How to Winterize Your Ontario Cottage (and Why It Matters for Coverage)

Every fall, Ontario cottage owners face the same to-do list: pull the boat, drain the dock, and close up the cottage. But while most people focus on the physical tasks of shutting down for winter, the insurance dimension of winterization is less well understood — and the consequences of doing it wrong can be significant.

Why Winterization Matters to Your Insurer

Most Ontario cottage insurance policies include a seasonal vacancy clause — a set of conditions that apply when your property is left unoccupied for an extended period. The most critical conditions almost always relate to winterization, because frozen and burst pipes are one of the most common and costly claims in cottage country.

If your pipes burst over the winter because the property wasn’t properly drained and winterized — and your policy has a condition requiring winterization — your insurer may deny the water damage claim, even if you have an active policy. The damage from a burst pipe in a vacant property left for months can be catastrophic: floors, walls, ceilings, contents, and structural components can all be affected by flowing water in a closed building.

The inverse is also true: a properly documented winterization protects you. If a claim does occur and you can demonstrate that you met your policy’s winterization conditions, the claim proceeds normally.

Step-by-Step Winterization Checklist

Plumbing — the most critical step:

• Shut off the main water supply at the wellhead, pump, or shutoff valve
• Open all taps (hot and cold) in every fixture and leave them open until they drain completely
• Flush toilets until the tank and bowl are empty, then add RV antifreeze to the toilet bowl and tank (non-toxic propylene glycol antifreeze, not automotive antifreeze)
• Drain the hot water tank — turn off the element or gas pilot, connect a hose to the drain valve, and let it drain completely
• Drain any pressure tank in the well system
• Add RV antifreeze to all drain traps — kitchen sink, bathroom sinks, tub, shower
• If you have an outdoor shower, drain the supply lines and leave the shutoff open
• Blow out lines with compressed air if your cottage has a complex plumbing system or you want additional certainty

Heating systems:

• If you have a propane or natural gas system, shut off the supply at the tank or meter
• If you leave electric heat on (for heat tape on water lines or frost protection), confirm the thermostat setting and ensure your insurer is aware
• Clean out the wood stove or fireplace and close the damper
• Empty any pellet stove hopper

Electrical:

• Turn off all breakers except those needed for frost protection, security systems, or sump pumps
• Unplug all appliances, including the fridge (prop the door open to prevent mould)

General securing:

• Remove or store valuables — laptops, cameras, seasonal jewellery
• Remove perishable food items completely
• Lock all windows and doors, including the boathouse and sheds
• If you have a security system, confirm it’s armed and functioning

Inspection Requirements During Vacancy

Some policies require periodic inspections of the property during the vacancy period — typically every 30 days. The inspector can be a neighbour, friend, property management company, or caretaker. What they’re generally looking for: signs of break-in, obvious water infiltration, fallen trees, or other visible damage.

If your policy has an inspection requirement, document each inspection — a text message or email from the neighbour confirming the visit, with any notes, is useful documentation.

When to Do It and Who Should Do It

Most insurance conditions don’t specify that a licensed plumber must perform the winterization — you can typically do it yourself. However, if you’re unsure about your plumbing system or if the cottage has a complex or aging system, having a plumber or property management service do the winterization and provide a receipt is solid documentation.

The timing question is practical: winterize before the first hard frost in your area. In Muskoka, Haliburton, and Parry Sound, hard freezes can arrive in October. Don’t wait until Thanksgiving weekend if you can avoid it.

Questions About Your Policy’s Specific Conditions

Vacancy clause conditions vary by insurer, and knowing exactly what yours requires before the fall is far better than finding out after a winter loss. Call Luca at 705-996-1116 to review your policy’s winterization conditions and confirm what’s required to keep your coverage intact over the off-season.

Related Reading

• What Happens If Pipes Freeze at the Cottage? — Quick answer on frozen pipe claims and coverage conditions
• Understanding Your Cottage Policy’s Seasonal Vacancy Clause — The policy conditions that make proper winterization essential
• Spring Cottage Checklist — What to inspect when you reopen after winter