Leh sits at about 3,500 m, and visitors are asked to rest at least 48 hours in and around Leh before going higher. This itinerary builds that in, and then keeps the rise in sleeping altitude modest.
The Leh days. You arrive on day 1 and rest. Day 2 is a short walk, about 3 hours and 4 km, to Tsemo Monastery and Shanti Stupa at around 3,650 m, with the rest of the day easy. Nothing on the trail begins until you have spent two nights in Leh.
Easing in. The first night after Leh is at Lamayuru (3,510 m), about the same height as Leh. Day 4 moves to Kanji (3,850 m), and day 5 to Kanji La Base Camp (4,350 m). The first walking day is deliberately short and easy, 5 to 7 hours over 13 km, so that the group arrives at the foot of the first big pass with a few days of altitude behind it.
Sleeping heights on the way to Lingshed. After Kanji La you sleep at Kanji Sumdo (4,300 m), then Dibling (4,100 m), then drop to Lingshed (3,900 m). The trail goes higher than you sleep, which suits the body, and the days spent at or below 4,300 m are the ones that follow the pass days. After Lingshed the route drops steadily towards 3,400 m around Hanamur, Pishu and Zangla.
Rest days that matter. Day 9 in Lingshed is a full day without a pass, and it sits straight after the longest walking day of the trek. We do not add days only for training; the rest is placed where it helps.
What to expect. This is a Strenuous trek. Days of 5 to 8 hours are normal, and a few run to 8 or 9 hours. Sleeping altitude goes above 4,000 m on a couple of nights and no higher. The trail is remote and evacuation is not possible from every camp, which is one reason we keep the group small and the pace honest. Tell your leader early about a headache or poor sleep, and drink steadily. We turn around when it is right to turn around.
Temperatures run from about -5 to 20 degrees Celsius over the season, so bring layers that cover a cold camp at 4,000 m and a warm afternoon in the valley. Gloves and a shell are worth keeping at the top of your daypack on pass days.
Fitness matters more than anything else you can prepare. Regular cardio and long walks with a loaded pack for a few months before you arrive will make every one of these days more comfortable.