Up on the caldera rim lies a plain with towns, a railway line and rice fields – it is a volcanic basin.
In the middle sits the Kusasenri grassland, an old crater at 1,130 m (3,700 ft).
Behind it Nakadake is breathing. As of today, nobody gets to its rim.
Scroll –
from the caldera rim to the crater
The Japan Meteorological Agency has put Mount Aso at Alert Level 2 of 5 since 1 September 2026 – “do not approach the crater”. Everything within about one kilometer of the Nakadake crater is closed: the toll road, the shuttle bus, the footpath, any view of the crater. Open are the Aso-Sanjō terminal, the Kusasenri grassland and the volcano museum. To be blunt: if you are coming for the turquoise crater lake, you are coming for nothing right now.
Level 2 with a roughly one-kilometer exclusion zone has applied since 21 June 2026, interrupted by Level 3 (2 km) from 14 August to 1 September. The crater view, the crater parking lot and the Sunasenri ash desert are off limits. No date is known for a downgrade.
The city of Aso's toll road to the crater parking lot is shut, and the Sankō Bus shuttle has not run since 2 September because the road is closed. In normal operation they cost ¥1,000 per car and ¥800 per ride.
The Aso-Sanjō bus terminal has been accessible again since 2 September, as has the panorama road with the Kusasenri grassland, the horses, the Komezuka cinder cone and the Daikanbō viewpoint on the northern caldera rim.
The museum at Kusasenri projects the feed of the live camera inside the crater – currently the only legal view into it. Daily 9 am–5 pm, last entry 4:30 pm, allow 40–50 minutes.
Photo: Thomas Au · CC BY 2.0
Aso is not a single mountain but a basin 25 by 18 kilometers (16 by 11 miles), formed by four huge eruptions between 270,000 and 90,000 years ago. Inside it are towns, fields and a railway line, and in the middle five peaks – the highest is Takadake at 1,592 m (5,223 ft), the active one Nakadake at 1,506 m.
From the Daikanbō viewpoint on the northern rim you see the whole plain at once: rice fields, villages, and behind them the chain of peaks that locals call the sleeping Buddha. In autumn a sea of cloud fills it in the morning. The mountain road climbs from the town of Aso up to Kusasenri, an old crater at 1,130 m where horses graze around two ponds.
What is missing is the point of the trip: the turquoise crater lake inside Nakadake, whose fence you normally walk up to within a few dozen meters. The Aso ropeway that once ran there has been idle since 2014 and was dismantled after the earthquakes and eruption of 2016. Since September 2026 the replacement shuttle has stopped as well. Come anyway and you have Kusasenri, Komezuka, the Aso shrine and the museum – half a day, honestly counted.
Affiliate links to GetYourGuide: if you book, we earn a commission and the price stays the same. Prices and ratings as of 22 September 2026. These tours run from Fukuoka and include the crater – as long as it is open. At Alert Level 2 the drive ends at Kusasenri; whether the operator substitutes something or refunds is in their terms, not ours. Read the council's status page before you book. Prices were collected in euros.
Two bodies decide on access at Aso, independently of each other. The JMA sets the alert level for the whole mountain. The local disaster prevention council measures gas with six devices on the crater rim and closes zones or clears the rim – even at Alert Level 1. On top of that comes one rule that is not a formality.
Level 1 means the rim is open. Level 2 closes about one kilometer – crater, toll road, shuttle and Sunasenri. Level 3 closes two kilometers plus the summit trails on Nakadake and Takadake. The current status, with a timestamp, is on aso-volcano.jp.
Six automatic sensors on the rim. If readings pass the threshold, individual zones are closed or the whole rim is cleared; the shuttle then runs only as a round trip to viewing zone E (¥1,600). You see steam, but not the lake – ask before you pay.
The council bans the crater visit for people with asthma, bronchial or heart conditions and for anyone feeling unwell. The sulfur dioxide can be lethal; people died at the rim from it between 1994 and 1997. Nine concrete shelters stand along the rim.
