Almost every Bhutan trip turns round at Bumthang. The road keeps going east, over a 3,780-metre pass and down through cloud forest to orange groves at 650 metres, and it is the best riding in the country.
Where most Bhutan trips stop
The standard Bhutan itinerary is a loop in the west. Fly into Paro, see the Tiger’s Nest, cross the Dochula to Punakha, maybe get as far as Trongsa or Bumthang, then turn round and come back the way you came. It is a fine week. It is also about a quarter of the country, and it is the quarter with the hotels.
Keep going east from Bumthang and something changes. The road narrows, the traffic thins to almost nothing, the tour buses vanish entirely and the terrain gets serious. What stands between you and the eastern half of Bhutan is a pass called Thrumshing La, and it is the reason most operators do not bother.
It is also, by a distance, the best day on a motorcycle in the entire kingdom.
The numbers
Thrumshing La sits at three thousand seven hundred and eighty metres, which makes it the second highest road pass in Bhutan. It stands on the boundary between Ura in Bumthang district and Saling in Mongar district, across the Donga range, and it is the point where central Bhutan hands you over to eastern Bhutan.
The road over it was built in the 1990s, which by the standards of Himalayan engineering is recent, and it has been maintained with the enthusiasm you would expect for a route serving a very small number of people in a country with a very small budget. It is paved, mostly, in the sense that there is asphalt under you for a good deal of the time and gravel for the rest. It is steep. It has thousands of corners, a great many of them hairpins, and long stretches where the width is genuinely marginal for two vehicles.
Then, eastbound, it does the thing that makes it extraordinary. From just under three thousand eight hundred metres at the top, the road drops all the way down toward six hundred and fifty metres, through the whole vertical range of the eastern Himalaya, in a single continuous descent.
What that descent actually gives you
Vertical bands of vegetation are a textbook diagram until you ride through them in one afternoon.
You start at the pass in alpine country: stunted fir, rhododendron scrub, prayer flags in a wind that goes straight through anything you are wearing, and old snow in the shadows well into spring. Within half an hour of descending you are in proper conifer forest, the trees getting taller as the air thickens. Then the firs give way to broadleaf, and then the broadleaf gets hung with moss and lichen and epiphytes, and you are in temperate cloud forest with water dripping off everything and the visibility down to fifty metres.
Keep going. The moss thins, the leaves get bigger, ferns appear, and somewhere around fifteen hundred metres the air stops being cold and starts being merely cool. By the time you are down near Mongar the hillsides have maize on them. And by the following day, dropping further south toward Panbang, you are in orange groves in genuine subtropical heat, having started forty-eight hours earlier in a place where you needed a thermal liner.
Very few roads on earth do that in one go. It is the single strongest argument for putting eastern Bhutan on an itinerary.
The national park it runs through
The pass gives its name to Thrumshingla National Park, and this is not a paper designation. The park protects one of the better remaining stretches of eastern Himalayan forest and it is a serious birding destination, with rufous-necked hornbill, satyr tragopan, blood pheasant and a long list of species that mean nothing to most riders and a great deal to the people you will see standing beside the road with tripods.
There are red panda in there. You will not see one, and neither will they, but they are there.
What you will notice, and what surprises people, is the sheer density of the forest. Bhutan is constitutionally required to keep at least sixty percent of its land under forest cover and it currently runs well above that. It is the only carbon-negative country on earth. Ridden through rather than read about, that policy is a wall of green going up both sides of the road for six hours.
Riding it, honestly
This is not a difficult road in the technical sense. It is a demanding one in the concentration sense, and there is a difference.
The surface changes constantly. You get good asphalt, then a hundred metres of loose gravel where a slip came down and was cleared, then broken edges, then a wet patch under an overhang that never sees sun. Nothing is signposted. The width means an oncoming truck requires a plan rather than a shrug, and there are trucks, because this is the only road to the east and everything the eastern districts consume comes up it.
Blind corners are the real work. On a road with thousands of them and no centre line, the discipline is to ride as though something is coming round every single one, because eventually one of them has a Tata truck in it taking the whole width. Sound the horn on the blind ones. Everybody local does, and the trucks answer.
Roadworks are a constant. Bhutan has been widening its main lateral road for years and the work moves along it, which means you will meet excavators, single-lane control and stretches where the surface has been stripped back to rock. Delays of an hour are normal and are simply part of the day.
