Closing your Ontario cottage for the winter is more than a chore; it’s an act of stewardship for a major investment.

The province’s brutal winters can inflict severe damage on an unprepared property. 

This guide provides a step-by-step process to prevent costly repairs and ensure your cottage is secure until spring.

Fortifying Your Cottage Exterior

Your cottage’s exterior is the first line of defence. 

These tasks are fundamental to protecting the entire structure, preventing water damage, and deterring pests.

Roof and Gutter Integrity

Your roof and drainage system must be flawless before the first snow.

• Visually inspect the entire roof for damaged, loose, or missing shingles. These are entry points for water as snow and ice build up.
• Look for sagging spots that signal structural weakness under the stress of heavy snow.
• Completely clear all leaves and debris from gutters and downspouts. This is one of the most critical autumn tasks. Clogged gutters are the primary cause of destructive ice dams.
• Ensure downspouts direct water far from the foundation to prevent flooding during the spring thaw.

Sealing the Building Envelope

Airtightness is key to energy efficiency and pest control.

• Walk the perimeter of your cottage and hunt down every crack, gap, and hole in the siding, foundation, and around utility lines.
• Seal every opening with high-quality exterior caulk or expandable foam. A mouse can squeeze through a dime-sized hole.
• Pay special attention to the seals around windows and doors.
• Replace any worn or damaged weather stripping to kill drafts.
• For extra protection, consider installing storm windows or applying insulation film.
• In harsh areas, board up windows with plywood for the ultimate defence against storm debris and break-ins.

Defensive Landscaping

Fall yard work is a core part of your pest management strategy.

• Trim all tree branches so they are at least six feet away from the cottage. Pests like squirrels and raccoons use these branches as highways to your roof.
• Clear the area around the foundation of all debris, including leaves, brush, and rock piles. These features provide “harborage,” or safe zones, for rodents to nest.
• Stack firewood at least 20 to 30 feet away from the cottage walls, as it is a major pest magnet.

Winterizing Your Cottage Water Systems

Mishandling your cottage’s plumbing is the fastest way to a winter catastrophe. 

A single mistake here can lead to burst pipes and devastating water damage. 

Water expands when it freezes, exerting enough pressure to rupture metal and plastic pipes alike. 

Follow these steps meticulously and in order.

The Main Water Shut-Off

Everything starts here.

• Locate and turn off the main water supply valve.
• If you have a well, shut off the circuit breaker that powers the pump.
• If you draw water from a lake, pull the pump and intake lines completely out of the water and store them indoors.

Draining Every Pipe and Fixture

With the water supply off, you can now drain the system.

• Open every faucet, starting with the highest one in the cottage and working your way down to the lowest. Gravity will help pull water through the system.
• Leave all faucets in the open position for the winter to prevent pressure buildup from any residual water that might freeze.
• Flush every toilet repeatedly until the tank is empty.
• Use a sponge or a wet/dry vacuum to remove the last bit of water from both the tank and the bowl.
• For a truly bulletproof draining, use an air compressor to blow compressed air through the lines. This forces out water trapped in low spots that gravity can’t clear.

Preparing Water-Using Appliances

Your appliances are part of the plumbing system and need individual attention.

Missing even one of these can be as costly as a burst pipe.

• Completely drain the hot water tank.
• Before draining an electric water heater, turn off its dedicated breaker to prevent the element from burning out.
• For a gas heater, turn off the pilot light and close the gas supply valve.
• Disconnect the hot and cold water hoses from your washing machine and run a final drain cycle to clear its internal pump.
• Drain the dishwasher’s supply line.
• Don’t forget the water line for any refrigerator with an ice maker or water dispenser.

The Strategic Use of Antifreeze

Plumbing antifreeze is not for your pipes

It’s for your drains. 

The P-traps—the U-shaped pipes under every sink and shower—are designed to hold water to block sewer gases and cannot be fully drained. 

