Thailand's highest point is a car park in cloud. The ridge an hour below it is the reason to drive two hours.
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Doi Inthanon is a mountain with a national park on it, a hundred kilometres south-west of Chiang Mai, and the highest ground in Thailand at 2,565 metres. It is also the day out most often sold on the wrong thing: the summit is the headline, and the summit is the least of it.
This page is the version we would give a friend with one spare day. What is actually worth the drive, when the ridge is open and when it is not, what it costs at the gate, and whether to take a car up yourself. It is not an inventory of the park.
The short answer
Worth a full day from 1 November to 31 May, for the ridge, not the summit. Outside those months we would spend the day somewhere else.
Two things carry the day. Kew Mae Pan is a three-kilometre walk that leaves the mossy cloud forest and comes out on open ridge with the land falling away on one side, and it is the only walk of its kind within reach of the city. The twin pagodas, minutes up the road from the trailhead, have the long view the summit does not. Everything else on the mountain is a bonus you collect because you are already up there.
The closure is what makes the calendar matter. Kew Mae Pan shuts from 1 June to 31 October so the grassland can recover, and a Doi Inthanon day without it is a long drive to a car park, two chedis and a waterfall. That is a decent half-day and a poor eleven hours.
A mountain, not a monument. Route 1009 leaves the highway at Chom Thong and climbs for about fifty kilometres, and everything worth stopping for is strung along it: a waterfall low down, the park headquarters and the village of Ban Khun Klang in the middle, the twin pagodas and the Kew Mae Pan trailhead high up, the summit at the end of the tarmac.
The mountain is high enough to change what grows on it. Towards the top the forest turns into montane cloud forest (hanging moss, tree ferns, sphagnum underfoot, water on everything), which is why the summit is dark and wet at midday, and why the ridge looks nothing like the hills behind Chiang Mai.
The summit itself is worth being plain about. It is the highest point in Thailand, at 2,565 metres, it is reached by road, and what is there is a car park, a marker, a shrine and closed forest, usually in cloud. There is no panorama, and there was never going to be one. It earns two minutes because you are already standing there, not because it is the reason to drive two hours.
Chiang Mai to the top is roughly two to two and a half hours each way, about a hundred kilometres of which the last fifty are the climb. Add the walk and the stops and you have an eleven-hour day. That is the real price of Doi Inthanon, and nothing on the mountain shortens it.
By car, driving yourself is reasonable if you are a confident driver. Route 1009 is sealed, two lanes, in decent condition and not technical. What it is, is sustained: a long continuous climb up and a long continuous descent back, tight curves, very little flat. The descent is the half that catches people out. Take a low gear and let the engine hold the car rather than riding the brakes for forty minutes, which is how brakes fade.
On two wheels, be honest about the bike you are on. The climb is the easy part; the descent is the one that asks something of you, and a small automatic scooter is a poor tool for it: next to no engine braking, and brakes never designed for forty minutes of continuous work. Riders who go up regularly go up on something with gears. If you have been riding a week in the old city, this is not the road to learn on.
The third option is to let somebody else drive. What that buys is not comfort so much as the eleven hours themselves: you sleep on the way out, the park fee and the ridge guide are usually handled for you, and nobody has to come down a mountain tired at the end of it.
About 3.2 kilometres, two to three hours at a walking pace, and a loop that returns you to the road you left. It starts in cloud forest dense enough and wet enough that the moss hangs off the branches, and then, with almost no warning, it steps out onto open grassland at the edge of the ridge with the land dropping several hundred metres on one side. That contrast is the whole point of the walk.
It is not hard. There is boardwalk over the wettest sections, the climbing is modest, and the group moves at the pace of whoever is slowest. It is exposed, though: on the open half there is no shade, no shelter and usually wind.
The season is fixed, and worth writing down exactly rather than approximately. The trail opens on 1 November. The last day it is open is 31 May. It is closed from 1 June to 31 October so the grassland can regrow. There is no discretion in this and no way around it, so a Doi Inthanon day booked for July is a different day, whatever the listing implies.
