Winterising a yacht on the Costa Blanca — is it worth it?

Owners coming from the UK often arrive on the Costa Blanca with a winterising checklist that's overkill for the climate — and miss a few things that actually matter here. The Costa Blanca winter is mild but not weatherless, and a yacht that's left to "just sit" from November to April will be noticeably tireder by spring than one that's had a bit of thought.

What you can skip

Some of the classic northern-European winterising jobs aren't really needed here:

• Frost protection on the freshwater system — frost is rare on the coast. A hard freeze inland happens; at sea level it almost never does. Worth checking the long-range forecast for cold snaps rather than blanket-draining.
• Engine antifreeze top-up purely for freezing — your antifreeze is doing corrosion-protection work, not freeze-protection. Check concentration, but you don't need to drain raw-water circuits.
• Wrapping the whole boat in shrinkwrap — overkill for this climate, and it traps heat and condensation in ways that often do more harm than good.

What's actually worth doing

The Costa Blanca winter throws three things at a boat: storms, damp, and neglect. Everything worth doing addresses one of those.

Against storms

• Strip removable canvas (sprayhood, bimini, sail covers if marginal) and store below
• Halyards tied off the mast
• Double-check dock lines and chafe protection — winter has the worst weather
• Anchor cleared from the bow roller if possible, or properly lashed

Against damp

This is the big one in Spain. Closed-up boats with no ventilation grow mould fast, even in cool weather.

• Open all locker doors and cushion compartments
• Lift cushions onto their edges so air can move underneath
• Crack a couple of hatches if rain-protected, or fit dorade-style vents
• Bowl of moisture absorber in the heads, lockers and forepeak — replace every few months
• Empty and prop open fridges and freezers
• Run the heads dry and add fresh water with a little detergent

Against neglect

• Battery isolators off if you're truly leaving it (and shore power on a charger left on)
• Or: leave shore power live and let the charger maintain — your call, but be deliberate about which
• Bilge pump tested before you leave
• Fuel tank close to full (less air = less condensation = less diesel bug)
• Engine run under load before you go, not just a dock idle

The visits-in-winter question

A boat in the water through winter on the Costa Blanca still wants checking. Storms, damp, a charger that quietly trips, a hatch dog that vibrates open — all of these happen in winter as much as summer, and the gap between owner visits is usually longer.

Fortnightly is a reasonable cadence through winter. Less if the boat is on the hard and properly dried-out. More if you're somewhere exposed and a string of low-pressure systems is rolling through.

If you want someone to handle winter checks and the spring de-winterising before you fly back out, get in touch.