To protect them:

• Pour about one cup of non-toxic RV/marine antifreeze down every drain and into the toilet bowl.
• Use only RV/marine-grade antifreeze, as it’s safe for potable water systems.
• Pour some into the bottom of the washing machine and dishwasher to protect their pumps.

Sump Pump and Septic System Care

Your sump pump is your spring thaw hero.

Don’t unplug it. 

It’s needed to handle melting snow and rising groundwater.

• Test the pump by pouring a bucket of water into the sump pit to ensure it activates.
• Detach the exterior drainage hose for the winter to prevent ice from creating a blockage that would back up water into your basement.
• If your septic system is due for service (most tanks need pumping every four to six years), have it pumped in the fall before closing.
• Add approved septic bacteria to help break down waste over the winter.
• Never add antifreeze to the septic tank itself.

Powering Down Your Cottage: Heat, Electricity, and Propane

Managing your cottage’s energy systems involves a crucial decision about heat and key safety steps for your electrical and propane systems.

The Key Decision: Heat On vs. Heat Off

You must choose: leave the heat on low or turn it off completely. 

Leaving the heat on at a maintenance temperature of 10°C to 13°C (55°F) provides a significant safety margin against freezing. 

It protects against any imperfections in your plumbing and reduces interior frost. 

If you leave the heat on, open cabinet doors under sinks to let warm air circulate around the pipes.

Turning the heat off saves money on energy bills but leaves zero room for error. 

This approach demands absolute certainty that every drop of water has been drained or treated with antifreeze. 

Before deciding, check your insurance policy, as some insurers have specific heating requirements for vacant properties.

Feature	Heat ON (Set to 10-13°C)	Heat OFF (Complete Shutdown)
Cost	Higher ongoing hydro/propane costs throughout the winter.	Significant energy cost savings.
Pipe Freeze Risk	Low. Provides a crucial buffer against freezing, protecting any missed water in pipes.	High. Requires flawless, 100% complete draining of all water systems—no margin for error.
Moisture/Frost	Reduces interior frost buildup and moisture issues caused by temperature fluctuations.	It can lead to frost on interior walls and windows. May increase dampness and risk of mildew.
Pest Deterrence	A cold but not freezing interior is still less attractive to pests than a completely unheated space.	An icy, dark interior can be very inviting for rodents seeking shelter.
Effort Required	Less demanding plumbing winterization is needed, but still requires draining.	Requires the most thorough and meticulous draining process possible, including blowing out lines.
Insurance	Often preferred or required by insurance companies for vacant properties.	May not comply with some insurance policies. You must verify coverage requirements.

Preparing Your Furnace or Wood Stove

Regardless of your heating decision, the system itself needs preparation.

• Get your furnace or wood stove professionally inspected and serviced in the fall.
• Replace the furnace filter.
• For a wood stove or fireplace, have the chimney professionally cleaned to remove flammable creosote, a serious fire hazard.
• Close the damper or flue tightly to block cold drafts and prevent small animals from using the chimney as an entrance.

A Smart Electrical Shutdown

Don’t just flip the main breaker. 

This will disable essential systems like your sump pump, security alarms, and motion-sensor lights. 

Instead, take a targeted approach.

• Unplug all major appliances like the stove, microwave, and washer to protect them from power surges and eliminate phantom power draw.
• For extra safety, switch off the individual circuit breakers for these non-essential appliances and any baseboard heaters, leaving the circuits for the sump pump and security system active.
• After removing all food, defrost and clean your refrigerator and freezer.
• Wipe the interiors dry and, most importantly, prop the doors open for the winter. This allows air to circulate and prevents foul-smelling mould and mildew from growing.
• Place an open box of baking soda inside to absorb any lingering odours.

Propane Tank Safety

Large propane tanks are built for winter and do not need to be covered. 

Your job is to keep them visible and accessible.

