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Winterizing a Wisconsin Lake Cabin: A Season-by-Season Shutdown Plan

Winterizing a Wisconsin lake cabin: pull the pier in September, drain the plumbing in October, and handle the holding tank, propane, and mice. Full shutdown plan.

Winterizing a Wisconsin Lake Cabin: A Season-by-Season Shutdown Plan

Wisconsin lake cabins get closed on two different schedules. The pier, the boat lift, and the shore station come out in late September or early October, before the water gets too cold to stand in, and the plumbing gets drained a few weeks later, once the last fall weekend is over and before the first stretch of nights in the teens. Owners who blur those two jobs together tend to end up wading in 45-degree water in November or discovering a split supply line in April.

The Northwoods around Minocqua, Eagle River, Hayward, and Rhinelander see hard freezes by mid-October and frost depths of four to five feet by midwinter. Door County, the Waupaca chain, and the lakes around Lake Geneva and Oconomowoc get a few more weeks of grace. This guide is laid out in the order the work happens, from the shoreline in September to the last walk-through before you lock the door.

Late September: The Shoreline Comes Out First

Ice on a Wisconsin lake moves, heaves, and pushes with enough force to fold a pier and drag a boat lift a hundred feet down the shore. Seasonal piers need to come out before freeze-up, and on the northern lakes that means late September or the first two weeks of October. Southern lakes can wait until late October, but the water is no warmer for the job.

Pull the boat first and get it to storage or onto a trailer for its own winterizing. Then the lift, which usually comes out in sections and gets stacked above the high-water line.

Pier sections follow, and roll-in piers on wheels can be walked up the shore if the bank allows. Aluminum piers and lifts can be left on the ice only if the manufacturer says so and only on lakes that do not heave badly.

Pier services in the Northwoods and around Lake Geneva charge roughly $300 to $800 to remove a standard pier and lift, and many owners on bigger lakes like Minocqua, the Chippewa Flowage, or Lake Wisconsin book them a year in advance. If you do it yourself, do it with a second person and waders, and do it while the water is still above 50 degrees.

Early October: Draining the Plumbing

Everything that holds water inside the cabin has to be empty or protected with antifreeze. This is where the expensive failures happen, and it is worth writing the sequence down and taping it inside the utility room the first time you do it. A frozen fitting behind a wall in a Northwoods cabin can go unnoticed until the pump kicks on in May.

Start by shutting off the well pump at the breaker and opening every faucet, hot and cold, inside and out, so the system loses pressure. Open the low-point drains, usually near the pressure tank or at the lowest run of pipe in the crawl space. Most Wisconsin lake cabins built in the last 40 years were plumbed to drain by gravity, but older ones often have runs that trap water.

A small air compressor set at 40 to 50 psi, connected at a hose bib or a fitting near the pressure tank, pushes out what gravity leaves behind. Work from the farthest fixture back toward the compressor, and run each faucet until it blows dry air. Include the outdoor shower, the hose bibs, the dishwasher, and the washing machine lines.

The Well, Pressure Tank, and Softener

Drilled wells with a submersible pump sit below frost depth and do not need much beyond shutting off power. The pressure tank does need draining through its bottom valve, and the line from the well to the cabin should drain back through the pitless adapter. A sand point or shallow well with a jet pump needs the pump body drained through its plug, since a jet pump housing cracks if it freezes full.

Water softeners are common on Wisconsin lake properties because of the iron and hardness in Northwoods groundwater. Bypass the softener, drain it through the drain line, and pour RV antifreeze into the brine tank and the resin tank per the manufacturer's directions. A frozen softener is a $600 to $1,500 replacement.

Water Heaters

Shut off the breaker or the gas valve first. Then connect a hose to the bottom drain, run it outside or to a floor drain, and open a hot faucet somewhere in the cabin so the tank will drain. Leave the drain valve open and the hot side of the system open until spring.

Tankless units, which are increasingly common in newer Door County and Lake Geneva cabins, have their own drain plugs and a manufacturer procedure. Pull the manual before you start, since some need to be blown out and some need antifreeze.