The weather decides more than you do
Thrumshing La closes. Heavy snow shuts it, and when it does the eastern half of the country is cut off by road until it clears, which is a real thing that happens rather than a theoretical risk.
Outside winter the problem is not snow but water. The eastern Himalaya catches an enormous monsoon, and cloud forest on steep ground with a road cut into it produces landslides. During and just after the monsoon, sections of this road come down with some regularity, and clearing them takes as long as it takes.
Which is why the sensible riding seasons in Bhutan are spring, roughly March to May, and autumn, roughly late September to November. Autumn is the better of the two for this particular road: the monsoon has finished and washed the air clean, the slides have mostly been cleared, and the visibility from the pass is at its best. Spring gives you rhododendrons in flower on the upper slopes, which is a spectacular thing to ride through, at the cost of more cloud.
Ura, on the way up
The village of Ura sits in a high valley on the western approach, at around three thousand one hundred metres, and it is one of the most complete traditional settlements left in Bhutan: clustered whitewashed houses with shingled roofs, cobbled lanes, a temple, and a landscape of potato fields and sheep pasture around it.
It is worth the stop, and not only because it is the last realistic tea before the pass. Ura is high enough and remote enough that the way of life there has changed less than almost anywhere else in the country, and the valley in autumn with the buckwheat turning is one of those views that people photograph badly and remember perfectly.
Mongar, and what eastern Bhutan is like
The east is poorer, hotter, less visited and considerably more relaxed than the west. Mongar is a hillside town built on a ridge because there is no flat ground to build on, with a dzong that is unusual in being modern, constructed in the 1930s and one of the few built without a written plan or a single nail, using the traditional method.
What strikes riders coming from the western circuit is how few foreigners there are. In Paro and Thimphu you are one visitor among many. In Mongar you are an event. Children come to look at the bikes. People want to know where you have come from and why anybody would ride here on purpose.
The other thing is the chillies. Bhutanese food is built on chilli treated as a vegetable rather than a seasoning, and the national dish, ema datshi, is chillies stewed in cheese. In the east they take this further than in the west. Ask for it mild and it will still not be mild. This is a country where you should say yes to the rice and be strategic about everything else.
The road to Panbang, which is the sequel
The day after the pass, the route drops south from Mongar toward Panbang and the Indian border country, and this is where the descent finishes properly. Down to around three hundred and fifty metres, into humidity, into subtropical forest, into a completely different Bhutan.
It is a long day, seven hours for a hundred and sixty-seven kilometres, which tells you everything about the average speed. The road follows river valleys, the temperature climbs steadily, and by the end of it you are peeling off layers you had been grateful for the previous morning.
This is Royal Manas country, the oldest protected area in Bhutan and a place almost no tourist reaches. Wild elephant, tiger, gaur. You will not see them from the road, but you will understand very quickly that you are in a different ecosystem from the one you were in yesterday.
Left-hand traffic, thin air and a small country
Bhutan drives on the left, which catches out riders coming from continental Europe and from the Americas, and the place to have already sorted that out is not a blind hairpin on a cliff.
Altitude is a mild concern rather than a serious one here. Three thousand eight hundred metres is high enough to notice: you will be breathing harder pushing the bike around a car park, and a night at Bumthang before the crossing is useful. It is not Ladakh, where the risk is real and structural. Bhutan’s classic itineraries spend their nights between twelve hundred and three thousand metres and only touch the high ground in transit.
The last thing to understand about riding in Bhutan is the scale. The whole country is smaller than Switzerland and the roads are slow enough that a hundred and eighty kilometres is a full day. Distance means nothing here. Time and altitude mean everything.
The Lateral Road, which is the spine of the country
Everything you ride in Bhutan hangs off one road, and it is worth understanding what it is.
The Lateral Road, sometimes called the East-West Highway, runs the length of the country from Phuentsholing on the Indian border in the west through to Trashigang in the east. It was built in the 1960s by India’s Border Roads Organisation, the same outfit responsible for most of the Himalayan road network, at a point when Bhutan had essentially no motorable roads at all. Before it, moving anything across the country meant mules and weeks.
What that history means on the bike is that you are riding a road designed in the sixties for very little traffic, cut into some of the steepest ground on earth, and only progressively widened since. It crosses every north-south ridge in the country, which is why it climbs a pass, drops into a valley, and climbs the next one, over and over, all the way from one end to the other. Thrumshing La is simply the biggest of those crossings.
