Menu
Destinations→Locations→Blog→Map→About→
📍 mountain · nature

Tà Xùa Mountain

Tà Xùa (Phu Sa Phìn) is Vietnam's 13th highest peak at 2,865m, straddling Son La and Yen Bai provinces. The Bac Yen route - the most popular approach - crosses the legendary dinosaur spine ridge above a sea of clouds, passes the iconic turtle rock, and climbs through an ancient moss forest. Standard trek: 2 days, 2 nights, ~23km total.

🦕 Dinosaur Spine Ridge🌊 Sea of Clouds🐢 Turtle Rock🌿 Moss Forest📸 Photography
🧭 Get Directions

Overview

Best Time to Visit
📅 Nov - Apr (dry season, highest chance of sea of clouds, clearest skies)
Entry Fee
🎟️ Free (guide + porter fees apply)
Opening Hours
🕐 Open 24 hours
Address
📌 Bắc Yên, Sơn La

Things to Know

👥Crowds
Popular with Vietnamese trekkers, especially on weekends from October to April. Weekday departures are quieter. The mountain huts fill up on peak weekends - book through a tour operator in advance.
🥾Difficulty
Challenging. 23km total over 2 days with significant elevation gain. Day 1 is the harder day: 7km, 8 hours of trekking. The dinosaur spine section requires care - narrow, rocky, exposed drops on both sides, strong winds. The final 2.5km to the summit is steep and very muddy. Prior hiking experience recommended; physical training before the trip makes a real difference.
⚠️Safety
Stay with your group - do not separate, especially in the moss forest where the trail is easy to lose. The dinosaur spine has steep drops on both sides; strong winds are common and can be destabilizing. Use trekking poles on muddy sections. Hut accommodation is available - do not attempt to summit and descend in one day without prior experience on the route.
🚶Accessibility
Accessible from Bắc Yên town, Son La. Most trekkers join organized tours (approximately 4,500,000 VND/person for 2 days including guide, porter, hut, and meals). The trailhead involves a motorbike section from town.
🌤️Seasonal
Nov - Apr: dry season, best cloud views, clearest skies - peak trekking season. Feb - Apr: rhododendron blooms add colour to the upper slopes. May - Oct: rainy season brings muddy, slippery trails and reduced visibility; sea of clouds less reliable. The moss forest is most vivid after rain regardless of season.
ABOUT THIS PLACE

What Makes Tà Xùa Mountain Special

Tà Xùa - officially renamed Phu Sa Phìn in March 2025 - stands at 2,865m on the border of Sơn La and Yên Bái provinces, the 13th highest peak in Vietnam and the final section of the Hoàng Liên Sơn range before it drops toward Lũng Lô Pass. The Bắc Yên route is the classic approach: a 2-day, 23km trek that crosses the legendary dinosaur spine ridge above a rolling sea of clouds, passes the iconic turtle rock outcrop, and climbs through an ancient moss forest where centuries-old trees are completely draped in green. It's one of the most visually varied treks in the Vietnamese northwest - forest, ridge, rock, and cloud in a single route.

How to Get There

🚗 Getting There

The trek starts from Bắc Yên district, Sơn La province. From Hanoi, take National Highway 6 toward Hòa Bình then continue to Sơn La - Bắc Yên is a turnoff roughly 280km from Hanoi, around 6-7 hours by motorbike or private car. Buses run from Hanoi's Mỹ Đình station toward Sơn La with stops at Bắc Yên. Most trekkers join an organized tour departing from Hanoi or Bắc Yên town - this is the most practical option as guides, porters, and hut arrangements are handled for you.

What to Expect

👀 On the Ground

The standard format is 2 days, 2 nights, ~23km total. Day 1 starts on concrete road before transitioning to earth trail - manageable in dry conditions, extremely muddy and slippery when wet. The trail climbs through forest to Hut 1 (lán 1), then continues to the dinosaur spine: a narrow rocky ridge with sheer drops on both sides and open views over a sea of clouds when conditions cooperate. Past the spine, another kilometre brings you to Hut 2 where most groups overnight. From Hut 2, a further 2.5km of increasingly muddy trail climbs into the moss forest and up to the 2,865m summit. Day 1 covers around 7km with approximately 8 hours of trekking. Day 2 takes a different descent route - you pass the dinosaur spine again and the turtle rock (tảng đá đầu rùa), one of the most photographed features on the mountain, before reaching the trailhead around 3 PM. Day 2 is roughly 6km and 6 hours.