Traps, Toilets, and Drains

Pour RV antifreeze, the pink plumbing-safe kind, into every P-trap: kitchen and bath sinks, showers, tubs, floor drains, and the washer standpipe. One cup per trap is plenty. Never use automotive antifreeze, which is toxic and will end up in your septic system and eventually in the lake.

Toilets get the most attention. Shut the supply, flush, sponge the tank and bowl nearly dry, then pour a quart of RV antifreeze into the bowl and a cup into the tank. A toilet that freezes with water in it cracks the porcelain, and replacing one runs $300 to $600 with a plumber's visit.

Septic Systems and Holding Tanks

Many Wisconsin lake lots sit on holding tanks or mound systems because the soil near shore does not perc. A holding tank should be pumped before closing so it does not sit full all winter and so you are not paying a pumper to come down an unplowed road in January. Pumping runs about $200 to $400 in most of the state.

Conventional septic tanks do not need a fall pumping and should be left alone unless they are due on their normal three-year cycle. Wisconsin counties require inspection or pumping on a schedule, so check your county's sanitary permit records. Mound systems benefit from a layer of straw or leaves over the mound in the north to keep the frost from driving deep.

Propane, Power, and the Furnace

Turn the propane off at the tank unless you are leaving heat on. Most Northwoods cabins run on propane for the furnace, the water heater, and the stove, and a closed tank valve is the simplest way to prevent a leak nobody notices for five months.

Shut off the main breaker unless you are leaving a freeze alarm, a sump pump, or a security camera running. If you keep power on for any of those, shut off every other breaker individually. Pull batteries from smoke detectors and remotes, since they leak in the cold.

The furnace itself needs nothing beyond being shut off. If it has a humidifier, drain it. Fireplaces and wood stoves should have the flue closed and the chimney capped so snow and squirrels stay out.

Food, Fabrics, and Mice

Empty the refrigerator and freezer completely, unplug them, wipe them out, and prop the doors open. Take every bit of food out of the cabin, including canned goods that can freeze and burst, coffee, spices, and anything in the pantry. Mice will find a single granola bar, and once inside they nest in mattresses, couches, and the insulation around the stove.

Wash and dry all bedding and store it in sealed plastic totes. Stuff steel wool into any gap larger than a pencil around pipes, vents, and the sill plate. Set a few snap traps in the kitchen and the utility room, and leave interior doors and cabinets open for airflow.

Leaving the Heat On for Winter Use

Plenty of Wisconsin cabin owners come up for ice fishing, snowmobiling, or Christmas, and a full drain-down makes that miserable. If the cabin is insulated and the heating system is reliable, the alternative is to leave the furnace at 50 to 55 degrees, install a freeze alarm that texts your phone, and have a neighbor or caretaker check after big storms.

The risk is a power outage or furnace failure during a stretch of 20-below nights, which happens in the Northwoods most winters. A propane furnace with a battery-backed thermostat and a 500-gallon tank topped off in November can ride out most outages, but the water lines in an unheated crawl space are still the weak point. Many owners split the difference: drain the plumbing, leave the heat on low, and bring in jugs of water for winter weekends.

If any of this is beyond what you want to handle yourself, a plumber who winterizes lake cabins can do the full drain-down for approximately $175 to $400 depending on the system, and most will bundle the spring startup. The rest of our Wisconsin blog has more seasonal guides for homeowners across the state.

Frequently Asked Questions

When should I pull my pier in Wisconsin?

On northern lakes, late September through mid-October, while the water is still above 50 degrees. Southern lakes can wait until late October, but freeze-up can come fast after that.

How much does it cost to have a cabin winterized?

A plumber typically charges $175 to $400 for a full drain-down with antifreeze in the traps. Pier and lift removal by a shore service runs another $300 to $800.

Can I leave water in the lines if I keep the heat on?

Only in a fully insulated cabin with a reliable furnace, a freeze alarm, and someone nearby to respond. Crawl-space plumbing in an older cabin will freeze in a January outage even with the furnace set to 55.

Do I need to pump the holding tank before winter?

Yes. A full holding tank sitting all winter is a problem, and getting a pumper down an unplowed road in February is worse. Have it pumped in October.

What kind of antifreeze goes in the toilet?

RV antifreeze rated for potable plumbing systems, the pink kind sold at hardware stores. Never use automotive antifreeze, which is toxic to your septic system and the lake.