A friend left his boat afloat in a Languedoc marina one winter and flew home to Yorkshire, confident he had done everything. In January a tramontane gust over 40 knots chafed a single mooring line through over three nights, the boat surged, and a fender popped. By the time the capitainerie called him, the topsides had a long gouge from the neighbouring pontoon. The boat did not sink. But it was a 1,200 euro repair caused by one line he had not doubled up.
That is the whole argument for and against leaving a boat afloat through a French winter in one story. It is comfortable, convenient and cheaper in handling than hauling out, and it punishes anyone who treats "afloat" as "ignore until spring".
When afloat makes sense
Keeping the boat in the water over winter suits you if any of these are true: you want to use her on mild winter days, you live aboard, your home port has no decent yard, or you simply do not fancy paying for two lift operations. The French marina winter season typically runs October to April, and many ports offer long winter contracts of six or seven months at rates well below the summer nightly tariff.
The cost advantage over hauling out is mostly in handling, not storage. You skip the lift-out and relaunch (roughly 35 to 120 euros each), the cradle, the pressure wash. Your berth fee continues, but you were likely paying that anyway. For the full ashore comparison, the costs are laid out in wintering ashore in France, and the honest answer is that afloat is rarely dramatically cheaper once you account for the antifoul you still owe in spring.
A Mediterranean winter is not as gentle as it looks
People imagine a Mediterranean winter as a calmer summer. It is not. The mistral and the tramontane deliver the strongest, most sustained winds of the year between November and March, and gusts over 40 knots in a marina are routine, not exceptional. Those winds shake the boat for days, working every line, chafing every fairlead, wearing every fender.
So the Med afloat winter is about windage and chafe, not frost. My routine before I leave:
- double every mooring line and lead them through anti-chafe sleeves at the fairleads
- add snubbers to absorb the snatch loads
- strip or tightly lash all sails, remove the bimini and sprayhood, take down anything that catches wind
- over-fender on the windward side, and check the cleats they are tied to are sound
I also pay a local to walk the pontoon after every named blow. Forty euros a month buys someone to re-tension a line before it parts, and it is the best winter insurance going.
Up north it is about water and frost
Move north and west and the enemy changes. The Atlantic, Brittany and Channel coasts bring relentless wind-driven rain from November, and genuine frost risk in the rivers and inland reaches. Two failures dominate here:
The first is the bilge. Heavy rain and snowmelt fill a boat faster than people believe, and a bilge pump on a flat battery is a sunk boat at the pontoon. Check the bilge pumps and float switches monthly, keep the batteries on a maintenance charge, and clear any debris that could jam a float. If you cannot get aboard monthly, pay someone who can.
The second is freshwater systems freezing. Drain the water tank, the calorifier and the pipework, or dose with the right antifreeze, before the first hard frost. A split pipe behind a bulkhead is a miserable spring discovery.
Insurance: read the small print before you fly home
This is where afloat wintering catches owners out worst, and it costs nothing to get right. Many policies impose specific conditions when the boat is left unattended afloat over winter: minimum mooring arrangements, a requirement that someone inspects her at set intervals, sometimes a named-storm lay-up clause. Some marinas also demand proof of insurance to issue a winter contract at all.
Yacht insurance broadly costs 0.5 to 2 percent of the boat's value a year, and the cover is worthless if you have breached a winter lay-up condition you never read. Before you leave the boat, confirm in writing: does your policy cover the boat afloat and unattended from October to April, and what inspection regime does it require? I have seen a perfectly valid-looking claim refused because the owner could not show the monthly checks the policy demanded.
If you are a foreign owner leaving the boat in France over the off-season, there is also paperwork that has nothing to do with insurance, set out in the guide to leaving your boat in France over winter as a foreigner. Sort that before you go, not from an airport.
Damp and condensation, the slow winter enemy
Frost and storms are dramatic, but the damage that actually accumulates over a French winter afloat is damp. A closed-up boat with no airflow grows mould on the headlining, in lockers and behind the cushions, and by spring the interior smells like a cellar. The fix costs almost nothing: crack a couple of vents or fit passive solar vents, lift the berth cushions on edge so air circulates underneath, and leave locker doors ajar.
If you have shore power, a small dehumidifier or a low-wattage tube heater set to hold the boat just above the marina ambient does wonders, but watch the electricity bill, because metered winter power adds up and heating an unattended boat carries its own fire and tripped-breaker risks. I run a dehumidifier on a timer rather than a heater, and I empty it on my monthly visits. The difference in spring is the difference between a fresh cabin and a fortnight of scrubbing.
A winter-afloat checklist before you leave
The list I run through every autumn, in order:
- double all mooring lines, fit chafe protection and snubbers
- remove or lash sails, take down sprayhood, bimini and anything with windage
- over-fender the windward side and check the cleats
- test both bilge pumps and float switches, leave batteries on a maintenance charge
- drain or antifreeze the freshwater system before the first frost
- close the seacocks you do not need open over winter
- ventilate against damp, lift cushions, set a dehumidifier if on shore power
- confirm the insurance lay-up conditions and arrange a monthly inspection
It takes an afternoon. Skipping any one of those eight lines is how a comfortable winter afloat turns into a spring repair bill.
Afloat or ashore? My take
I keep my boat afloat in winter, and I would not lecture anyone who does the opposite. The deciding factor is honesty about presence. If you or a trusted person can be on that pontoon within a day, afloat is comfortable and sensible, and you get to sail on a crisp February afternoon when the marina is empty and the light is extraordinary. If you are flying home for five months and nobody will look at the boat until April, haul out. A boat in a cradle does not chafe, does not fill with rainwater, and does not surge in a tramontane.
The cost of afloat shows up in spring anyway: you still antifoul, still replace anodes, still recommission. Those routine spend lines, and how they fit a whole year of ownership, are tallied in annual running costs of a boat kept in France.
The one habit that matters most
Whatever you decide, winter afloat is won or lost on whether someone checks the boat. Double the lines, drain the water, charge the batteries, read the policy. Then arrange a pair of eyes on her at least monthly. My Yorkshire friend does that now. His lines have not parted since.