Travel Tips

🧳 Tips

Organized tours from Bắc Yên cost approximately 4,500,000 VND per person for the 2-day package including guide, porter, hut accommodation, and meals. Independent trekking without a guide is not recommended - the trail through the moss forest is easy to lose and the terrain near the dinosaur spine is serious. Pack light: a 5kg backpack is the target. The porter handles camping and food gear; your pack should contain only personal items - warm layers, rain jacket, headlamp, snacks, water, and first aid. Footwear is critical: waterproof hiking boots sized one up from normal to accommodate swelling on long descents. Trekking poles help significantly on the steep, slippery sections, particularly the descent on day 2.

Insider Tips

Based on real traveler experiences and commonly mentioned advice from multiple visitors.

Train your legs before the trip - the descent on day 2 is where unprepared knees give out
Size up hiking shoes by one size and cut toenails before departure - foot problems are the most common complaint on this route
Book through a tour operator for guide, porter, hut, and meals included - going independent without a guide is not recommended
Bring warm layers for the hut overnight - temperatures at elevation drop significantly even in the dry season
Feb to Apr for rhododendron blooms; Nov to Jan for the clearest sea of clouds
Train before you go - the trek involves 8 hours of moving on day 1 with significant elevation gain. Leg endurance matters more than cardio here.
Size up your hiking shoes by one size - feet swell on long descents and tight shoes cause serious toenail problems. Cut your toenails before the trip.
The dinosaur spine section is narrow, rocky, and exposed on both sides - strong winds are common. Anyone with a fear of heights will find it genuinely uncomfortable. Take it slow.
The moss forest section feels like stepping into a fantasy film - ancient trees completely draped in moss, dim green light, total quiet. It hits differently than you expect.
Hire a guide and porter through a reputable tour operator from Bắc Yên. A light pack around 5kg makes a real difference over 2 days. Let the porter carry the heavy stuff.
Bring: trekking poles (essential for the muddy descent), headlamp, insect repellent, warm jacket (nights in the mountain hut are cold), chocolate or energy snacks.
The mountain huts (lán) are built from wood, windproof, and have thick blankets. Still bring thermal layers, a beanie, and thick socks - it gets cold at elevation.
Stay with your group. Do not separate, especially in the moss forest or near the dinosaur spine. And pack out all your rubbish.
Day 2 takes a different route down - you get the dinosaur spine AND the turtle rock in the same trip. The variety makes it worth the 2-day commitment.
Feb to Apr: rhododendron (hoa đỗ quyên) blooms on the upper slopes - one of the best times for colour photography.

FAQ

Common questions from travelers who've visited this place.

Can I do Tà Xùa in one day?›
Not recommended. The standard route is 2 days, 2 nights covering 23km total. Attempting the full route in one day would require around 14 hours of continuous trekking. Most tour operators only offer the 2-day format.
What is the dinosaur spine?›
A narrow rocky ridge section with steep drops on both sides and strong winds. It's one of the most photographed sections of the trek - dramatic views over the sea of clouds when conditions are right. Anyone with a fear of heights will find it genuinely challenging. Take it slowly and follow your guide's line.
What is the best time to visit for sea of clouds?›
November to April gives the highest probability of sea of clouds, with clearest skies in November to January. Morning hours - around sunrise - are when cloud formations are most dramatic. Weather is unpredictable and not guaranteed on any given day.
How cold is it in the mountain huts overnight?›
The huts are built from wood, windproof, and have thick blankets. But temperatures at 2,000m+ drop significantly at night even in the dry season. Bring thermal base layers, a beanie, and thick socks at minimum. Hand warmers are a useful addition in December and January.
Do I need a guide?›
Yes. The trail through the moss forest near the summit is easy to lose, and the terrain near the dinosaur spine is serious. All reputable operators include a guide and porter in their tour package. Solo independent trekking without local guidance is not recommended.

Similar Experiences

Explore more things to do like this around Vietnam

🥾Trekking→📸Photography→🏕️Camping→