A Beginner's Guide to Wild Swimming in Scottish Lochs

Before you get in: choosing your first loch

Not all Scottish lochs are created equal for a beginner. Deep, dark Highland lochs fed by snowmelt can sit at 6°C in July, while shallow lowland lochs with sandy or gravelly shores can reach 17–18°C by late August. For your first few swims, look for a loch with a gentle shelving beach, a sheltered aspect away from the prevailing south-westerly wind, and easy parking within a couple of minutes of the water.

Lochs with sandy bays or a shallow shelf are ideal. You want to be able to walk in slowly rather than step off a ledge into deep water. Avoid anywhere with a steep drop-off, obvious outflow currents, or a boat slipway where traffic might appear. Small, shallow lochs warm up quickest; big, deep ones stay cold year-round.

• Lowland lochs in Perthshire, the Trossachs and Dumfries and Galloway warm up fastest.
• Sheltered bays on larger lochs are calmer and safer than open water.
• Forest lochs are lovely but often have muddy, reedy edges — take care with footing.
• Avoid after heavy rain, when run-off, silt and occasional agricultural overflow make water quality poorer.

What to take to the shore

The kit is simple, but the few items you leave behind are always the ones you wish you had. A bright swim hat and a tow float make you visible to boats and other water users — a tow float is not just a safety aid, it is a dry bag you can clip to your waist and tow behind you. Wear a well-fitting wetsuit if you feel the cold, or a neoprene cap and gloves if you are swimming skins.

On the shore, leave out everything you need before you get in, so you are not rummaging with cold hands afterwards:

• A warm layer or changing robe, plus a woolly hat and thick socks.
• A large towel and a mat or bin bag to stand on while you change.
• Old trainers or neoprene booties for stony or weedy entry points.
• A flask of hot, sweet tea and a snack.
• A car key and phone in a waterproof pouch, kept on you or left with a friend.

Never swim alone, especially in a new loch. Tell someone where you are going and when you expect to be back. Check for blue-green algae warnings locally — blooms look like pea soup or spilled paint and can be toxic to swimmers and dogs. If in doubt, swim elsewhere.

The art of a slow entry

Cold water entry is where most beginners come unstuck, because the instinct is to get it over with. Don't. The gasp reflex, a sudden spike in heart rate and a feeling of panic are all normal responses to cold water, and they pass within a minute or two if you give them time. The trick is to let your body acclimatise rather than shock it.

• Wade in to your knees and stop. Breathe out slowly, like you are blowing out a candle.
• Splash water on your face, wrists and the back of your neck — these areas trigger the strongest cold response.
• Walk in step by step, never dive or jump in. Keep your feet on the bottom until your breathing settles.
• Lower your shoulders under gradually, then pause before you start swimming.

Expect the first 30–60 seconds to feel unpleasant. For most people it eases. If your breathing does not settle, or you start to feel panicky, walk out — there is no shame in it, and the next attempt will be easier.

Reading the water

Lochs are usually calmer than the sea, but they have their own hazards. Wind can arrive quickly and turn flat water choppy in minutes, particularly on bigger lochs where it funnels down the glen. Swim close to shore and parallel to it, so you always have a short route out. Watch for anglers — a drift line or a boat appearing quietly around a headland — and stay well clear of slipways and jetties.

Cold layers are another consideration. In deep lochs, a few metres below the surface the water can be several degrees colder than the top layer. Stay in the shallows for your early swims rather than heading for the middle. Reeds and weed beds near the shore can tangle feet, so choose clear gravel where you can. And keep an eye on the exit point — a loch that looks familiar from the water can look surprisingly different when you turn around.

Getting out and warming up properly

The danger zone is often the twenty minutes after you get out, not during the swim. Your skin temperature keeps falling as cold blood returns from your limbs to your core — this is the afterdrop, and it is why you can shiver harder on the shore than you did in the water. Get dry and dressed fast, in this order: towel off, hat on, base layers, then fleece, then a windproof outer. Stand on something dry.

Sip hot tea and keep moving gently. Avoid a hot bath or shower straight away, which can pull blood to the skin too quickly and make you feel faint. Dress warmly, walk about, and let your body warm up gradually. If shivering continues hard for more than half an hour, or you feel confused, slur your words or go grey, get help and keep the person warm — do not let them drive.

Building it through the seasons

Start in late summer, when lochs are at their warmest, and swim little and often rather than long and rarely. Five to ten minutes is plenty at first. If you want to swim through winter, build up gradually from October, shortening your swims as the temperature drops and never staying in long enough to lose the ability to dress yourself.

Local informal swim groups are a good way to learn a new loch safely, and the Scottish Outdoor Access Code gives you the right to swim in most inland water responsibly. Go with a friend, go slowly, and treat every loch with respect — the cold is the point, but it is also the thing to take seriously.