Spring Cottage Opening Checklist for Ontario: Everything You Need to Do

When to Open: Timing Matters More Than You Think

Most Ontario cottage owners target the May long weekend (Victoria Day) as their opening date. That works, but it also means every plumber, dock installer, and pest control company in Simcoe County is booked solid. If your property is winterized properly, there is no reason you cannot open as early as mid-April.

The key factor is overnight temperatures. You need consistent nights above -5 degrees Celsius before you commission the water system. In the Collingwood and Blue Mountains area, that typically happens between April 10 and April 25, depending on the year. Georgian Bay waterfront properties tend to run a week or two behind due to lake-effect cooling.

Opening early gives you the luxury of finding problems before the season starts. Discover a cracked pipe in mid-April and you have time to fix it. Discover it on the May long weekend and you are spending your holiday on the phone with emergency plumbers.

Water System Commissioning

The water system is the single most important part of your spring opening. A mistake here can mean thousands of dollars in water damage. Take your time with this one.

Step 1: Close All Drain Valves

Before you turn anything on, walk the entire property and close every drain valve that was opened during winterization. This includes the main drain, hot water tank drain, toilet supply valves, and any exterior hose bibs. If you used RV antifreeze in the fall, the drain valves will likely have pink residue around them, which makes them easier to find.

Step 2: Check the Pressure Tank and Pump

If your cottage has a well, inspect the pressure tank for any signs of damage or corrosion. Check the pressure gauge and ensure the tank has the correct pre-charge pressure (typically 28 to 38 PSI, but check your system specifications). For lake-water systems, inspect the intake line and foot valve before priming the pump.

Step 3: Slowly Pressurize the System

This is where most people rush and regret it. Turn on the main water supply slowly and listen. Walk the entire property while the system pressurizes, checking under every sink, around every toilet, and in the basement or crawl space. You are listening for hissing, dripping, or the sound of running water where there should not be any.

Step 4: Flush the Lines

Run every faucet, both hot and cold, for two to three minutes. This flushes out any remaining antifreeze and air pockets. Start with the faucet closest to the main supply and work your way to the furthest point. Flush all toilets twice. If the water comes out discoloured or has a strong odour, continue flushing until it runs clear.

Step 5: Hot Water Tank

Ensure the hot water tank is full before turning on the heating element or gas supply. Running a dry tank will burn out the element (electric) or damage the heat exchanger (gas). Open a hot water faucet and let it run until water flows steadily with no air sputtering, then turn on the tank. It will take 30 to 60 minutes to reach temperature.

Plumbing Inspection

With the water system running, do a thorough plumbing inspection. Winter is hard on pipes, even when properly winterized.

• Check all visible pipe joints for moisture or mineral deposits (white or green residue indicates slow leaks)
• Inspect under sinks, behind toilets, and around the washing machine connections
• Test all shut-off valves to confirm they actually shut off flow
• Run the dishwasher on an empty cycle to check for leaks in the supply and drain lines
• Check the sump pump by pouring water into the pit to trigger the float switch
• Inspect exterior hose bibs for freeze damage before connecting hoses

HVAC Startup

Your heating and cooling system has been sitting idle for months. Before you rely on it, take a few minutes to make sure it is ready.

Furnace / Heat Pump

• Replace the furnace filter (it should have been left clean in the fall, but check anyway)
• Inspect the furnace exhaust vent and fresh air intake on the exterior for animal nests or debris
• Turn the thermostat to heat mode and set it 2 degrees above current indoor temperature
• Let the system run for 15 minutes and check all vents for airflow
• A brief burning smell is normal on first startup (dust on the heat exchanger) but should clear within 10 minutes

Air Conditioning

Do not test the AC until outdoor temperatures are consistently above 16 degrees Celsius. Running the compressor in cold weather can damage it. For most Collingwood area properties, this means waiting until late May. Clear any debris from around the outdoor condenser unit and ensure at least 60 centimetres of clearance on all sides.

Exterior Walk-Around

Winter does a number on the outside of your property. A careful walk-around catches problems before they get expensive.

• Roof: Look for missing or lifted shingles, ice dam damage along eaves, and debris accumulation in valleys
• Gutters: Clear leaves and debris, check downspout connections, ensure water drains away from the foundation
• Foundation: Walk the perimeter looking for new cracks, heaving, or signs of water intrusion
• Siding: Check for loose or damaged panels, especially on the north and west faces where winter storms hit hardest
• Windows and doors: Check caulking and weather stripping, look for condensation between panes (seal failure)
• Deck and stairs: Test for soft or rotten boards, check railing stability, look for frost-heaved posts
• Trees: Look for dead branches hanging over the cottage or power lines, especially after heavy snow years

Dock and Waterfront

If you have a waterfront property on Georgian Bay or one of the inland lakes, the dock is a major spring project. The timing depends on ice conditions, which vary significantly year to year.

• Confirm the ice is fully out before installing any dock sections
• Inspect stored dock sections for rust, rot, or structural damage
• Check shoreline for erosion that may affect dock placement
• Install dock and test stability before putting furniture or boats on it
• Inspect boat lift or hoist mechanisms, lubricate moving parts

For a detailed dock guide, see our dock installation and removal guide for Georgian Bay.

Pest Check

An empty cottage is an invitation for wildlife. Mice, squirrels, raccoons, and carpenter ants are the most common offenders in the Collingwood and Blue Mountains area. The damage they cause over a single winter can range from a minor annoyance to a five-figure repair bill.

• Check attic and crawl space for droppings, nesting material, or chewed insulation
• Inspect electrical wiring for rodent chew marks (this is a fire hazard, not just a nuisance)
• Look for entry points: gaps around pipes, soffit damage, loose dryer vents, gaps under doors
• Check deck and porch undersides for skunk or raccoon dens
• Inspect wood framing, especially in damp areas, for carpenter ant damage (look for sawdust piles)

Security and Monitoring

If your cottage has a security system or IoT monitoring, spring opening is the time to verify everything is working.

• Test all door and window sensors by opening each one and confirming the alarm or notification triggers
• Replace batteries in wireless sensors, smoke detectors, and carbon monoxide detectors
• Verify WiFi connectivity and check that your monitoring hub is reporting to the cloud
• Test temperature and humidity sensors to confirm accurate readings
• Check security camera angles and clean lenses after winter grime
• Update any smart lock codes if they were shared with contractors over the winter

Interior Prep

Once the mechanical systems are running and the property is secure, it is time to make it liveable again.

• Open windows for at least 30 minutes to air out the property (musty smell is normal after months sealed up)
• Check all appliances: fridge, stove, microwave, dishwasher, washer and dryer
• Inspect for moisture damage on ceilings, around windows, and in closets
• Clean surfaces, vacuum, and mop before moving soft furnishings back in
• Stock essentials: toilet paper, cleaning supplies, first aid kit, flashlights with fresh batteries
• Check expiry dates on any food, sunscreen, or medications left from last season
• Test the barbecue: check propane tank level, inspect burners and hoses for damage or blockages

Quick-Reference Checklist

Here is the condensed version you can screenshot or print. We recommend doing these in order, as each step builds on the last.