Wardens on the rim give instructions when gas levels rise. Anyone who notices a smell, a cough or stinging eyes goes back down immediately, no questions. There is no requirement to hire a guide – and no refund if the rim closes at short notice.
| Aso-san Park Road toll, car · motorcycle ¥400 · bicycle free · disability pass ¥500 | ¥1,000 (about US$7) |
| Crater shuttle one way, adults · children ¥400 | ¥800 (about US$5.50) |
| Crater shuttle, round trip to viewing zone E under gas regulation · children ¥800 | ¥1,600 (about US$11) |
| Aso Volcano Museum, adults · elementary school ¥650 · seniors 65+ ¥1,100 · disabled 50% | ¥1,300 (about US$9) |
| Mountain bus from JR Aso Station to Kusasenri or Sanjō terminal, one way (guidebook figure) | ¥1,000 (about US$7) |
| The crater rim itself, Kusasenri, Komezuka, Daikanbō | free |
Photo: Igorberger · CC BY-SA 3.0
All three start at the Sanjō terminal at 1,130 m and end at the same fence. None of them is usable today; the figures describe normal operation at Alert Level 1.
| Toll road by car · Sanjō terminal → crater parking lot, about 5 minutes | ¥1,000 per car, ¥400 per motorcycle, bicycles free; ¥500 with a disability pass. Open 20 March to 31 October 8:30 am–6 pm (last entry 5:30 pm), in November until 5:30 pm, from 1 December to 19 March 9 am–5 pm. The barrier shuts half an hour before closing – arrive later and the drive up is wasted. |
| Sankō Bus crater shuttle · about 5 minutes each way, 32 seats | ¥800 one way, children ¥400. Timetable since 14 March 2026: 9:05 am by reservation only, then 9:45 am to 3:35 pm every 40–55 minutes. Payment in cash, by Kumamon IC card or contactless – Suica and Pasmo are not accepted here. The operator guarantees no view of the crater and refunds nothing if it closes. |
| On foot from the Sanjō terminal · 30–40 minutes to the rim, summit one hour more | Free, and only at Alert Level 1 without a gas alarm. The path runs beside the toll road. Nakadake summit (1,506 m) and Takadake (1,592 m) take another 2–4 hours over loose rock with no shade; some trails have been destroyed since the 2016 earthquakes and heavy rain, and the city of Aso points hikers to the Sarayama and Suzumeishi detours. |
| Mountain bus from JR Aso Station · 35–40 minutes to the Sanjō terminal | ¥1,000 one way to Kusasenri or Sanjō (guidebook figure; not covered by the Japan Rail Pass, but covered by the SUNQ pass). It runs to the terminal even when the crater is closed and stops at the volcano museum. After the earthquake of 28 July 2026 there were cancellations – check the operating status on the day. |
Photo: Raita Futo from Tokyo, Japan · CC BY 2.0
On 28 July 2026 at 4:27 pm a magnitude 7.1 earthquake hit Kumamoto Prefecture, reaching the maximum intensity 7 on the Japanese scale. Three days later the Aso tourism association reported no major damage to sights, accommodation or roads. Railways, buses and expressways were cut, some of them for weeks.
The Higo-Ōzu to Miyaji section was cut after the quake and reopened step by step from early August. We found no JR Kyushu statement for today's status – so look up the operating information before you go.
Kusasenri, the museum, the Aso shrine, the roadside station: the tourism association reported no major damage on 31 July 2026. The Aso shrine had already collapsed in 2016 and has been rebuilt.
On 14 and 16 April 2016 two earthquakes (Mw 6.2 and 7.0) destroyed the Great Aso Bridge, the Aso shrine and rail lines; in October an eruption sent an ash column to 11,000 m. The ropeway survived neither.
Without a car: From Kumamoto on the JR Hōhi Line to Aso (regular service about 1.5 hours, about ¥1,300; the “Aso Boy” limited express carries a surcharge). After the earthquake of 28 July 2026 the Higo-Ōzu–Miyaji section was interrupted at first and reopened step by step from early August – check JR Kyūshū's operating status before you travel. From Aso Station the Sankō mountain bus to the Sanjō terminal, about 35–40 minutes, ¥1,000. From Fukuoka: Shinkansen to Kumamoto (about 35 minutes) plus Hōhi Line, or the Kyūshū Ōdan bus (Sankō) Kumamoto–Aso–Kurokawa Onsen; the Fukuoka–Kurokawa highway bus does not stop at the Aso crater. The SUNQ Pass is valid on Sankō buses, the Japan Rail Pass is not.
By car: From the Kumamoto IC about 80 minutes: Route 57 to the junction at Aso Station, then the Bōchū-sen mountain road (Aso Tozan Dōro) up; from Ōita/Beppu about 2 hours. Large parking lots at the Sanjō terminal and at the museum/Kusasenri (Kusasenri paid, about ¥500). From Sanjō onward only via the toll road (¥1,000), when open.
