Avalon Pontoon Winter Storage Guide | Protect Flooring, Seats, Batteries & Electronics
The last boat of the season just got pulled from the water, and as you look at your Avalon sitting on the trailer, you realize — what you do in the next few hours will determine whether your boat looks brand new or beat up when spring arrives.
TL;DR: Winter storage isn’t just parking your boat and forgetting about it. It’s a process. The right steps protect your Premium Marine Vinyl Seating from cracking, your Non-Slip Marine Flooring from mildew, your batteries from freezing, and your electronics from corrosion. This guide covers everything: cleaning inside and out, engine prep, battery removal (or maintenance), cover options (shrink wrap vs. mooring covers — and why mooring covers are NOT for winter), pontoon support, and pest prevention. Follow these steps, and your Avalon will wake up in spring ready to go — no surprises, no expensive repairs.
Key Takeaways:
- Your mooring cover CANNOT be used for winter storage — it won’t handle snow load and will tear
- Indoor storage is best — shrink wrap is the next best option for outdoor storage
- Fully charge batteries before disconnecting — store them off the concrete floor in a cool, dry place
- Remove EVERYTHING from storage compartments — life jackets, towels, and gear hold moisture that creates mildew
- The boat MUST be bone dry before covering — any moisture trapped inside will turn into mildew over winter
- Remove rear drain plugs during storage — this prevents pressure damage from temperature changes
Why Winter Storage Isn’t Optional (It’s Critical)
Here’s the thing about avalon pontoon boats — they’re built with high-end materials that last for decades with proper care. But winter is brutal on those materials. Freezing temperatures, snow loads, trapped moisture, and hungry rodents don’t care how much you paid for your boat.
The difference between a boat that’s properly winterized and one that’s just “parked” is thousands of dollars in repairs. Cracked upholstery. Mildew-stained flooring. A frozen engine block. Corroded electronics. A bent railing from snow load. These are all preventable with a weekend of work before storage.
One experienced boater put it bluntly: “If you live where the windchill hits -50 degrees, wise prep each winter is prudent.”
Have you ever opened your boat in spring to find musty smells, cracked vinyl, or a dead battery? That’s what happens when winter storage is an afterthought.
Phase 1: The Deep Clean (Before Anything Else)
You can’t protect a dirty boat. Dirt holds moisture. Moisture creates mildew. Mildew destroys surfaces. Start with a thorough cleaning — inside and out.
Exterior Cleaning
Wash your boat’s exterior thoroughly with marine-safe soap. Remove all dirt, algae, and any salt residue if you boat in brackish or salt water . Pay special attention to the Reinforced Aluminum Pontoons — any organic material left on them can stain or corrode over the winter.
Pro tip: This is also a great time to apply a protective polish or wax to the exterior surfaces. The polish adds an extra guard against dirt and corrosion during the months of storage .
Interior and Flooring
Remove EVERYTHING from your boat. Life jackets, wakeboards, fishing gear, towels, sunscreen bottles, half-eaten snacks — all of it . These items hold moisture, and that moisture has nowhere to go in a covered, stored boat. Mildew loves nothing more than a damp life jacket sitting in a dark compartment for five months.
Vacuum the Non-Slip Marine Flooring thoroughly. Wipe down all surfaces with a mild cleaner . Then — and this is critical — let everything dry completely. Your Premium Marine Vinyl Seating needs to be bone dry before you close any compartments or install any covers .
Pro tip: Leave seat compartments and storage hatches OPEN for at least 24 hours after cleaning to ensure no trapped moisture remains .
Does your boat still have last season’s sunscreen bottles rolling around in a compartment? Take them out now — they’ll leak and stain over winter.
Phase 2: Engine and Fuel System Prep
Your outboard needs attention before winter. Don’t just tilt it up and walk away.
Fuel System
Fill your fuel tank at least three-quarters full before storage. An empty tank leaves room for condensation as temperatures fluctuate, and water in your fuel is a nightmare come spring . Add a quality fuel stabilizer to the tank — Mercury, Star Tron, or Stabil all work well. Run the engine for a few minutes to circulate the stabilizer through the entire fuel system .