• Mark the tank’s location with a tall, brightly colored stake so snowplow operators can see it and delivery drivers can find it.
• When clearing snow from around the tank, use a broom or plastic shovel to avoid damaging the equipment.
• Disconnect smaller BBQ-style tanks and store them upright in a secure, well-ventilated location like a shed—never inside the cottage.
• Ensure the valve on any stored tank is fully closed.

Making Your Cottage Interior Uninviting to Pests

With the exterior sealed, your next goal is to make the cottage interior as unappealing as possible for pests. 

This means a zero-tolerance policy for food and nesting materials.

Remove All Food—No Exceptions

The most effective way to prevent a pest infestation is to remove every single food source.

• Remove all perishables from the fridge and freezer.
• Remove all dry goods from cupboards, as rodents can easily chew through boxes and bags.
• Remove even canned goods, which can freeze, burst, and create a mess that attracts pests.
• Take out all garbage, recycling, and other attractants like scented candles and soap.

Deep Clean to Deter

Your final deep clean is a critical pest-proofing step.

• Wipe down all kitchen surfaces to remove grease and food residue.
• Clean every crumb from toasters, ovens, and microwaves.
• Thoroughly sweep and vacuum all floors. This removes the tiny food particles that can sustain pests for months.
• At the same time, remove fire hazards like stacks of old newspapers or oily rags.

Secure Nesting Materials

Once food is gone, pests will seek materials for nesting. The stuffing in mattresses and sofas is a prime target.

• Cover all mattresses and upholstered furniture with thick plastic sheeting.
• Launder all bedding, towels, and clothing, then store them in sealed, rodent-proof plastic bins.
• For extra deterrence, place mothballs or strongly scented dryer sheets in drawers and closets.

Interior Defences

While the main battle is fought outside, add a second line of defence inside.

• Seal any interior gaps where pests could move from walls into living spaces, such as around pipes under sinks, using caulk or steel wool.
• Fix any plumbing leaks to remove water sources that attract pests like cockroaches.
• Set mouse traps in key areas like the kitchen to monitor for and control any pests that breach your defences.

Securing Your Cottage’s Outdoor Spaces

The winterization process extends to your docks, boats, boathouses, and outdoor furniture, all of which are vulnerable to damage from ice and snow.

Protecting Docks and Decks

Ice shove—the immense pressure of moving and expanding ice—is the enemy of your dock. 

The right strategy depends on your dock type.

• For removable docks (sectional or roll-in): The only safe option is to pull them completely out of the water. Store the sections on a flat, dry surface on shore.
• For permanent docks: You need to actively protect them. A de-icer or bubbler system circulates water around the posts, preventing thick ice from forming and crushing the structure.
• For floating docks left in the water: Loosen the anchor chains to allow the dock to rise and fall with water levels. If possible, move it to a sheltered bay where ice movement is less severe.
• For all docks: Remove and store accessories like ladders, benches, and lights.

Storing Boats and Watercraft

Pull all watercraft from the water for the winter.

• Winterize a motorboat engine by draining the cooling system of water and filling it with marine antifreeze to prevent the engine block from cracking.
• Treat the fuel with a stabilizer and change the oil.
• Thoroughly clean the boat to prevent mould and remove all cushions, electronics, and personal items.
• Cover the boat with a heavy-duty tarp or have it professionally shrink-wrapped.
• Store smaller craft like canoes and kayaks upside down on sawhorses, off the ground.
• For security, they can be chained and locked.

Preparing Patio Furniture and Equipment

• Clean all outdoor furniture meticulously and let it dry completely before storage to prevent mould, mildew, and rust.
• Different materials may need a protective coating, like wax for wicker or oil for wood.
• The best solution is to store all furniture in a locked shed or garage.
• If it must stay outside, use high-quality, fitted, waterproof covers.
• Clean your BBQ, disconnect the propane tank, and store both in a protected area.
• Drain or stabilize the fuel in gas-powered equipment like lawnmowers before storing them.

