosha And Southwest Michigan Before The First Hard Freeze The trigger for winterizing on Lake Michigan is the overnight low, not the first snow. Chicago's average first measurable snowfall doesn't arrive until around November 18, according to National Weather Service records, and a hard freeze inland can come before one at the lakefront, where the lake's stored summer warmth tends to keep the shoreline milder into fall. The marina calendar sets the rest. The Chicago Park District runs its 10 harbors from May 1 through October 31, so most Chicago boats come out in October whatever the weather is doing. Southport Marina in Kenosha, Wisconsin, offers both inside heated storage and outside storage, and Southwest Michigan sits in the same weather window about 90 minutes around the lake from Chicago. A common rule of thumb is to book the haul-out once nighttime lows regularly dip below 40 degrees Fahrenheit, leaving a buffer before the first freeze. Better yet, book the date in September. The last warm Saturday in October is tempting, especially if it is your one shot at a weekend fishing with the guys, but a boat still in the water when a hard freeze hits can turn that trip into a cracked engine block. ## The Boat Winterization Steps, In The Order A Good Shop Handles Them Every manufacturer has its own checklist, but a proper Lake Michigan winterization covers the same ground in roughly this order. - **Haul and clean** - Pull the boat, wash the hull, clean the bilge and take home anything damp, including cushions, life jackets, towels and electronics, before it turns to mildew. - **Fuel** - Add a marine fuel stabilizer, fill the tank nearly full with a little room for expansion, and run the engine long enough for treated fuel to reach the whole system, since ethanol-blended gas can absorb water and separate over a long layup. - **Engine oil** - Change the oil and filter so old, contaminated oil is not sitting in the engine all winter, and fog the cylinders if the manufacturer calls for it. - **Cooling system** - Drain the raw-water side or fill it with propylene glycol antifreeze rated at least 10°F below the coldest temperature you expect, and do not forget the sea strainers. - **Lower unit** - Drain and refill the gear oil on outboards and sterndrives, and pay attention to whether the old oil comes out milky. - **Onboard water systems** - Drain or antifreeze the freshwater tank, water heater, head, washdown pump, air conditioning and ice maker. - **Battery** - Disconnect it or take it home, and keep it on a maintainer through the winter. - **Cover** - Shrink wrap the boat or use a fitted cover, vented so condensation can escape. Use propylene glycol, the nontoxic pink antifreeze, not automotive ethylene glycol, which is toxic and has no place in a potable water system. The mistake that catches a lot of owners is skipping winterization because the boat is going indoors. Unless the building is heated, it gets as cold inside as out, and an unheated barn or storage building in Southwest Michigan in January can freeze an engine block just as surely as an open yard. BoatUS also advises against leaving a space heater running in a stored boat, since it fails during a winter-storm power outage, exactly when you would need it, and it is a fire risk. ## What Winterization Costs On The Great Lakes And Why It Belongs In Your Boat Budget Boatzon's 2026 roundup of posted dealer rates from Indiana, Wisconsin and Maine shops puts basic winterization at roughly $180 to $700 for an outboard and $400 to $800 for a sterndrive or inboard. Shrink wrap typically runs $16 to $30 per foot in cold-weather states, so roughly $340 to $630 for a 21-foot bowrider, and an oil change adds $150 to $250. Outdoor storage starts around $20 per foot, and heated indoor storage for the season can approach $3,000. For most family boats, the same roundup suggests budgeting $800 to $1,500 a year for service and shrink wrap, plus storage. That is the part of boating I never had to think about in San Diego. Before you buy a new or used boat for Lake Michigan, count the layup as a yearly cost of ownership, along with the hours someone has to put in every fall. Choosing the [right boat](https://www.mantripping.com/stuff/how-to-buy-the-right-boat-for-your-lifestyle.html) for your lifestyle, or the best [boat for your family](https://menwhoblog.com/how-to-pick-the-right-boat-for-your-family.html) if the kids are coming along, changes the fall bill too. The same roundup reports a 22-foot pontoon winterized for just under $750, while a 23-foot wake boat with ballast tanks, a heater and indoor storage runs $1,700 to $3,080 all in. Every tank, heater and extra onboard system adds to the October invoice, so if you are weighing a [pontoon or a bowrider for Lake Michigan](https://menwhoblog.com/is-a-pontoon-boat-or-bowrider-better-for-boating-on-lake-michigan.html), put the winterization quote for each side by side. If you will only get out a handful of weekends a summer, run the numbers on chartering instead. A salmon charter out of Milwaukee on a Great Lakes guys trip, or a day on the water during a [Michigan guys trip](https://www.mantripping.com/united-states/michigan.html), leaves the haul-out and the shrink wrap to someone else. Some guys split ownership with a buddy or a couple of work colleagues, which splits the winterization cost too, as long as everyone agrees up front who handles the haul-out. ## Winterizing Is The Start -  Don't Forget To Book Spring Commissioning When You Sign Up For Winter Storage Winterization is half of the job. The other half is spring commissioning: flushing the antifreeze out of the freshwater system, reinstalling and charging the battery, checking the impeller and hoses, and getting the boat back in the water. Book that launch date when you sign the storage contract in the fall, because the Chicago harbors open on May 1 and every owner on the lake wants the same first weekends. My take as someone shopping for a Lake Michigan boat: get a written quote for the haul-out, winterization, shrink wrap, storage and spring launch before you make an offer on the boat itself, and add that number to the purchase price. 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