There is no alternative route. If the Lateral Road is blocked, the country is cut in half, which is exactly what happens when Thrumshing La takes snow. There is a certain clarity to riding a country with only one road in it.
What you actually ride, and how it handles the road
Bhutan is not big-bore adventure bike country, and anybody arriving expecting to be handed a fully loaded twelve-hundred is going to be relieved rather than disappointed.
The riding is constant second and third gear work on narrow tarmac with broken edges, gravel patches, hairpins and blind corners. What earns its keep is a light machine with good steering lock, decent ground clearance for the rough sections, and a seat you can get both feet down from when a truck forces you onto a soft verge. Royal Enfield Himalayans and similar mid-capacity singles are the standard weapon across the Himalaya for exactly these reasons, and they are the right tool here.
Range is not a problem in Bhutan the way it is in Mongolia. Fuel exists in every district town along the Lateral Road and the distances between them are short. What you should carry instead is a spare clutch cable, because a road with thousands of hairpins on it eats clutches, and the ability to check your own chain tension, because a chain that gets loose on Thrumshing La will let you know about it in the least convenient place.
Brake pads deserve a thought too. A continuous descent from three thousand eight hundred metres to six hundred and fifty is a long time on the brakes, and riders who ride the whole thing on the front lever rather than using engine braking will arrive at the bottom with pads noticeably thinner than they left with.
Why so few operators go east
Commercially it is obvious. The west has the airport, the famous sights and the hotels. Going east adds days, costs money, involves accommodation that is basic by comparison and takes you a long way from a plane if anything goes wrong. A twelve-day guided tour that stays west is easier to sell and easier to run.
The counter-argument is that everybody who does the western loop comes back describing the same four places, because they went to the same four places. The east is where you get the Bhutan that is not on the postcards: the empty road, the cloud forest, the town where nobody is selling you anything, and a pass that most visitors to the country never see.
What it costs, and what is included
Bhutan is not a country you can do cheaply, by design. There is a nightly levy on every visitor that sits on top of the trip price and funds the country’s health and education systems, and it applies to every night you are in the country regardless of what you do with the day.
Because of that structure, a Bhutan motorcycle tour is priced differently from anywhere else we ride. The levy, the visa processing, the licensed local operator and the guide are all mandatory rather than optional, and any quote that looks dramatically cheaper than the others is either missing something or misunderstanding the rules. It is worth reading the fine print on what is and is not included before comparing two prices.
The dogs, the archery and the other things nobody warns you about
Three small realities of Bhutan that nobody mentions in a brochure and that shape the experience more than you would expect.
The first is the dogs. Bhutan has a large free-roaming dog population, protected by a Buddhist reluctance to cull anything, and they sleep all day and hold conferences all night. In a small hill town the noise at two in the morning has to be experienced. Earplugs are part of the packing list. On the road they are a hazard in the ordinary way: they sleep in warm patches on the tarmac and they wake up at exactly the wrong moment.
The second is archery, which is the national sport and which is taken with a seriousness that is hard to convey. The targets are absurdly far away, the teams dance and sing to put each other off, and every district town has a ground. If you pass a match, stop. You will be invited to try, you will miss, and it will be one of the better hours of the trip.
The third is that Bhutan is a dry country in patches. Tuesdays are traditionally a national dry day, tobacco has a complicated legal history, and the general expectation is one of restraint. Nobody is going to lecture you over a beer after a riding day, but the after-hours culture that surrounds a Thai motorbike tour does not exist here, and riders looking for one will find the evenings quiet. Most decide that is a feature.
Riding eastern Bhutan for real
Our twelve-day Bhutan ride is built specifically to get past Bumthang. Days one to five run the classic western ground, Paro and the Chelela, Thimphu, the Dochula into Punakha and up into the Bumthang valleys. Then day six goes over Thrumshing La to Mongar, day seven drops all the way to Panbang and the subtropics, and day eight climbs back to Trongsa. The loop closes through the Phobjikha valley and finishes with the Tiger’s Nest hike at Paro.
Small group, road captain, mechanic and support vehicle, licensed Bhutanese partner, visa handled, the daily levy included in the price and no surprises on the bill. Have a look at the 12-day Bhutan motorcycle tour or the wider Himalayan motorbike tours page. Departures are limited by the seasons and by Bhutan’s own permit process, so if a big biking tour to the far side of Thrumshing La is on your list, message us on WhatsApp well ahead of your dates.
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