A compulsory local guide from Ban Khun Klang walks with every group, and the arrangement is simpler than it sounds. You hire one at the checkpoint on Route 1009 where the trail leaves the road (not online, not in advance): 200 THB for the group, up to ten walkers per guide. Ban Khun Klang is the Hmong village inside the park, and the rule exists partly because the ridge is exposed and easy to walk off, and substantially so that some of the money from a mountain taking a hundred thousand visitors a year stays on the mountain.
Go early. The trail starts admitting walkers around six in the morning, and the first two hours are the coldest, the clearest and the emptiest. By mid-morning in high season there is a wait at the viewing deck, and by midday the ridge has often gone into cloud.
Dress for a different country than the one at the bottom of the hill. A fleece and something windproof are the difference between a good walk and a miserable one, and in December and January you will want both while you are still standing at the trailhead.
Open
1 November to 31 May
Closed
1 June to 31 October, for regrowth
Length
About 3.2 km, a loop back to the road
Time on the trail
Two to three hours at a walking pace
Guide
A compulsory local guide from Ban Khun Klang, 200 THB per group
Group size
Ten walkers per guide at most
First walkers
The trail starts admitting walkers around 06:00
The other stops that matter
Three more places on Route 1009 earn a stop, and one well-known fourth does not belong to this day at all.
The twin pagodas
The long view the summit does not have
Two chedis on a shoulder of the mountain, built for the sixtieth birthdays of the late King and of the Queen, standing above terraced gardens kept immaculately enough to be half the reason to walk around. They are the one place up here with a long view on a clear day, and they sit minutes up the road from the Kew Mae Pan trailhead, so they cost you almost nothing in driving. There is a small separate charge on top of the national-park ticket, payable at the pagodas. The gates are usually open from about 08:00 to 16:30, and that is the one time on this page we would confirm on the day rather than plan around.
The summit, and the Ang Ka boardwalk
Two minutes, then the better ten
The marker at 2,565 metres is the photograph people come for and it takes a couple of minutes. The Ang Ka Luang boardwalk, which starts from the same car park, is the part worth staying for: a short loop on planks through the wettest, mossiest forest on the mountain, dripping and cold and unlike anything at the bottom of the hill. It is the only place up here where you walk inside the cloud forest without a guide, a permit or a season.
Wachirathan
The one waterfall worth building time for
A wide, heavy fall low on the climb, and the only one on this road we would stop for. On a strong day the spray reaches the viewing platform and you will get wet standing on it; in the afternoon the light puts a rainbow in it. Twenty minutes, taken on the way down rather than on the way up, so that the ridge gets your morning.
Mae Ya, a different approach
Not part of this itinerary
Mae Ya is often listed as a Doi Inthanon waterfall, and it is inside the park, but it is reached by its own road off the highway south of Chom Thong rather than from Route 1009. Fitting it into a ridge day means coming back down the mountain and driving out again. It belongs to a day built around it, not to this one.
The day we would actually do
One itinerary, not three. It is built around being on the ridge early and taking the waterfall on the way home, which is the reverse of the order the road offers and the reason it works.
The steps below are deliberately loose on time. The queue at the gate varies, the cloud does what it wants, and a day pinned to the minute is a day spent looking at a watch.
Out of Chiang Mai early
Before six if you can manage it. The aim is to be at the trailhead when it opens, not to bank time later on.
Straight past Wachirathan
It is the first stop the road offers and it is better later in the day. The ridge is not.
Kew Mae Pan first
Two to three hours with your guide, in the clearest and emptiest part of the morning.
The twin pagodas next
Minutes up the road from the trailhead. Give them an hour, gardens included.
Summit, then Ang Ka
Two minutes at the marker, then a slow loop of the boardwalk, which is the better half of the stop.
Wachirathan coming down
Twenty minutes. Stand close enough to get wet if the water is up.
Back in the city
Late afternoon or early evening. Eleven hours door to door is a normal day here, not a bad one.
The top of the mountain runs ten to fifteen degrees below the city, and people underestimate that every day of the year. In December and January it can be in single figures at dawn, and frost on the grass at Ang Ka is not unusual. Whatever the forecast says for Chiang Mai, pack a layer for the summit.
Cloud is the other constant. The top sits inside it more often than not, and the mountain is big enough that the ridge, the pagodas and the summit can each have their own weather in the same hour. A white morning at the trailhead is not a lost day, and a clear one at the pagodas promises nothing higher up.
