8 Cold-Weather Boat Maintenance Tips and Reminders
By Debbie Hanson
Jan 13, 2025
When it comes to cold-weather boat maintenance, following a few helpful tips can save you time and money. In other words, by properly preparing your boat for winter storage, you’ll be able to get back out on the water faster when spring arrives.
Whether you’re storing your boat for the winter or while traveling for an extended period, your boat owner’s manual should be your first resource regarding best practices for boat winterization or long-term storage. Once you’ve referred to your owner’s manual, you can cross reference those guidelines with these cold-weather boat maintenance tips.
1. Winterize the Engine
One of the most critical boat winterization tips applies to protecting the engine. Freezing temperatures can cause water inside the engine block to expand, which leads to cracks and expensive repairs. One of the first essential steps for boat engine winterization is to flush the engine with fresh water to remove salt, dirt, and debris. Then, add antifreeze to the cooling system (use a marine-grade antifreeze with the appropriate freeze protection for your region). Finally, fog the engine with a fogging oil spray to protect internal components from rust and corrosion during storage.
2. Prepare the Fuel System for Cold Weather
To take care of fuel system winterization, which prevents fuel degradation and moisture accumulation, fill the fuel tank to minimize condensation. Add a fuel stabilizer to prevent fuel breakdown and gum formation. Then, run the engine briefly to circulate the stabilizer through the fuel system.
3. Battery Maintenance
Cold weather can drain batteries quickly. Fully charge your boat batteries one last time before storing them (this ensures they'll recharge next season and reduces the risk of the batteries freezing). Once the batteries are fully charged, disconnect them from the boat and store them in cool, dry place where you can check the charge periodically. Checking to be sure the batteries are holding a proper charge throughout the winter will extend the lifespan of the batteries.
4. Protect the Plumbing System
If your boat has a freshwater or head system, be sure to drain all water tanks, lines, and pumps to protect the plumbing system. Then, flush the system with marine antifreeze specifically designed for potable water systems.
5. Clean Your Boat Thoroughly
Before storing your boat, be sure to clean and inspect the hull and deck. Start by washing off any dirt, algae, and salt to prevent corrosion and staining. Check for cracks, blisters, or other damage that can worsen in freezing temperatures and repair any existing damage. Apply a coat of marine wax to protect boat hull from moisture and UV damage.
6. Cover Your Boat for Protection
A high-quality, breathable boat cover is essential for protection from snow, ice, and dirt. Choose a breathable cover to prevent mold and mildew. Make sure the cover fits snugly and is securely fastened to withstand gusty winter winds. If you plan to store your boat outdoors, use a boat cover support system to prevent snow accumulation that can stress the cover or cause damage the boat.
7. Inspect and Maintain Your Safety Gear
Winter is a great time to inspect your boating safety equipment and first aid kit. Replace any expired flares and fire extinguishers, inspect life jackets for wear and tear, and check your electronics (radios and GPS devices) to be sure they are in good working order. When inspecting your first aid kit, check the expiration dates on medications, and look for any damage to bandage or dressing packaging. Replace any items that are expired, damaged, or missing.
8. Conduct Regular Inspections When in Storage
Even with proper preparation, winter boat storage requires occasional checks. Look for signs of moisture, pests, or damage. Early detection can save you time and money when spring arrives.
By following these eight boat winterization tips and checking your owner’s manual, you’ll protect your investment and be ready to start making more memories on the water as soon as warmer weather returns.