Fogging the Engine
For long-term storage, spray fogging oil down the spark plug holes and into the carburetor or intake . This coats internal engine components with a protective oil film that prevents rust during the months of inactivity. Check your engine owner’s manual for specific instructions — different outboards have different procedures.
Oil Change
Winter is the perfect time to change your engine oil and replace the oil filter . Old oil contains contaminants that can settle and cause damage over time. Fresh oil means a fresh start in spring.
Does your engine owner’s manual have specific winterization steps? Find it now — don’t guess.
Phase 3: Battery Storage — The Right Way
Batteries are one of the most commonly damaged items during winter storage. Cold kills batteries that aren’t properly maintained.
Remove and Store
Disconnect your batteries and remove them from the boat . Store them in a cool, dry place — NOT directly on a concrete floor. Place them on a piece of wood or a shelf. Concrete can discharge batteries over time.
Keep Them Charged
Fully charge your batteries before storage . Then maintain that charge throughout the winter. You have two options:
- Connect them to a smart maintenance charger (battery tender) that automatically switches to float mode
- Check voltage monthly and recharge as needed
One experienced owner shares: “Once, maybe twice, I will go out in the middle of the winter to put all batteries on a charger. They always have maintained a full charge, and indicate such within a minute.”
What About Leaving Batteries in the Boat?
If you store your boat indoors in a climate-controlled space, you can leave batteries onboard. But for most owners, removal is safer. The one exception: if your boat is stored in the water (not recommended for winter), leave the battery connected to power the bilge pump .
Are your batteries still in the boat from last season? That’s why they didn’t last as long as they should have.
Phase 4: Electronics Protection
Your fish finder, GPS, stereo, and other electronics are sensitive to cold and moisture.
Remove What You Can
Take portable electronics — fish finders, GPS units, VHF radios — off the boat and store them indoors . Keep them in their original boxes or in a dry, temperature-controlled space. Add silica gel packets to the storage area to absorb any ambient moisture .
Protect Fixed Electronics
For electronics that can’t be removed (like your stereo head unit or fixed gauges):
- Clean screens and surfaces with a marine-safe electronics cleaner and microfiber cloth
- Spray electrical connections with a corrosion inhibitor
- Cover exposed connectors with dielectric grease or weatherproof caps
One owner stores “seven liquid crystal sonars stored in their original boxes, rods and reels with drags loosened, Noco battery jump starter, fire extinguishers, head lamps” all indoors for the winter.
Did you know that temperature fluctuations cause condensation INSIDE your electronics? That’s why indoor storage matters.
Phase 5: Covering Your Boat — The Most Critical Decision
This is where most pontoon owners make their biggest mistake. Listen carefully.
Your Mooring Cover is NOT for Winter Storage
Repeat that. Your mooring cover — the one you use during the summer to keep sun and dirt off — CANNOT be used for winter storage . It is NOT designed to handle snow loads. Period.
The Avalon technical manual is crystal clear: “Your mooring cover cannot be used for storage during the winter months. Your cover is intended to help reduce the effects of sun and dirt. It cannot withstand a snow load.”
If you use your mooring cover for winter storage, snow will accumulate. The weight will press down. And that pressure can damage your wall railings, windshield, and other components . Your warranty will not cover this damage — wind and rain damage are explicitly excluded .
Your Winter Storage Options
Option 1: Indoor Storage (Best)
Inside storage provides the greatest preservation of quality . A heated garage is ideal, but any enclosed space that keeps snow, ice, and rodents out works. Indoor storage also means you don’t need a heavy-duty winter cover.
Option 2: Shrink Wrap (Good for Outdoor Storage)
If indoor storage isn’t available, have your boat professionally shrink-wrapped . Shrink wrap provides a tight seal against moisture, dirt, and pests, and it can withstand heavy snow and ice . Your Avalon dealer can do this for you.
