The snowbird's guide to leaving a boat in Florida for the summer

Most boats around John's Pass don't get damaged on the water. They get damaged sitting still from May to October while the owner is in Michigan or Ontario. A Florida summer is the hardest six months your boat will face all year — daily thunderstorms, 90-degree water, relentless humidity, and hurricane season on top of it — and it does all of that with nobody watching. Here's what actually goes wrong, what to do before you fly north, and the one thing that matters more than any product you can buy.

What a Florida summer does to an unattended boat

None of this is dramatic. It's slow, and that's the problem — every failure below starts small and compounds because nobody catches it in week two.

• Mildew, everywhere. A closed cabin in August is a warm, damp, dark box. Vinyl seats, headliners, life jackets and carpet all grow black spotting, and once mildew gets into stitching or under vinyl seams it stops being a cleaning job and becomes a replacement job.
• Bilge pump and battery. This is the one that sinks boats. Summer rain fills a bilge fast, the pump runs, the battery drains, and if a switch or float is already marginal, the next storm finds out. Shore power tripping a breaker in June can mean a dead bank by July.
• Oxidation. Six months of Gulf sun with no wax reapplied and no washing is enough to take a healthy gelcoat to chalky, particularly on dark hulls and horizontal surfaces. Salt spray dries on and stays on.
• Bottom growth. A wet-slipped boat that never moves grows barnacles and slime far faster than one that runs weekly. Come back in November and you may be paying for a haul-out and bottom job before your first trip.
• Chafe and hardware. Dock lines saw through at the chock, fenders wear a groove in the rubrail, canvas snaps corrode, and isinglass hazes permanently if it's left dirty and folded.
• Wildlife. Wasps in the console, birds on the T-top, and — genuinely common here — rodents finding an open hatch and chewing wiring.

Before you fly north: the prep list

Do this in the two weeks before you leave, not the morning of.

• Full wash and wax. Leave the gelcoat protected, not just clean. A boat that starts the summer with fresh protection ends it needing a detail; one that starts bare ends it needing compounding.
• Strip the interior. Take home anything soft or edible — cushions if you can, life jackets, towels, snacks, ice-chest contents. Prop lockers and the fridge open so air moves.
• Dry it, then help it stay dry. Fix any leaking hatch or window seal now. Moisture absorbers or a low-wattage dehumidifier help, but only if someone is emptying them.
• Batteries and bilge. Test the bilge pump and the float switch by hand — not by assuming. Confirm the charger works and the boat is on shore power, or pull the batteries and take them to a trickle charger.
• Fuel system. Top the tank to limit condensation and add a marine stabilizer, then run the engine long enough to get treated fuel through it. Ethanol fuel does not enjoy sitting for six months.
• Cover it properly. A cover that pools water or flogs in a squall does more harm than no cover. Make sure water runs off and nothing chafes.
• Double up the lines. Fresh lines, chafe gear at every contact point, and enough slack for a storm surge tide.
• Paperwork. Confirm your insurance covers named storms and check what your policy or marina contract actually requires of you during a hurricane watch. Many require the boat to be moved or hauled — and that obligation doesn't pause because you're out of state.

Wet slip, dry stack, or trailer

The part no product replaces

Every item above is really the same item: something small goes wrong in June and nobody notices until November. A cover doesn't tell you it blew loose in a squall. A bilge pump doesn't tell you the float stopped working. The only real protection for an unattended boat is a person putting hands and eyes on it on a schedule.

That's what our Boat Watch service is — weekly checks while you're away. Somebody opens it up, checks the bilge and batteries, looks for water intrusion and mildew, checks lines, fenders and cover, runs the blower and the pumps, and sends you a photo report every visit so you can see the boat from your kitchen table up north. If something's wrong, you hear about it in week two, when it's a $200 problem instead of a $6,000 one.

You can also just ask a dock neighbor to look — and if you've got one who'll genuinely do it every week, that's a fine answer. In our experience that arrangement holds up until roughly the second month.

Coming back in the fall

Before your first trip out: charge and load-test the batteries, check the bilge and every through-hull, look at the impeller and raw-water strainer, inspect fuel lines and filters for water, run the engine at the dock before you run it in the Gulf, and get the boat detailed before the mildew you can see becomes staining you can't remove. Nine times out of ten a boat that was checked all summer needs a wash and a shakedown. A boat that sat untouched needs a list.