Addressing Ontario's Biggest Winter Threats

Ice dams and heavy snow loads are two of the most destructive winter forces in Cottage Country. 

Both require proactive strategies to prevent severe structural damage.

Winning the War Against Ice Dams

Ice dams are an attic problem, not a roof problem. 

They form when heat escapes from your living space into the attic, melting snow on the roof from underneath. 

This water flows down to the cold eaves, where it refreezes into a dam. 

The permanent solution is to keep your attic as cold as the outside air. 

This requires three steps:

1. Air Seal: Seal every air leak between your warm living space and the cold attic, including gaps around light fixtures, plumbing stacks, and the attic hatch.
2. Insulate: Ensure the attic floor is heavily insulated (R-60 is the standard in Ontario) to stop heat from conducting through the ceiling.
3. Ventilate: A balanced system of soffit and ridge vents allows cold air to circulate through the attic, flushing out any warm air that gets in.

As a temporary fix, you can use a roof rake to pull snow off the first few feet of the roof edge after each storm, but this only treats the symptom, not the cause.

Managing Heavy Snow Load on Your Roof

Heavy, wet snow can place an enormous load on a cottage roof, potentially causing it to collapse. 

The danger isn’t just about depth.

It’s about the weight of the snow, which depends on its density and your roof’s design. 

Warning signs of excessive load include interior doors that stick, new cracks in drywall, and creaking sounds from the attic. 

For a vacant cottage, the only effective strategy is to arrange for periodic snow removal.

• You can do this yourself with a roof rake, always leaving a few inches of snow to avoid damaging the shingles.

A more practical solution is to hire a local, insured contractor in the fall to monitor and clear the roof as needed throughout the winter.

Final Steps and Peace of Mind

The final tasks involve securing your property from human threats, confirming your insurance obligations are met, and conducting one last, meticulous walk-through.

Security for a Vacant Property

An empty cottage is a target for thieves. 

Use a layered security strategy.

• Remove the incentive: Take all valuables, including electronics, tools, alcohol, and firearms, off the property.
• Harden the target: Securely lock all doors and windows on all buildings and close the blinds.
• Create an illusion of presence: Put interior and exterior lights on random timers and arrange to have the driveway plowed after storms.
• For the highest level of security: A monitored alarm system or smart home cameras provide remote monitoring and true peace of mind.

Insurance and Your Obligations

Your winterizing efforts are part of your insurance contract. 

Before you leave, review your policy or speak with your broker. 

Many insurers have mandatory requirements for vacant properties, such as regular check-ins by a designated person, a monitored alarm, or keeping the heat on. 

Failure to comply with these terms can void your coverage and lead to a denied claim.

The Final Walk-Through

Before you lock up for the season, do one last sweep with a checklist in hand. 

This is your final chance to catch a missed step.

• Confirm every door and window is locked.
• Verify all faucets are in the open position.
• Double-check that appliances are unplugged and fridge/freezer doors are propped open.
• Take photos or video of the cottage’s condition for your records.
• Ensure a trusted neighbour or key-holder has a spare key and your contact info.
• Consider notifying the local police (OPP) detachment of your vacancy dates.
• Activate the security system as you leave.

Completing this final check allows you to leave with confidence, knowing your cottage is fully prepared for the long Ontario winter.

Renovate Your Cottage Now for a Worry-Free Winter

This guide shows that Ontario’s brutal winters are a major threat. 

Closing your cottage properly is the first step. 

But is your cottage’s structure truly ready for the fight? 

Heavy snow can test your roof’s strength. 

Heat loss from your attic creates destructive ice dams. 

Small cracks and gaps let cold air and pests inside. 

These structural problems require professional renovations. 

Our renovation services can help strengthen your cottage for the foreseeable future.

Don’t just manage winter problems each year. 

Let us provide a permanent solution. 

Schedule a FREE consultation to make your cottage truly winter-proof.