By month: November to February is the best of it, cold and clear, and also the busiest and the priciest. March and April are open but hazy: the burning season turns the long views to milk, and a ridge is worth less when you cannot see off it. May is hot below and still fine up here, and it is the last of the ridge. September is the wettest month on the mountain. June to October is the closure, which settles the question.
The photographs of sunrise over a sea of cloud are real, and they are not the average morning. They need the right night and they cost you a departure at three. We would not build the day around getting one.
Everything at the gate is paid at the checkpoint on the way up, per person and per vehicle, in cash. Keep the ticket: it is checked again further up the road.
Hours are less tidy than fees, and we would rather say so than print a gate time that is wrong. The visitor-centre hours you find online are not the park's hours, the Kew Mae Pan trail starts admitting walkers around six, and most of what is on the mountain winds down through the late afternoon. Plan to be heading down before the light goes and none of it will catch you.
Tickets use the QueQ system, and in the cool-season peak booking ahead is the safer move.
The pagoda charge is collected at the pagodas rather than at the gate, and there is no card machine anywhere on the mountain. Bring more cash than the table below asks for.
Park entry, foreign adult
300 THB
Park entry, foreign child
150 THB
Park entry, Thai adult
60 THB
Park entry, Thai child or student
30 THB
Car
30 THB
Motorcycle
20 THB
Kew Mae Pan guide
200 THB per group, up to ten walkers
Twin pagodas
A small separate charge on top of the national-park ticket, payable at the pagodas
What we would skip
The rest of the waterfalls. Mae Klang, Sirithan and Siriphum are each a car park and a short walk to falling water, they are all on the same road, and once you have stood in the spray at Wachirathan a fourth one adds an hour and nothing else. A day on this mountain is not improved by collecting them.
The royal agricultural station is a working research garden with a cafe attached, and it is genuinely pleasant if gardens are your thing. On a ridge day it costs an hour you would rather have spent higher up.
The souvenir stalls at the summit, which are the same stalls as everywhere else, at altitude.
Around three hundred temples inside the city, more than thirty within the old walls alone. Nobody sees them all and nobody should try. Here are the nine that earn a place in a short stay, in the order we would visit them.
Chiang Mai is small but it is not walkable end to end. Pick the wrong side of town and you will spend your week in the back of a red truck. Here is what each neighbourhood is actually like.
Every camp around Chiang Mai now calls itself a sanctuary. The word alone tells you little. Here is what to look at instead, what your money actually pays for, and what nobody selling you a day out can honestly promise.
Four of them, not fourteen. Which one you want depends on the night of the week and on whether you came here to eat or to buy something.
Common questions
Is Doi Inthanon worth a day out of Chiang Mai?
Between 1 November and 31 May, yes. The rest of the year we would not: the ridge is what justifies the drive, and it is shut. If your dates fall inside the closure, this is the day to keep for another trip.
When exactly is the Kew Mae Pan trail open?
1 November to 31 May inclusive, and shut the rest of the year while the grassland recovers. The park stays open through the closure, which is the catch: the same day out is sold in July and in January, and only one of them includes the reason to go.
Do I have to take a guide on Kew Mae Pan?
Yes, and it is a condition of walking the trail rather than an optional extra. One guide from Ban Khun Klang takes up to ten walkers for 200 THB a group, split between however many of you there are, and you sort it at the trailhead checkpoint on the day.
What does it cost to get in?
For a foreign visitor, 300 THB an adult and 150 THB a child, plus 30 THB for a car or 20 for a motorcycle; Thai nationals pay 60 and 30. The Kew Mae Pan guide is 200 THB a group on top of that. The twin pagodas are charged separately and paid up there, not at the park gate.
Can I ride a scooter up?
You can, and on a small automatic we would not. The climb is not the difficulty. The descent is, and a scooter gives you little to slow it with beyond the brakes themselves. The people who ride this road habitually are not on scooters. If a week in the city is your whole riding history, choose a different road to add to it.
Is there a view from the summit?
No. The top is wooded and usually inside cloud, so there is nothing to look out at: the highest point in the country is a place you stand rather than a viewpoint. The views belong to the ridge and, on a clear day, to the pagodas.
