Winter is a Different Mountain

The Cairngorms do not change gently with the seasons. In July you might stroll across the plateau in a T-shirt; by January the same ground can be a wind-scoured ice rink under a whiteout, with the wind gusting hard enough to knock you off your feet. The plateau around Cairn Gorm, Ben Macdui and Braeriach is genuinely sub-Arctic in feel, and the coires — Coire an t-Sneachda, Coire an Lochain, the great bowl of the Lairig Ghru — hold snow well into spring.

What catches people out is not the cold. It is the combination of wind, poor visibility and the fact that the ground underfoot is often a mix of boilerplate ice, deep windslab and bare rock. A walk that would be a straightforward summer hill day becomes a serious undertaking. Midwinter gives you as little as six and a half hours of usable daylight, and the weather can turn in twenty minutes. Plan for the mountain you might meet, not the one in the forecast.

The Kit That Earns Its Place

Some items in a winter pack are negotiable. These are not. If you are heading onto the high ground between November and April, carry them every time, even on a short day.

• An ice axe — a general-purpose walking axe, around 55–65cm depending on your height, with a sharp pick and a good adze.
• Crampons — twelve-point steel crampons, fitted and adjusted to your boots before you leave the house. Check the straps or bailes each time you put them on.
• Goggles — ski-style goggles with a category 2 or 3 lens. Sunglasses alone will not help in spindrift, and snow blindness is real.
• An emergency shelter — a bothy bag or group shelter large enough for everyone in your party. This is the single most useful piece of kit you can carry if someone is injured or exhausted.
• Extras that matter — a headtorch with spare batteries, a spare pair of gloves, an insulated sit mat, a flask, and a map and compass you can actually use.

Dress in layers you can manage with gloves on. Wet cotton has no place on a winter hill.

Practise the Skills Before You Need Them

Owning an axe is not the same as being able to use it. Ice axe arrest — the technique for stopping a slide — needs to be automatic, and it only becomes automatic through repetition.

Find a safe, soft snow slope with a clear run-out, well away from rocks and crevasses. Practise sliding head-first and feet-first, rolling onto your front, driving the pick into the snow and holding the shaft across your chest in the self-belay position, with your legs kicked up out of the way. Do it until you get it right every time, then do it again next season. Hands numbed by cold do not learn new tricks.

Practise walking in crampons too. Flat-footing on moderate icy ground, keeping all points engaged, is far more secure than front-pointing your way up a slope you should not be on. On a traverse, kick steps and keep your ankles relaxed.

Read the Forecast and the Snowpack

Two forecasts matter: the mountain weather forecast and the daily avalanche report for the Scottish mountains. Read both the night before and again in the morning, and be honest about whether the day still matches your plan.

Wind is the great Highland disrupter. Gusts of well over 100mph have been recorded on the Cairngorm plateau, and anything above 40mph makes walking and communicating difficult. Look at the freezing level, the wind direction and the cloud base, then picture your route at its most exposed point.

Avalanche forecasts use a five-level scale, and in Scotland the classic killer is windslab on lee slopes, most often north through east. Slab builds quickly after a snowfall and can be triggered by a single person on a loaded slope. Avoid steep, smooth, chalky-looking snow, listen for the hollow drumbeat sound underfoot, and stay off corrie headwalls after heavy snow and strong wind.

Tell Someone — Properly

"I'll text you when I'm back" is not a plan. Leave a written route card with someone reliable: your intended route, the names of everyone in the party, the car park and registration, your estimated finish time and the route you would take if you had to change plans. Agree a time by which they should raise the alarm if they have not heard from you, and stick to it.

Keep your phone charged and in a warm inside pocket, because cold drains batteries fast. Mobile signal is patchy or absent in Glen Dee, the Lairig Ghru and much of the plateau. In an emergency, dial 999 and ask for the police, then mountain rescue; if signal is poor, a text to 999 can sometimes get through when a call will not.

Knowing When to Turn Around

The hardest decision in winter is the one made early, while everyone is still fresh and hopeful. Set a turnaround time before you set off, and treat it as fixed. If the wind is stronger than forecast, if the cloud is down and your navigation is shaky, if someone is cold or slow, or if the snowpack feels wrong, that is your answer.

The Cairngorms will still be there next weekend. Come home with cold fingers and a story, and you have had a good day out.