Fall (October/November) with clear air, golden pampas grass on Kusasenri and a sea of clouds from Daikanbō in the early morning; spring (April/May) after the grass burning with fresh green. In summer heat and thunderstorms, in winter snow on the mountain road, shorter hours (9 am–5 pm) and winter tires. More important than the season is the day's conditions: the crater lake is most often free of steam and fog in the morning, and gas regulations cluster in calm weather and southerly winds – so come early and read the closure page the evening before. Until the level drops back to 1, the trip to the crater is not worth it anyway; Kusasenri, Daikanbō and Komezuka are always open.
Photo: Big Ben in Japan · CC BY-SA 2.0
From Kumamoto, Aso is a day trip by train and bus. If you would rather be driven, there are tours that combine the mountain with the Southern Aso Railway, Kurokawa Onsen or Kumamoto Castle. The selection is thin here: some of these have only a handful of reviews.
Affiliate links to GetYourGuide: if you book, we earn a commission and the price stays the same. Prices and ratings as of 22 September 2026. These tours cannot show the crater either at the moment. What the title says is what you book: railway, onsen, castle, grassland – not the crater rim. Prices were collected in euros.
Photo: ltsc1980 · CC BY-SA 2.0
No. As of 23 September 2026 Alert Level 2 applies, with an exclusion zone of about one kilometer around Nakadake: the toll road and shuttle are stopped, the crater view and Sunasenri are off limits. Aso-Sanjō, Kusasenri and the volcano museum are open. No date is known for a downgrade.
Level 2 of 5 (“do not approach the crater”), since 1 September 2026 at 4 pm. From 14 August to 1 September, Level 3 applied with a 2 km zone. The JMA still reports raised sulfur dioxide – 1,800 tonnes a day on 14 September – and magma collecting in a deep reservoir under Kusasenri.
As half a day, yes: the caldera view from Daikanbō, the Kusasenri grassland with its horses, Komezuka, the Aso shrine and the volcano museum with the live camera inside the crater. If the crater lake is the whole reason for the trip, wait for the downgrade to Level 1.
In normal operation: ¥1,000 per car on the toll road, or ¥800 one way on the shuttle from the Sanjō terminal, children ¥400; the rim itself is free. The volcano museum charges ¥1,300 and the mountain bus from JR Aso Station about ¥1,000 one way.
No. The disaster prevention council bans the crater visit for people with asthma, bronchial or heart conditions and for anyone feeling unwell – the sulfur dioxide can be lethal. Kusasenri and the museum are not affected.
From Kumamoto take the JR Hōhi Line to Aso, normally about 1.5 hours, then the Sankō mountain bus to the Sanjō terminal (35–40 minutes, ¥1,000). From Fukuoka take the Shinkansen to Kumamoto first, about three hours in total. By car it is roughly 80 minutes from the Kumamoto interchange on Route 57. After the earthquake of 28 July 2026, check the rail status.
No. It last ran in 2014, was damaged by the 2016 earthquakes and eruption and dismantled by 2019. Today a Sankō Bus shuttle takes five minutes from the Sanjō terminal to the crater – when the park road is open.
Yes, there is no guide requirement. At the crater rim, crater wardens give instructions, and during a gas alert everyone must get into the shelters or descend immediately. Summit hikes on Nakadake and Takadake need no guide, but Alert Level 1.
For Kusasenri, the museum and the crater rim (when open) half a day; with the trip from Kumamoto a full day trip. The walk from the Sanjō terminal to the crater takes 30–40 minutes, the Nakadake/Takadake summit loop 3–4 hours.
In normal operation, yes: car or shuttle bring everyone to the rim without effort, and there are children's fares. But toddlers react sensitively to gas, so move away at the first smell or irritation. At present the horses on Kusasenri and the live camera in the museum are the children's program.
A windproof jacket even in summer, sturdy shoes, a cloth or mask against gas and ash. In winter warm clothing and winter tires for the mountain road; hours are shorter then (9 am–5 pm).
In the open area the risk is low as long as you respect exclusion zones, gas announcements and crater wardens. The hazards are real: deaths in 1958 and 1979 from ejecta, in the 1990s from gas, and in 2026 the helicopter crash into the crater. So check the alert level and regulation stage before every visit.
On 14 and 16 April 2016 two earthquakes (Mw 6.2 and 7.0) shook the region: the Great Aso Bridge collapsed, the Aso Shrine was destroyed, railway lines were cut. On 8 October 2016 an explosive eruption of Nakadake followed with an ash column up to 11,000 m. The ropeway survived neither.
On 20 January 2026 a sightseeing helicopter crashed into the Nakadake crater; the pilot and two passengers from Taiwan are considered missing, drones spotted what were presumably the bodies in February. The recovery was halted because of Alert Level 3 in August; the wreck still lies in the crater.
Sources · accessed on 22 September 2026
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