The great passes: Vietnam's best mountain roads

Short version: Vietnam's best roads are mostly its passes. Riding south to north you can string together a dozen or so: the two roads down from Da Lat, the Central Highlands crossings, Hai Van on the coast and the four giants of the far north. None needs a big bike. All of them need good brakes, a low gear on the way down and a look at the morning's news, because the mountains that make the views also make the landslides.

The passes at a glance

Lengths depend on where you start counting, and published heights often disagree. These are the commonly quoted figures, checked against open elevation data. Where sources conflict, we say so.

From Da Lat down to the sea

Ngoan Muc (also called Song Pha) is the old French road from the coast up to Da Lat, and the steepest pass in the south. It climbs from about 200 m to 980 m, with four very tight hairpins. It is the usual detour when Khanh Le is shut, though landslides closed it too, more than once, in late 2025.

Khanh Le is also called Hon Giao, or "Omega" after its shape on the map. It is one long descent from pine forest to the Cai River valley. The sign at its foot says 29 km; most write-ups say 33. Landslides in November 2025 closed it for weeks, and on 11 November 2026 it was still shut every night from 6pm to 5am. Dry-season mornings are the time. October to December is not.

Into the Central Highlands

An Khe is short, steep and shared with every truck between the port and Pleiku. Broken surface was reported through 2026. Vietnamese sources put the top at 740 m and elevation data nearer 500 m, so we won't quote either. Climb it early, in the cool.

Violak is the quiet crossing further north, from the Quang Ngai coast up to Mang Den and Kon Tum, and is not on our routes. It is often in cloud. In late July 2026 one sunken stretch was down to a single lane under 4 m wide, with repairs promised by the end of the year.

Lo Xo carries the Ho Chi Minh Road through deep forest beside the Ngoc Linh massif. Its length comes from Vietnamese press reports and its height from elevation data; we found no official figure for either. Expect little traffic, patched concrete, gravel on the bends and no dependable fuel for 60 km. Slips cut it for four days in October 2025, and September to December is the season to avoid.

On the coast: Hai Van and Ngang

Hai Van is the one everybody has heard of: sweeping bends between jungle and sea, with a Nguyen-dynasty brick gate at the top. The tunnel underneath opened in 2005 and is closed to motorbikes and fuel tankers, so the two share the pass. Riders have reported slick patches of spilt fuel. The best months are March to September. In winter the north side is often in cloud and drizzle while Da Nang is dry.

Ngang is small and famous, thanks to a much-loved 19th-century poem. Highway 1 has used a tunnel here since 2004, and a second tube was due to open in January 2026. The old road still climbs to a stone gate on the ridge. Our route runs inland here, so this is one for riders following the coast. We couldn't confirm whether bikes may use the tunnel.

The north's "four great passes"

Vietnamese road-trippers call the next four the tu dai dinh deo, the "four great pass summits". It is a backpackers' label, not an official list: a 2016 Tuoi Tre feature credits them with the saying that nobody knows the northern mountains until they have crossed all four.

• Khau Pha links Tu Le and Mu Cang Chai above some of the country's finest rice terraces. Go from mid-September to early October, when the rice turns gold. It is often in fog, and stretches have no guard rail.
• O Quy Ho crosses the Hoang Lien range and was recognised in 2013 as Vietnam's longest pass. Published heights run from 1,991 to 2,073 m. In winter the Sa Pa side can sit in thick fog all day, with ice in a cold snap. A road tunnel, begun in December 2025 and due in 2027, should take through traffic off the upper pass.
• Pha Din was the supply road to Dien Bien Phu in 1954. Today's QL6 crosses a few hundred metres below the old 1,648 m summit, and the old road is left to the curious.
• Ma Pi Leng is cut into the cliffs above the Nho Que River, on a road that volunteers built, largely by hand, between 1959 and 1965. It is the reason people ride the Ha Giang Loop.

The Cao Bang Loop adds a gentler cousin, Ma Phuc Pass.

In the north, September to November is the season. December to February is cold and foggy, and June to August brings heavy rain and landslides. See When to go.

Riding a pass safely

• Cloud. Slow down until you could stop within the distance you can see, put your lights on and keep right. Better still, wait it out over coffee.
• Cold. The top can be ten degrees cooler than the bottom. Put a layer on before you climb; cold hands brake slowly.
• Gravel on corners. Landslides and trucks leave grit exactly where you want to lean. Brake before the bend, not in it.
• Brake fade. Brakes held on all the way down a long descent overheat and stop working. Change down and let the engine hold your speed, brake in short firm presses, and stop to let things cool if the lever goes soft. Bikes with gears do this better than twist-and-go scooters.
• Trucks. Overtake only where you can see the whole manoeuvre. Expect something on your side of every blind bend, and sound your horn before it.
• Fuel and daylight. Fill up before the climb and be over the top by mid-afternoon.

More in Riding safely.