Option 3: Custom Heavy-Duty Storage Cover (Alternative)
If you prefer a reusable cover, contact your dealer about a custom storage cover made by a local canvas maker . These are built specifically to handle snow loads — unlike your mooring cover.
If You Must Use a Tarp
Use a heavy-duty tarp or cover designed for winter storage. Secure it well so wind doesn’t blow it off . Check periodically for snow accumulation — remove snow before it builds up and causes damage.
What cover is on your boat right now? If it’s your summer mooring cover, take it off immediately.
Phase 6: Pontoon Support and Drain Plugs
Your pontoon tubes need proper support during storage.
Support Points
If you’re storing your boat on blocks (not on a trailer), each pontoon needs a minimum of 3 support points spaced evenly along the tube. Each support block should be at least 4 feet long and run fore and aft .
Remove Drain Plugs
Remove the rear drain plugs from each pontoon tube during storage . This allows any condensation or trapped water to escape. More importantly, it equalizes pressure inside the tubes as temperatures drop. Extreme temperature drops can create a vacuum inside sealed pontoons, potentially causing damage .
Do you know where your pontoon drain plugs are located? Find them before you put the boat away.
Phase 7: Pest Prevention
Mice and other critters love stored boats. They chew wires, nest in upholstery, and leave droppings everywhere.
Seal Entry Points
Walk around your boat and look for any gaps or openings where mice could enter. Pay attention to:
- Where wiring passes through walls
- Gaps around the steering cable
- Openings in the motor well
- Any holes in the deck or flooring
Use Deterrents
Place dryer sheets, mothballs, or fresh cab in and around your boat . Some owners swear by Irish Spring soap shavings. Place these in storage compartments, under seats, and near potential entry points.
One owner notes: “The boats stay in the unheated boat garage under cover, with laundry sheets, just in case of mice.”
Keep the Area Clean
Don’t store food or anything edible in or near your boat. Remove all crumbs, spilled drinks, and food wrappers during your pre-storage cleaning.
Have you ever found mouse nests in your boat in spring? It’s a nightmare to clean. Prevent it now.
Phase 8: Winter Storage Checklist Summary
Here’s everything you need to do, in order:
Cleaning:
- Wash exterior with marine soap
- Vacuum and wipe down all interior surfaces
- Remove all gear, towels, life jackets, and food
- Let everything dry completely (24+ hours with compartments open)
Engine and Fuel:
- Fill fuel tank 3/4 full
- Add fuel stabilizer and run engine
- Spray fogging oil into cylinders
- Change oil and filter
Batteries:
- Fully charge
- Disconnect and remove from boat
- Store on wood shelf in cool, dry place
- Maintain charge over winter (tender or monthly recharge)
Electronics:
- Remove portable electronics and store indoors
- Clean and protect fixed electronics
- Apply corrosion inhibitor to connections
Covering:
- DO NOT use mooring cover
- Use indoor storage, shrink wrap, or custom winter cover
- Ensure cover is secure and ventilated
Pontoons:
- Remove rear drain plugs
- Support properly if not on trailer
Pest Prevention:
- Seal entry points
- Place deterrents (dryer sheets, mothballs)
- Remove all food sources
Final Check:
- Inspect everything one more time
- Take photos of your boat for insurance purposes
- Note any repairs needed for spring
Winter Storage Options Comparison
| Storage Method | Protection Level | Cost | Best For |
|---|---|---|---|
| Indoor (heated garage) | Excellent | Highest | Maximum preservation, frequent winter access |
| Indoor (unheated barn/warehouse) | Very Good | Moderate-High | Protection from snow and pests, no heat needed |
| Shrink Wrap (outdoor) | Good | Moderate | Boats stored outside, heavy snow areas |
| Custom Winter Cover | Good | Moderate-High | Reusable, fits your boat exactly |
| Mooring Cover | NOT ACCEPTABLE | N/A | Summer use only — will fail under snow load |
The Avalon manual is clear: “Storage should be indoors or under plastic shrink wrap if stored outdoors.”
