Ta Lien Son Mountain

Ta Lien Son - also known as Cổ Trâu mountain - rises to about 2,996 m on the southwestern side of the Hoàng Liên Sơn range, in Tả Lèng commune on the Lai Châu side of the Lào Cai-Lai Châu boundary. It is usually listed sixth among Vietnam's highest peaks, after Fansipan, Pu Si Lung, Pu Ta Leng, Ky Quan San and Khang Su Van, and it draws younger trekkers with its steep slopes and sharp summit.

It is not one of the hardest high peaks to climb, but it still demands endurance, and many trekkers describe it as a good choice for people new to high-mountain trekking. In December 2023, Lai Châu province held a mountain race on Ta Lien Son.

A Fairy-Tale Forest

Ta Lien Son is a mountain for forest lovers. The trail runs through primeval woodland where huge old trees are wrapped in moss and ferns, vines climb over rocks, and colourful fungi grow on the trunks. Depending on the season, the path is carpeted with white camellia flowers and red maple leaves, and rhododendrons flower in white, yellow, red, purple and pink. On clear days you can look out over Lai Châu from the upper slopes, though the views are usually hazy.

From Hanoi there are three main options. You can take a sleeper bus to Lai Châu (about 7 hours) and then a xe ôm to Tả Lèng village; take a sleeper bus to Sa Pa and rent a motorbike to ride to the Tả Lèng trailhead; or book a trekking tour that handles all the transport.

Most trekkers ride a xe ôm right up to the edge of the forest at Tả Lèng, from where it is about 9 km to the summit; the whole route is commonly quoted as about 11 km. The motorbike ride from the foot of the mountain to the trailhead is steep and hair-raising in places. The alternative approach from Sin Suối Hồ is generally described as easier, and many groups go up one side and down the other.

The trail from the trailhead to the camp is mostly gentle and shaded, with steady, not-too-sharp climbs through beautiful forest. From the camp to the summit it gets much steeper: you scramble over tree roots, haul yourself up on branches and use around 10 fixed ropes near the top. A few sections are exposed but manageable with care. In wet weather the summit area turns to deep, slippery mud.

Opinions on difficulty vary: some trekkers find it fairly easy and suitable for beginners, while others call it challenging. Coming up from Tả Lèng means more rope and root climbing than the Sin Suối Hồ side. Strong trekkers can do it in a day (about 10 hours up and down), but most recommend 2 days 1 night to enjoy the scenery and relax.

Camp, Water and the Summit

Groups overnight at a camp or hut on the mountain; midweek it is often quiet, and in winter blankets and mattresses are reportedly provided. Nights are cold. There is only one stream on the route, about 30 minutes from the campsite, so bring plenty of water, and only Viettel has signal. The summit itself is narrow and often shrouded in fog - most trekkers agree the views along the trail are far better than the view from the top, and Ta Lien Son is not a good choice for cloud hunting.

If you're going independently, study the terrain and plan your climb in detail; if not, book a tour or hire a local porter, who will guide you and show you the best spots. Tours cost around 3,000,000-5,000,000 VND per person (2026) with operators such as Wild Adventure, Tổ Ong Adventure and Viettrekking. Services on the mountain are still basic, so bring enough food and water.

Ta Lien Son Through the Seasons

• Sep - Nov: golden rice in the valleys and maples turning colour; late Nov is often the peak for red leaves
• Nov - Jan: cold weather and thick mist; in Dec the trail is covered in maple leaves and white camellias
• Jan - Feb: camellia flowers turn the forest white
• Mar - Apr: rhododendrons in many colours - though some years the bloom fails