how to winterize pontoon

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Mastering Winterization: A Comprehensive Guide to Prepare Your Pontoon for the Cold Months

Are you gearing up to bid farewell to the boating season and tuck your pontoon away for the winter? As the colder months approach, it’s crucial to embark on the process of winterization. Properly winterizing your pontoon boat is not only a matter of preserving its longevity but also a strategic move to prevent damage and ensure a seamless transition into the spring boating season.

Why Winterize Your Pontoon?

Winterizing your pontoon boat is not just a routine; it’s a pivotal step in safeguarding your investment. As temperatures drop, water trapped in various components of your boat can freeze and expand, posing a threat to the hull, engine, plumbing systems, and more. Additionally, neglecting proper care can lead to mold and mildew growth, corrosion, and a host of other issues.

By dedicating the time to winterize your pontoon, you’re essentially investing in its well-being, ensuring it emerges from winter’s grasp unscathed and ready for action.

Steps to Winterize Your Pontoon

1. Clean Your Boat Thoroughly:

Before diving into the winterization process, give your pontoon boat a meticulous cleaning session. Remove debris, dirt, and grime from both the exterior and interior of the boat. Pontoons, in particular, tend to accumulate a significant amount of grime, so pay extra attention to their cleanliness.

2. Perform Maintenance Tasks:

Following the cleaning phase, undertake any necessary maintenance tasks. This may involve changing the oil and oil filter, replacing spark plugs, checking and topping off fluids, and inspecting the boat’s electrical system. If these tasks are outside your comfort zone, consulting a professional mechanic for a pre-winter tune-up is a prudent move.

3. Drain and Flush the Engine:

Critical to the winterization process is draining and flushing the engine. Removing all residual water from the cooling system prevents potential damage due to freezing temperatures. This involves removing the drain plug and using a flushing kit or muffs to circulate a mixture of antifreeze and water through the engine.

4. Add Fuel Stabilizer:

As part of the fuel system preparation, add a fuel stabilizer to your gas tank. This safeguard prevents gasoline breakdown during the winter, averting potential damage to the engine. Adhere to the product instructions for the correct stabilizer quantity.

5. Consider Fogging the Engine:

Fogging, especially crucial for two-stroke engines, entails spraying fogging oil into the engine while it’s running. This coats internal components, protecting against corrosion during storage. If you’re not comfortable with this procedure, seeking professional assistance is advisable.

6. Drain and Clean the Water System:

Ensure your water system is thoroughly drained and cleaned. This includes removing any water from sinks, showers, and toilets. Use non-toxic antifreeze to flush out the water system, preventing freezing. Cleaning and disinfecting water tanks, along with filter replacement, contribute to a well-maintained plumbing system.

7. Protect Your Batteries:

Battery maintenance is paramount for winterizing your pontoon. Remove the batteries and store them in a cool, dry location. Consider keeping them on a trickle charger to maintain their charge throughout the winter.

8. Cover and Store Your Pontoon:

The final steps involve covering and storing your pontoon for the winter. Invest in a high-quality pontoon cover, ensuring it’s securely fastened with open vents to prevent mold and mildew. Opt for indoor storage if available; if storing outdoors, elevate your pontoon off the ground and provide proper support to prevent damage.

Winter Boat Maintenance Tips

Check on Your Boat Regularly:

Periodic checks during the winter are essential. Even in storage, your boat may face unforeseen challenges. Regular inspections allow you to detect and address issues early on.

Keep an Eye on the Weather:

After extreme weather events such as heavy snowfall or ice storms, check your boat for any adverse effects. Remove excess snow or debris from the cover and ensure it remains secure.

Don’t Forget About Your Trailer:

If your pontoon is on a trailer, extend your maintenance efforts to the trailer itself. Grease bearings, check tire pressure, and inspect for potential damage or rust.

Consider Professional Storage:

If you lack a suitable storage location or find maintenance tasks daunting, professional storage at a marina or boatyard is a viable option. Professionals can expertly care for your pontoon during the winter months.


Properly winterizing your pontoon is a meticulous process, but the rewards far outweigh the effort. By safeguarding your boat from potential damage and meticulously following these steps, you ensure that it emerges from winter hibernation in optimal condition. Remember to consult your owner’s manual for any model-specific winterization instructions. As the colder months set in, rest easy knowing that your pontoon is well-prepared for a rejuvenated boating season ahead. Happy winterizing!

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