
Winterizing your boat is an important procedure to prepare your boat for long-term storage during the cold months. It involves draining the boat of any water and replacing it with antifreeze to protect against extreme cold temperatures. This is particularly important if you live in a climate where the lake is annually covered by ice, as water trapped in an engine block, water tank or other on-board plumbing can cause significant and very expensive damage. Other steps include turning pillows and cushions on their sides to allow air circulation, and installing a humidifier or using a moisture and odour-absorbing product to avoid moisture and mildew during the off-season.
| Characteristics | Values |
|---|---|
| Reason | To prepare a boat for long-term storage |
| Water | Drain any water aboard or replace it with antifreeze |
| Freshwater tank/hot water heaters | Drain these systems and then run non-toxic antifreeze through them |
| Head | Empty the boat's holding tank at an approved waste facility |
| Pillows and cushions | Turn on their sides to allow air circulation |
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What You'll Learn

Drain freshwater tanks and hot water heaters
Winterizing a boat is the process of preparing it for long-term storage during the cold months. It is important to drain freshwater tanks and hot water heaters during the winterization process. This is because water trapped in an engine block, water tank or other on-board plumbing can cause significant and very expensive damage if it freezes.
To drain freshwater tanks and hot water heaters, first, make sure the tanks are completely empty. Then, run a non-toxic antifreeze through the systems. Turn on all faucets and showers and leave them running until you see the antifreeze running out. Add non-toxic antifreeze to the water heater as well.
Depending on where you are, you might not have an appropriate place to empty the head (if your boat has one). In this case, you should 'head' to an approved waste facility where you can safely empty the boat's holding tank.
Finally, turn pillows and cushions on their sides to allow air circulation. You can also install a humidifier or use a moisture and odour-absorbing product to avoid moisture and mildew during the off-season.
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Run non-toxic antifreeze through the systems
Winterizing a boat is the process of preparing it for long-term storage during the cold months. It is particularly important to winterize your boat if you live in a climate where the lake is likely to be covered by ice. If water is left in the engine block, water tank or other on-board plumbing, it can freeze and cause significant and expensive damage.
One of the key steps in winterizing your boat is to run non-toxic antifreeze through the systems. This includes the freshwater tank and hot water heaters, which should be completely drained before the antifreeze is run through. After draining, turn on all faucets and showers and let them run until you see the antifreeze running out. You should also add non-toxic antifreeze to the water heater.
If your boat has a head, you will need to find an appropriate place to empty the holding tank. This may be at an approved waste facility.
Other steps to winterize your boat include turning pillows and cushions on their sides to allow for air circulation and installing a humidifier or using a moisture and odour-absorbing product to avoid moisture and mildew during the off-season.
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Turn on faucets and showers
Winterizing a boat is the procedure completed for preparing a boat for long-term storage. It is important to drain your boat of any water aboard or replace it with antifreeze to protect against extreme cold temperatures. If you have a freshwater tank or hot water heaters, it is important to drain these systems and then run a non-toxic antifreeze through them.
After this, turn on all faucets and showers and let them run until you see the antifreeze running out. This is an important step to ensure that the antifreeze is running through the system and that the pipes are clear of water.
If your boat has a water heater, be sure to add non-toxic antifreeze to it as well. Depending on where you are working, you may or may not have an appropriate place to empty the head (if your boat has one). If not, you will need to "head" to an approved waste facility where you can safely empty the boat's holding tank.
Additionally, turn pillows and cushions on their sides to allow for air circulation. You can also install a humidifier or use a moisture and odour-absorbing product to avoid moisture and mildew during the off-season.
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Add antifreeze to the water heater
Winterizing a boat is the procedure completed for preparing a boat for long-term storage. This is especially important if you live in a climate where the lake is annually covered by ice, as water trapped in an engine block, water tank or other on-board plumbing can cause significant and very expensive damage.
If your boat has a freshwater tank or hot water heaters, it’s important to completely drain these systems during the boat winterization process. After draining, run a non-toxic antifreeze through the systems, then turn on all faucets and showers to run until you see the antifreeze running out.
Add non-toxic antifreeze to the water heater, too. This will protect the water heater from extreme cold temperatures. Depending on where you work through these winterization steps, you might or might not have an appropriate place to empty the head (if your boat has one). To complete this step, “head” to an approved waste facility where you can safely empty the boat’s holding tank.
To avoid moisture and mildew during the off-season, you can turn pillows and cushions on their sides to allow air circulation. You can also install a humidifier or use a moisture and odor-absorbing product.
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Turn pillows and cushions on their sides
Winterizing your boat is the process of preparing it for long-term storage during the cold months. This involves draining any water aboard and replacing it with antifreeze to protect against extreme cold temperatures. It's important to do this to avoid water becoming trapped in the engine block, water tank or other on-board plumbing, which can cause significant and expensive damage.
Turning pillows and cushions on their sides is an important part of winterizing your boat. This allows for air circulation and helps to avoid moisture and mildew during the off-season. You can also install a humidifier or use a moisture and odour-absorbing product to further prevent mildew.
To turn your pillows and cushions on their sides, first, remove them from the bed or seating area. If they are attached, you may need to unscrew or unhook them. Then, turn them on their sides so that the air can circulate. You may want to prop them up against something to ensure they stay in this position.
It is also important to clean your pillows and cushions before storing them. This will help to remove any dirt, dust or grime that has built up over the season. You can use a mild detergent and warm water to clean them, and then ensure they are thoroughly dried before storing them.
Finally, you should store your pillows and cushions in a dry, well-ventilated area. This will help to prevent mould or mildew from forming. You may want to consider using a storage bag or container to keep them clean and protected.
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Frequently asked questions
Winterizing a boat involves draining any water aboard and replacing it with antifreeze to protect against extreme cold temperatures. This includes draining freshwater tanks and hot water heaters and running non-toxic antifreeze through the systems. It's also important to turn pillows and cushions on their sides to allow air circulation and avoid moisture and mildew.
Winterizing a boat is important to prepare it for long-term storage. If left to freeze, water trapped in an engine block, water tank or other on-board plumbing can cause significant and very expensive damage.
When you de-winterize a boat, a technician will run a full system check to verify that the engine, electronics, stereo and ballast systems are working properly. This involves replacing all the antifreeze in the system with raw water. Any ballast bags that were drained and rolled during winterization are reattached and repositioned.











