What NOT to Do During Winter Storage
Don’t use your mooring cover. Already covered — but worth repeating. Snow loads will tear it and may damage your boat.
Don’t store with wet cushions or flooring. Mildew will form and it’s nearly impossible to remove. Let everything dry completely before covering .
Don’t leave food or crumbs onboard. You’re inviting rodents to make your boat their winter home.
Don’t store batteries on concrete. Concrete can discharge batteries over time. Use a wooden shelf or board.
Don’t forget to remove drain plugs. Trapped water can freeze and expand, damaging your pontoons from the inside .
Don’t let snow accumulate on shrink wrap. Even shrink wrap can be damaged by heavy ice buildup. Check periodically and remove snow when needed .
What’s the one thing you forgot last winter? Write it down and don’t repeat the mistake.
Spring Preparation: What to Do When Winter Ends
Proper winterization makes spring commissioning easy. When the ice melts, here’s what you’ll do :
- Remove the tarp or shrink wrap
- Reconnect spark plug wires
- Flush antifreeze (if you had it in your engine)
- Replace the battery and test the engine
- Check water pump and thermostat
- Inspect all cables and hoses
- Check for worn belts
- Test all electronics
- Inspect pontoons for any damage
- Clean and condition vinyl seating
Do you have a spring checklist saved somewhere? Create one now while winterization is fresh in your mind.
FAQ: Winter Storage Questions Answered
What makes Avalon pontoon boats different for winter storage?
Avalon’s Reinforced Aluminum Pontoons require proper support (3 points per tube) and drain plug removal. The owner’s manual has specific storage instructions that must be followed .
Can I store my pontoon outside with just a tarp?
Yes, but you need a heavy-duty tarp secured properly, and you must check it regularly for snow accumulation. Shrink wrap is better .
How often should I check on my boat during winter?
At least monthly. Check for snow accumulation on the cover, signs of pests, and any moisture inside .
Should I remove my boat’s propeller for winter?
Not necessary, but inspect it for damage while the boat is stored. Replace any bent or nicked props before spring .
What about the livewell and plumbing?
Drain all water from livewells, freshwater tanks, and any other plumbing. Run non-toxic antifreeze through the systems .
Can I leave my boat in the water over winter?
Not recommended for most climates. Ice expansion can crush pontoons. If you must leave it in, leave the battery connected to run the bilge pump .
How do I prevent my vinyl seats from cracking in cold?
Clean and condition them before storage. The conditioner keeps the vinyl flexible even in cold temperatures. Also, ensure no moisture is trapped against them.
Your Winter Storage Action Plan
Here’s your timeline for the next few weeks:
This weekend:
- Deep clean everything — inside, outside, and underneath
- Remove all gear and store indoors
- Let the boat dry completely with compartments open
Next weekend:
- Service the engine (fuel stabilizer, fogging oil, oil change)
- Remove and charge batteries
- Remove drain plugs from pontoons
- Apply conditioner to vinyl seating
Before first snow:
- Install proper winter cover (shrink wrap or custom cover)
- Place pest deterrents throughout the boat
- Take final photos for insurance
- Set calendar reminders to check on the boat monthly
Safety reminder: Never run your engine indoors or in an enclosed space — carbon monoxide is deadly. Always winterize your engine in a well-ventilated area.
Winter storage isn’t glamorous. It’s not why you bought a pontoon. But it’s the difference between a boat that lasts 5 years and a boat that lasts 20 years. Take the time. Do it right. Your future self — the one launching on that first warm day of spring — will thank you.
What’s your favorite Avalon boat feature or on-the-water experience? Share your thoughts in the comments below.
References:
- Avalon Pontoon Boats – Maintenance Tips (Winter Storage)
- Pontoon & Deck Boat Magazine – Winterization Checklist
- Avalon Technical Manual – Storing Your Pontoon Boat
- BoatsGeek – Winter Pontoon Boat Storage Guide
- BoatNews – Winterizing Boat Electronics
- Oria Marine – Cleaning and Protecting Onboard Electronics
- Avalon Pontoon Boats – How to De-Winterize
